GitHub/exynos8895/android_kernel_samsung_universal8895.git
12 years agoMerge branch 'akpm' (Andrew's patch-bomb)
Linus Torvalds [Thu, 26 Apr 2012 22:24:45 +0000 (15:24 -0700)]
Merge branch 'akpm' (Andrew's patch-bomb)

Merge fixes from Andrew Morton:
 "13 fixes.  The acerhdf patches aren't (really) fixes.  But they've
  been stuck in my tree for up to two years, sent to Matthew multiple
  times and the developers are unhappy."

* emailed from Andrew Morton <akpm@linux-foundation.org>: (13 patches)
  mm: fix NULL ptr dereference in move_pages
  mm: fix NULL ptr dereference in migrate_pages
  revert "proc: clear_refs: do not clear reserved pages"
  drivers/rtc/rtc-ds1307.c: fix BUG shown with lock debugging enabled
  arch/arm/mach-ux500/mbox-db5500.c: world-writable sysfs fifo file
  hugetlbfs: lockdep annotate root inode properly
  acerhdf: lowered default temp fanon/fanoff values
  acerhdf: add support for new hardware
  acerhdf: add support for Aspire 1410 BIOS v1.3314
  fs/buffer.c: remove BUG() in possible but rare condition
  mm: fix up the vmscan stat in vmstat
  epoll: clear the tfile_check_list on -ELOOP
  mm/hugetlb: fix warning in alloc_huge_page/dequeue_huge_page_vma

12 years agoMerge tag 'nfs-for-3.4-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Linus Torvalds [Thu, 26 Apr 2012 04:38:44 +0000 (21:38 -0700)]
Merge tag 'nfs-for-3.4-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 - Fix NFSv4 infinite loops on open(O_TRUNC)
 - Fix an Oops and an infinite loop in the NFSv4 flock code
 - Don't register the PipeFS filesystem until it has been set up
 - Fix an Oops in nfs_try_to_update_request
 - Don't reuse NFSv4 open owners: fixes a bad sequence id storm.

* tag 'nfs-for-3.4-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFSv4: Keep dropped state owners on the LRU list for a while
  NFSv4: Ensure that we don't drop a state owner more than once
  NFSv4: Ensure we do not reuse open owner names
  nfs: Enclose hostname in brackets when needed in nfs_do_root_mount
  NFS: put open context on error in nfs_flush_multi
  NFS: put open context on error in nfs_pagein_multi
  NFSv4: Fix open(O_TRUNC) and ftruncate() error handling
  NFSv4: Ensure that we check lock exclusive/shared type against open modes
  NFSv4: Ensure that the LOCK code sets exception->inode
  NFS: check for req==NULL in nfs_try_to_update_request cleanup
  SUNRPC: register PipeFS file system after pernet sybsystem

12 years agoMerge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Thu, 26 Apr 2012 04:29:26 +0000 (21:29 -0700)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from H. Peter Anvin.

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x32, siginfo: Provide proper overrides for x32 siginfo_t
  asm-generic: Allow overriding clock_t and add attributes to siginfo_t
  x32: Check __ILP32__ instead of __LP64__ for x32
  x86, acpi: Call acpi_enter_sleep_state via an asmlinkage C function from assembler
  ACPI: Convert wake_sleep_flags to a value instead of function
  x86, apic: APIC code touches invalid MSR on P5 class machines
  i387: ptrace breaks the lazy-fpu-restore logic
  x86/platform: Remove incorrect error message in x86_default_fixup_cpu_id()
  x86, efi: Add dedicated EFI stub entry point
  x86/amd: Remove broken links from comment and kernel message
  x86, microcode: Ensure that module is only loaded on supported AMD CPUs
  x86, microcode: Fix sysfs warning during module unload on unsupported CPUs

12 years agoMerge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86
Linus Torvalds [Thu, 26 Apr 2012 04:28:10 +0000 (21:28 -0700)]
Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86

Pull x86 platform driver fixes from Matthew Garrett:
 "One annoyance fix (make intel_ips stop complaining unnecessarily) and
  one oops fix (unterminated list in dell-laptop).  Both have been in
  -next for a while with no complaints."

* 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86:
  dell-laptop: Terminate quirks list properly
  intel_ips: Hush the i915 symbols message

12 years agomm: fix NULL ptr dereference in move_pages
Sasha Levin [Wed, 25 Apr 2012 23:01:53 +0000 (16:01 -0700)]
mm: fix NULL ptr dereference in move_pages

Commit 3268c63 ("mm: fix move/migrate_pages() race on task struct") has
added an odd construct where 'mm' is checked for being NULL, and if it is,
it would get dereferenced anyways by mput()ing it.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agomm: fix NULL ptr dereference in migrate_pages
Sasha Levin [Wed, 25 Apr 2012 23:01:52 +0000 (16:01 -0700)]
mm: fix NULL ptr dereference in migrate_pages

Commit 3268c63 ("mm: fix move/migrate_pages() race on task struct") has
added an odd construct where 'mm' is checked for being NULL, and if it is,
it would get dereferenced anyways by mput()ing it.

This would lead to the following NULL ptr deref and BUG() when calling
migrate_pages() with a pid that has no mm struct:

[25904.193704] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
[25904.194235] IP: [<ffffffff810b0de7>] mmput+0x27/0xf0
[25904.194235] PGD 773e6067 PUD 77da0067 PMD 0
[25904.194235] Oops: 0002 [#1] PREEMPT SMP
[25904.194235] CPU 2
[25904.194235] Pid: 31608, comm: trinity Tainted: G        W    3.4.0-rc2-next-20120412-sasha #69
[25904.194235] RIP: 0010:[<ffffffff810b0de7>]  [<ffffffff810b0de7>] mmput+0x27/0xf0
[25904.194235] RSP: 0018:ffff880077d49e08  EFLAGS: 00010202
[25904.194235] RAX: 0000000000000286 RBX: 0000000000000000 RCX: 0000000000000000
[25904.194235] RDX: ffff880075ef8000 RSI: 000000000000023d RDI: 0000000000000286
[25904.194235] RBP: ffff880077d49e18 R08: 0000000000000001 R09: 0000000000000001
[25904.194235] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[25904.194235] R13: 00000000ffffffea R14: ffff880034287740 R15: ffff8800218d3010
[25904.194235] FS:  00007fc8b244c700(0000) GS:ffff880029800000(0000) knlGS:0000000000000000
[25904.194235] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[25904.194235] CR2: 0000000000000050 CR3: 00000000767c6000 CR4: 00000000000406e0
[25904.194235] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[25904.194235] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[25904.194235] Process trinity (pid: 31608, threadinfo ffff880077d48000, task ffff880075ef8000)
[25904.194235] Stack:
[25904.194235]  ffff8800342876c0 0000000000000000 ffff880077d49f78 ffffffff811b8020
[25904.194235]  ffffffff811b7d91 ffff880075ef8000 ffff88002256d200 0000000000000000
[25904.194235]  00000000000003ff 0000000000000000 0000000000000000 0000000000000000
[25904.194235] Call Trace:
[25904.194235]  [<ffffffff811b8020>] sys_migrate_pages+0x340/0x3a0
[25904.194235]  [<ffffffff811b7d91>] ? sys_migrate_pages+0xb1/0x3a0
[25904.194235]  [<ffffffff8266cbb9>] system_call_fastpath+0x16/0x1b
[25904.194235] Code: c9 c3 66 90 55 31 d2 48 89 e5 be 3d 02 00 00 48 83 ec 10 48 89 1c 24 4c 89 64 24 08 48 89 fb 48 c7 c7 cf 0e e1 82 e8 69 18 03 00 <f0> ff 4b 50 0f 94 c0 84 c0 0f 84 aa 00 00 00 48 89 df e8 72 f1
[25904.194235] RIP  [<ffffffff810b0de7>] mmput+0x27/0xf0
[25904.194235]  RSP <ffff880077d49e08>
[25904.194235] CR2: 0000000000000050
[25904.348999] ---[ end trace a307b3ed40206b4b ]---

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agorevert "proc: clear_refs: do not clear reserved pages"
Will Deacon [Wed, 25 Apr 2012 23:01:52 +0000 (16:01 -0700)]
revert "proc: clear_refs: do not clear reserved pages"

Revert commit 85e72aa5384 ("proc: clear_refs: do not clear reserved
pages"), which was a quick fix suitable for -stable until ARM had been
moved over to the gate_vma mechanism:

https://lkml.org/lkml/2012/1/14/55

With commit f9d4861f ("ARM: 7294/1: vectors: use gate_vma for vectors user
mapping"), ARM does now use the gate_vma, so the PageReserved check can be
removed from the proc code.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Nicolas Pitre <nico@linaro.org>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agodrivers/rtc/rtc-ds1307.c: fix BUG shown with lock debugging enabled
Anatolij Gustschin [Wed, 25 Apr 2012 23:01:51 +0000 (16:01 -0700)]
drivers/rtc/rtc-ds1307.c: fix BUG shown with lock debugging enabled

Add struct bin_attribute initialization to fix the following bug:

rtc-ds1307 3-0068: rtc core: registered ds1307 as rtc0
BUG: key cfb14fcc not in .data!
------------[ cut here ]------------
WARNING: at kernel/lockdep.c:2986 sysfs_add_file_mode+0x84/0xdc()
Modules linked in:
[<c0018d94>] (unwind_backtrace+0x0/0xf8) from [<c0031f7c>] (warn_slowpath_common+0x4c/0x64)
[<c0031f7c>] (warn_slowpath_common+0x4c/0x64) from [<c0031fb0>] (warn_slowpath_null+0x1c/0x24)
[<c0031fb0>] (warn_slowpath_null+0x1c/0x24) from [<c012f7ac>] (sysfs_add_file_mode+0x84/0xdc)
[<c012f7ac>] (sysfs_add_file_mode+0x84/0xdc) from [<c04b11e4>] (ds1307_probe+0x5e4/0x6ac)
[<c04b11e4>] (ds1307_probe+0x5e4/0x6ac) from [<c036e600>] (i2c_device_probe+0xdc/0x108)
[<c036e600>] (i2c_device_probe+0xdc/0x108) from [<c02cdf84>] (driver_probe_device+0x90/0x210)
[<c02cdf84>] (driver_probe_device+0x90/0x210) from [<c02ce198>] (__driver_attach+0x94/0x98)
[<c02ce198>] (__driver_attach+0x94/0x98) from [<c02cc824>] (bus_for_each_dev+0x50/0x7c)
[<c02cc824>] (bus_for_each_dev+0x50/0x7c) from [<c02cd780>] (bus_add_driver+0x184/0x244)
[<c02cd780>] (bus_add_driver+0x184/0x244) from [<c02ce43c>] (driver_register+0x78/0x12c)
[<c02ce43c>] (driver_register+0x78/0x12c) from [<c03701ac>] (i2c_register_driver+0x2c/0xb4)
[<c03701ac>] (i2c_register_driver+0x2c/0xb4) from [<c0008798>] (do_one_initcall+0x34/0x178)
[<c0008798>] (do_one_initcall+0x34/0x178) from [<c0691860>] (kernel_init+0xdc/0x194)
[<c0691860>] (kernel_init+0xdc/0x194) from [<c0013cf0>] (kernel_thread_exit+0x0/0x8)

Since commit 6992f5334995af4 ("sysfs: Use one lockdep class per sysfs
attribute") this initialization is required.

Reported-by: Stefano Babic <sbabic@denx.de>
Tested-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoarch/arm/mach-ux500/mbox-db5500.c: world-writable sysfs fifo file
Vasiliy Kulikov [Wed, 25 Apr 2012 23:01:51 +0000 (16:01 -0700)]
arch/arm/mach-ux500/mbox-db5500.c: world-writable sysfs fifo file

Don't allow everybody to use a modem.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agohugetlbfs: lockdep annotate root inode properly
Aneesh Kumar K.V [Wed, 25 Apr 2012 23:01:50 +0000 (16:01 -0700)]
hugetlbfs: lockdep annotate root inode properly

This fixes the below reported false lockdep warning.  e096d0c7e2e4
("lockdep: Add helper function for dir vs file i_mutex annotation") added
a similar annotation for every other inode in hugetlbfs but missed the
root inode because it was allocated by a separate function.

For HugeTLB fs we allow taking i_mutex in mmap.  HugeTLB fs doesn't
support file write and its file read callback is modified in a05b0855fd
("hugetlbfs: avoid taking i_mutex from hugetlbfs_read()") to not take
i_mutex.  Hence for HugeTLB fs with regular files we really don't take
i_mutex with mmap_sem held.

 ======================================================
 [ INFO: possible circular locking dependency detected ]
 3.4.0-rc1+ #322 Not tainted
 -------------------------------------------------------
 bash/1572 is trying to acquire lock:
  (&mm->mmap_sem){++++++}, at: [<ffffffff810f1618>] might_fault+0x40/0x90

 but task is already holding lock:
  (&sb->s_type->i_mutex_key#12){+.+.+.}, at: [<ffffffff81125f88>] vfs_readdir+0x56/0xa8

 which lock already depends on the new lock.

 the existing dependency chain (in reverse order) is:

 -> #1 (&sb->s_type->i_mutex_key#12){+.+.+.}:
        [<ffffffff810a09e5>] lock_acquire+0xd5/0xfa
        [<ffffffff816a2f5e>] __mutex_lock_common+0x48/0x350
        [<ffffffff816a3325>] mutex_lock_nested+0x2a/0x31
        [<ffffffff811fb8e1>] hugetlbfs_file_mmap+0x7d/0x104
        [<ffffffff810f859a>] mmap_region+0x272/0x47d
        [<ffffffff810f8a39>] do_mmap_pgoff+0x294/0x2ee
        [<ffffffff810f8b65>] sys_mmap_pgoff+0xd2/0x10e
        [<ffffffff8103d19e>] sys_mmap+0x1d/0x1f
        [<ffffffff816a5922>] system_call_fastpath+0x16/0x1b

 -> #0 (&mm->mmap_sem){++++++}:
        [<ffffffff810a0256>] __lock_acquire+0xa81/0xd75
        [<ffffffff810a09e5>] lock_acquire+0xd5/0xfa
        [<ffffffff810f1645>] might_fault+0x6d/0x90
        [<ffffffff81125d62>] filldir+0x6a/0xc2
        [<ffffffff81133a83>] dcache_readdir+0x5c/0x222
        [<ffffffff81125fa8>] vfs_readdir+0x76/0xa8
        [<ffffffff811260b6>] sys_getdents+0x79/0xc9
        [<ffffffff816a5922>] system_call_fastpath+0x16/0x1b

 other info that might help us debug this:

  Possible unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
   lock(&sb->s_type->i_mutex_key#12);
                                lock(&mm->mmap_sem);
                                lock(&sb->s_type->i_mutex_key#12);
   lock(&mm->mmap_sem);

  *** DEADLOCK ***

 1 lock held by bash/1572:
  #0:  (&sb->s_type->i_mutex_key#12){+.+.+.}, at: [<ffffffff81125f88>] vfs_readdir+0x56/0xa8

 stack backtrace:
 Pid: 1572, comm: bash Not tainted 3.4.0-rc1+ #322
 Call Trace:
  [<ffffffff81699a3c>] print_circular_bug+0x1f8/0x209
  [<ffffffff810a0256>] __lock_acquire+0xa81/0xd75
  [<ffffffff810f38aa>] ? handle_pte_fault+0x5ff/0x614
  [<ffffffff8109e622>] ? mark_lock+0x2d/0x258
  [<ffffffff810f1618>] ? might_fault+0x40/0x90
  [<ffffffff810a09e5>] lock_acquire+0xd5/0xfa
  [<ffffffff810f1618>] ? might_fault+0x40/0x90
  [<ffffffff816a3249>] ? __mutex_lock_common+0x333/0x350
  [<ffffffff810f1645>] might_fault+0x6d/0x90
  [<ffffffff810f1618>] ? might_fault+0x40/0x90
  [<ffffffff81125d62>] filldir+0x6a/0xc2
  [<ffffffff81133a83>] dcache_readdir+0x5c/0x222
  [<ffffffff81125cf8>] ? sys_ioctl+0x74/0x74
  [<ffffffff81125cf8>] ? sys_ioctl+0x74/0x74
  [<ffffffff81125cf8>] ? sys_ioctl+0x74/0x74
  [<ffffffff81125fa8>] vfs_readdir+0x76/0xa8
  [<ffffffff811260b6>] sys_getdents+0x79/0xc9
  [<ffffffff816a5922>] system_call_fastpath+0x16/0x1b

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Josh Boyer <jwboyer@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoacerhdf: lowered default temp fanon/fanoff values
Peter Feuerer [Wed, 25 Apr 2012 23:01:49 +0000 (16:01 -0700)]
acerhdf: lowered default temp fanon/fanoff values

Due to new supported hardware, of which the actual temperature limits of
processor, harddisk and other components are unknown, it feels safer with
lower fanon / fanoff settings.

It won't change much for most people, already using acerhdf, as they use
their own fanon/fanoff variable settings when loading the module.

Furthermore seems like kernel and userspace tools have been improved to
work more efficient and netbooks don't get so hot anymore.

Signed-off-by: Peter Feuerer <peter@piie.net>
Acked-by: Borislav Petkov <petkovbb@gmail.com>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoacerhdf: add support for new hardware
Peter Feuerer [Wed, 25 Apr 2012 23:01:49 +0000 (16:01 -0700)]
acerhdf: add support for new hardware

Add support for new hardware:
Acer Aspire LT-10Q/531/751/1810/1825,
Acer Travelmate 7730,
Packard Bell ENBFT/DOTVR46

Signed-off-by: Peter Feuerer <peter@piie.net>
Acked-by: Borislav Petkov <petkovbb@gmail.com>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoacerhdf: add support for Aspire 1410 BIOS v1.3314
Clay Carpenter [Wed, 25 Apr 2012 23:01:49 +0000 (16:01 -0700)]
acerhdf: add support for Aspire 1410 BIOS v1.3314

Add support for Aspire 1410 BIOS v1.3314.  Fixes the following error:

acerhdf: unknown (unsupported) BIOS version Acer/Aspire 1410/v1.3314,
please report, aborting!

Signed-off-by: Clay Carpenter <claycarpenter@gmail.com>
Signed-off-by: Peter Feuerer <peter@piie.net>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agofs/buffer.c: remove BUG() in possible but rare condition
Glauber Costa [Wed, 25 Apr 2012 23:01:48 +0000 (16:01 -0700)]
fs/buffer.c: remove BUG() in possible but rare condition

While stressing the kernel with with failing allocations today, I hit the
following chain of events:

alloc_page_buffers():

bh = alloc_buffer_head(GFP_NOFS);
if (!bh)
goto no_grow; <= path taken

grow_dev_page():
        bh = alloc_page_buffers(page, size, 0);
        if (!bh)
                goto failed;  <= taken, consequence of the above

and then the failed path BUG()s the kernel.

The failure is inserted a litte bit artificially, but even then, I see no
reason why it should be deemed impossible in a real box.

Even though this is not a condition that we expect to see around every
time, failed allocations are expected to be handled, and BUG() sounds just
too much.  As a matter of fact, grow_dev_page() can return NULL just fine
in other circumstances, so I propose we just remove it, then.

Signed-off-by: Glauber Costa <glommer@parallels.com>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agomm: fix up the vmscan stat in vmstat
Ying Han [Wed, 25 Apr 2012 23:01:48 +0000 (16:01 -0700)]
mm: fix up the vmscan stat in vmstat

The "pgsteal" stat is confusing because it counts both direct reclaim as
well as background reclaim.  However, we have "kswapd_steal" which also
counts background reclaim value.

This patch fixes it and also makes it match the existng "pgscan_" stats.

Test:
pgsteal_kswapd_dma32 447623
pgsteal_kswapd_normal 42272677
pgsteal_kswapd_movable 0
pgsteal_direct_dma32 2801
pgsteal_direct_normal 44353270
pgsteal_direct_movable 0

Signed-off-by: Ying Han <yinghan@google.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Mel Gorman <mel@csn.ul.ie>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoepoll: clear the tfile_check_list on -ELOOP
Jason Baron [Wed, 25 Apr 2012 23:01:47 +0000 (16:01 -0700)]
epoll: clear the tfile_check_list on -ELOOP

An epoll_ctl(,EPOLL_CTL_ADD,,) operation can return '-ELOOP' to prevent
circular epoll dependencies from being created.  However, in that case we
do not properly clear the 'tfile_check_list'.  Thus, add a call to
clear_tfile_check_list() for the -ELOOP case.

Signed-off-by: Jason Baron <jbaron@redhat.com>
Reported-by: Yurij M. Plotnikov <Yurij.Plotnikov@oktetlabs.ru>
Cc: Nelson Elhage <nelhage@nelhage.com>
Cc: Davide Libenzi <davidel@xmailserver.org>
Tested-by: Alexandra N. Kossovsky <Alexandra.Kossovsky@oktetlabs.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agomm/hugetlb: fix warning in alloc_huge_page/dequeue_huge_page_vma
Konstantin Khlebnikov [Wed, 25 Apr 2012 23:01:46 +0000 (16:01 -0700)]
mm/hugetlb: fix warning in alloc_huge_page/dequeue_huge_page_vma

Fix a gcc warning (and bug?) introduced in cc9a6c877 ("cpuset: mm: reduce
large amounts of memory barrier related damage v3")

Local variable "page" can be uninitialized if the nodemask from vma policy
does not intersects with nodemask from cpuset.  Even if it doesn't happens
it is better to initialize this variable explicitly than to introduce
a kernel oops in a weird corner case.

mm/hugetlb.c: In function `alloc_huge_page':
mm/hugetlb.c:1135:5: warning: `page' may be used uninitialized in this function

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agomm: memcg: move pc lookup point to commit_charge()
Johannes Weiner [Tue, 24 Apr 2012 18:22:33 +0000 (20:22 +0200)]
mm: memcg: move pc lookup point to commit_charge()

None of the callsites actually need the page_cgroup descriptor
themselves, so just pass the page and do the look up in there.

We already had two bugs (6568d4a 'mm: memcg: update the correct soft
limit tree during migration' and 'memcg: fix Bad page state after
replace_page_cache') where the passed page and pc were not referring
to the same page frame.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agomm: nobootmem: Correct alloc_bootmem semantics.
David Miller [Wed, 25 Apr 2012 20:10:50 +0000 (16:10 -0400)]
mm: nobootmem: Correct alloc_bootmem semantics.

The comments above __alloc_bootmem_node() claim that the code will
first try the allocation using 'goal' and if that fails it will
try again but with the 'goal' requirement dropped.

Unfortunately, this is not what the code does, so fix it to do so.

This is important for nobootmem conversions to architectures such
as sparc where MAX_DMA_ADDRESS is infinity.

On such architectures all of the allocations done by generic spots,
such as the sparse-vmemmap implementation, will pass in:

__pa(MAX_DMA_ADDRESS)

as the goal, and with the limit given as "-1" this will always fail
unless we add the appropriate fallback logic here.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes
Linus Torvalds [Tue, 24 Apr 2012 15:22:25 +0000 (08:22 -0700)]
Merge git://git./linux/kernel/git/steve/gfs2-3.0-fixes

Pull gfs2 fixes from Steven Whitehouse.

* git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes:
  GFS2: Instruct DLM to avoid queue convert slowdown

12 years agoMerge tag 'hsi_fixes_for_3.4' of git://gitorious.org/kernel-hsi/kernel-hsi
Linus Torvalds [Tue, 24 Apr 2012 15:20:28 +0000 (08:20 -0700)]
Merge tag 'hsi_fixes_for_3.4' of git://gitorious.org/kernel-hsi/kernel-hsi

Pull HSI fixes and ABI documentation from Carlos Chinea

* tag 'hsi_fixes_for_3.4' of git://gitorious.org/kernel-hsi/kernel-hsi:
  HSI: Add HSI ABI documentation
  HSI: hsi_char: Remove max_data_size from sysfs
  HSI: hsi: Rework hsi_event interface
  HSI: hsi: Remove controllers and ports from the bus
  HSI: hsi: Fix error path cleanup on client registration
  HSI: hsi: Rework hsi_controller release

12 years agoGFS2: Instruct DLM to avoid queue convert slowdown
Bob Peterson [Tue, 10 Apr 2012 18:45:24 +0000 (14:45 -0400)]
GFS2: Instruct DLM to avoid queue convert slowdown

This patch instructs DLM to prevent an "in place" conversion, where the
lock just stays on the granted queue, and instead forces the conversion to
the back of the convert queue. This is done on upward conversions only.

This is useful in cases where, for example, a lock is frequently needed in
PR on one node, but another node needs it temporarily in EX to update it.
This may happen, for example, when the rindex is being updated by gfs2_grow.
The gfs2_grow needs to have the lock in EX, but the other nodes need to
re-read it to retrieve the updates. The glock is already granted in PR on
the non-growing nodes, so this prevents them from continually re-granting
the lock in PR, and forces the EX from gfs2_grow to go through.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
12 years agoMerge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
Linus Torvalds [Tue, 24 Apr 2012 02:52:00 +0000 (19:52 -0700)]
Merge tag 'ext4_for_linus' of git://git./linux/kernel/git/tytso/ext4

Pull ext4 bug fixes from Ted Ts'o:
 "These are two low-risk bug fixes for ext4, fixing a compile warning
  and a potential deadlock."

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  super.c: unused variable warning without CONFIG_QUOTA
  jbd2: use GFP_NOFS for blkdev_issue_flush

12 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rkuo/linux...
Linus Torvalds [Tue, 24 Apr 2012 02:50:48 +0000 (19:50 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/rkuo/linux-hexagon-kernel

Pull Hexagon fixes from Richard Kuo:
 "It's mostly compile fixes and the Hexagon portion of a CPU hotplug
  patch set."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rkuo/linux-hexagon-kernel:
  hexagon: add missing cpu.h include
  hexagon/CPU hotplug: Add missing call to notify_cpu_starting()
  hexagon:  use renamed tick_nohz_idle_* functions
  Hexagon: misc compile warning/error cleanup due to missing headers

12 years agoMerge branch 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
Linus Torvalds [Tue, 24 Apr 2012 02:45:19 +0000 (19:45 -0700)]
Merge branch 'rc-fixes' of git://git./linux/kernel/git/mmarek/kbuild

Pull build system failure fix from Michal Marek:
 "This fixes build failure with newer gcc that adds some internal
  symbols that end in "__mod_*_device_table", but are not actually the
  tables themselves."

* 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  Fix modpost failures in fedora 17

12 years agosuper.c: unused variable warning without CONFIG_QUOTA
Eldad Zack [Sun, 22 Apr 2012 15:50:52 +0000 (17:50 +0200)]
super.c: unused variable warning without CONFIG_QUOTA

sb info is only checked with quota support.

fs/ext4/super.c: In function ‘parse_options’:
fs/ext4/super.c:1600:23: warning: unused variable ‘sbi’ [-Wunused-variable]

Signed-off-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
12 years agojbd2: use GFP_NOFS for blkdev_issue_flush
Shaohua Li [Fri, 13 Apr 2012 02:27:35 +0000 (10:27 +0800)]
jbd2: use GFP_NOFS for blkdev_issue_flush

flush request is issued in transaction commit code path, so looks using
GFP_KERNEL to allocate memory for flush request bio falls into the classic
deadlock issue.  I saw btrfs and dm get it right, but ext4, xfs and md are
using GFP.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: stable@vger.kernel.org
12 years agoMerge tag 'md-3.4-fixes' of git://neil.brown.name/md
Linus Torvalds [Tue, 24 Apr 2012 01:25:01 +0000 (18:25 -0700)]
Merge tag 'md-3.4-fixes' of git://neil.brown.name/md

Pull a few more md bug fixes from NeilBrown:
 "2 are tagged for -stable, one being for a fairly serious bug that can
  corrupt metadata and make it hard to recovery an array.  The other is
  for a more recent regression since 3.3"

* tag 'md-3.4-fixes' of git://neil.brown.name/md:
  md: fix possible corruption of array metadata on shutdown.
  md: don't call ->add_disk unless there is good reason.
  DM RAID: Use safe version of rdev_for_each

12 years agoMerge tag 'dlm-fixes-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland...
Linus Torvalds [Tue, 24 Apr 2012 01:22:42 +0000 (18:22 -0700)]
Merge tag 'dlm-fixes-3.4' of git://git./linux/kernel/git/teigland/linux-dlm

Pull dlm fixes from David Teigland:
 "This includes one short patch fixing the behavior of the QUECVT flag,
  which the gfs2 folks are waiting on."

* tag 'dlm-fixes-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm:
  dlm: fix QUECVT when convert queue is empty

12 years agomm: fix s390 BUG by __set_page_dirty_no_writeback on swap
Hugh Dickins [Mon, 23 Apr 2012 18:14:50 +0000 (11:14 -0700)]
mm: fix s390 BUG by __set_page_dirty_no_writeback on swap

Mel reports a BUG_ON(slot == NULL) in radix_tree_tag_set() on s390
3.0.13: called from __set_page_dirty_nobuffers() when page_remove_rmap()
tries to transfer dirty flag from s390 storage key to struct page and
radix_tree.

That would be because of reclaim's shrink_page_list() calling
add_to_swap() on this page at the same time: first PageSwapCache is set
(causing page_mapping(page) to appear as &swapper_space), then
page->private set, then tree_lock taken, then page inserted into
radix_tree - so there's an interval before taking the lock when the
radix_tree slot is empty.

We could fix this by moving __add_to_swap_cache()'s spin_lock_irq up
before the SetPageSwapCache.  But a better fix is simply to do what's
five years overdue: Ken Chen introduced __set_page_dirty_no_writeback()
(if !PageDirty TestSetPageDirty) for tmpfs to skip all the radix_tree
overhead, and swap is just the same - it ignores the radix_tree tag, and
does not participate in dirty page accounting, so should be using
__set_page_dirty_no_writeback() too.

s390 testing now confirms that this does indeed fix the problem.

Reported-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Ken Chen <kenchen@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agox32, siginfo: Provide proper overrides for x32 siginfo_t
H. Peter Anvin [Mon, 23 Apr 2012 23:34:12 +0000 (16:34 -0700)]
x32, siginfo: Provide proper overrides for x32 siginfo_t

Provide the proper override macros for x32 siginfo_t.  The combination
of a special type here and an overall alignment constraint actually
ends up with all the types being properly aligned, but the hack is
needed to keep the substructures inside siginfo_t from adding padding.

Note: use __attribute__((aligned())) since __aligned() is not exported
to user space.

[ v2: fix stray semicolon ]

Reported-by: H.J. Lu <hjl.rools@gmail.com>
Cc: Bruce J. Beare <bruce.j.beare@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: http://lkml.kernel.org/r/CAMe9rOqF6Kh6-NK7oP0Fpzkd4SBAWU%2BG53hwBbSD4iA2UzyxuA@mail.gmail.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
12 years agomd: fix possible corruption of array metadata on shutdown.
NeilBrown [Tue, 24 Apr 2012 00:23:16 +0000 (10:23 +1000)]
md: fix possible corruption of array metadata on shutdown.

commit c744a65c1e2d59acc54333ce8
  md: don't set md arrays to readonly on shutdown.

removed the possibility of a 'BUG' when data is written to an array
that has just been switched to read-only, but also introduced the
possibility that the array metadata could be corrupted.

If, when md_notify_reboot gets the mddev lock, the array is
in a state where it is assembled but hasn't been started (as can
happen if the personality module is not available, or in other unusual
situations), then incorrect metadata will be written out making it
impossible to re-assemble the array.

So only call __md_stop_writes() if the array has actually been
activated.

This patch is needed for any stable kernel which has had the above
commit applied.

Cc: stable@vger.kernel.org
Reported-by: Christoph Nelles <evilazrael@evilazrael.de>
Signed-off-by: NeilBrown <neilb@suse.de>
12 years agomd: don't call ->add_disk unless there is good reason.
NeilBrown [Tue, 24 Apr 2012 00:23:14 +0000 (10:23 +1000)]
md: don't call ->add_disk unless there is good reason.

Commit 7bfec5f35c68121e7b18

   md/raid5: If there is a spare and a want_replacement device, start replacement.

cause md_check_recovery to call ->add_disk much more often.
Instead of only when the array is degraded, it is now called whenever
md_check_recovery finds anything useful to do, which includes
updating the metadata for clean<->dirty transition.
This causes unnecessary work, and causes info messages from ->add_disk
to be reported much too often.

So refine md_check_recovery to only do any actual recovery checking
(including ->add_disk) if MD_RECOVERY_NEEDED is set.

This fix is suitable for 3.3.y:

Cc: stable@vger.kernel.org
Reported-by: Jan Ceuleers <jan.ceuleers@computer.org>
Signed-off-by: NeilBrown <neilb@suse.de>
12 years agoDM RAID: Use safe version of rdev_for_each
Jonathan Brassow [Tue, 24 Apr 2012 00:23:13 +0000 (10:23 +1000)]
DM RAID: Use safe version of rdev_for_each

Fix segfault caused by using rdev_for_each instead of rdev_for_each_safe

Commit dafb20fa34320a472deb7442f25a0c086e0feb33 mistakenly replaced a safe
iterator with an unsafe one when making some macro changes.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
12 years agoasm-generic: Allow overriding clock_t and add attributes to siginfo_t
H. Peter Anvin [Mon, 23 Apr 2012 23:29:18 +0000 (16:29 -0700)]
asm-generic: Allow overriding clock_t and add attributes to siginfo_t

For the particular issue of x32, which shares code with i386 in the
handling of compat_siginfo_t, the use of a 64-bit clock_t bumps the
sigchld structure out of alignment, which triggers a messy cascade of
padding.

This was already handled on the kernel compat side, but it needs
handling on the user space side, which uses the generic header.  To
make that possible:

1. Allow __kernel_clock_t to be overridden in struct siginfo;
2. Allow there to be attributes added to struct siginfo.

Reported-by: H.J. Lu <hjl.rools@gmail.com>
Cc: Bruce J. Beare <bruce.j.beare@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: http://lkml.kernel.org/r/CAMe9rOqF6Kh6-NK7oP0Fpzkd4SBAWU%2BG53hwBbSD4iA2UzyxuA@mail.gmail.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
12 years agox32: Check __ILP32__ instead of __LP64__ for x32
H.J. Lu [Mon, 23 Apr 2012 21:51:14 +0000 (14:51 -0700)]
x32: Check __ILP32__ instead of __LP64__ for x32

Check __LP64__ isn't a reliable way to tell if we are compiling for x32
since __LP64__ isnn't specified by x86-64 psABI.  Not all x86-64
compilers define __LP64__, which was added to GCC 3.3. The updated x32
psABI:

https://sites.google.com/site/x32abi/documents

definse _ILP32 and __ILP32__ for x32.  GCC trunk and 4.7 branch have
been updated to define _ILP32 and __ILP32__ for x32.  This patch
replaces __LP64__ check with __ILP32__.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
12 years agox86, acpi: Call acpi_enter_sleep_state via an asmlinkage C function from assembler
Konrad Rzeszutek Wilk [Mon, 23 Apr 2012 03:03:18 +0000 (23:03 -0400)]
x86, acpi: Call acpi_enter_sleep_state via an asmlinkage C function from assembler

With commit a2ef5c4fd44ce3922435139393b89f2cce47f576
"ACPI: Move module parameter gts and bfs to sleep.c" the
wake_sleep_flags is required when calling acpi_enter_sleep_state.

The assembler code in wakeup_*.S did not do that. One solution
is to call it from assembler and stick the wake_sleep_flags on
the stack (for 32-bit) or in %esi (for 64-bit). hpa and rafael
both suggested however to create a wrapper function to call
acpi_enter_sleep_state and call said wrapper function
("acpi_enter_s3") from assembler.

For 32-bit, the acpi_enter_s3 ends up looking as so:

  push   %ebp
  mov    %esp,%ebp
  sub    $0x8,%esp
  movzbl 0xc1809314,%eax [wake_sleep_flags]
  movl   $0x3,(%esp)
  mov    %eax,0x4(%esp)
  call   0xc12d1fa0 <acpi_enter_sleep_state>
  leave
  ret

And 64-bit:

  movzbl 0x9afde1(%rip),%esi        [wake_sleep_flags]
  push   %rbp
  mov    $0x3,%edi
  mov    %rsp,%rbp
  callq  0xffffffff812e9800 <acpi_enter_sleep_state>
  leaveq
  retq

Reviewed-by: H. Peter Anvin <hpa@zytor.com>
Suggested-by: H. Peter Anvin <hpa@zytor.com>
[v2: Remove extra assembler operations, per hpa review]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1335150198-21899-3-git-send-email-konrad.wilk@oracle.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
12 years agoACPI: Convert wake_sleep_flags to a value instead of function
Konrad Rzeszutek Wilk [Mon, 23 Apr 2012 03:03:17 +0000 (23:03 -0400)]
ACPI: Convert wake_sleep_flags to a value instead of function

With commit a2ef5c4fd44ce3922435139393b89f2cce47f576
"ACPI: Move module parameter gts and bfs to sleep.c" the wake_sleep_flags
is required when calling acpi_enter_sleep_state, which means
that if there are functions outside the sleep.c code they
can't get the wake_sleep_flags values.

This converts the function in to a exported value and converts
the module config operands to a function.

Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Lin Ming <ming.m.lin@intel.com>
[v2: Parameters can be turned on/off dynamically]
[v3: unsigned char -> u8]
[v4: val -> kp->arg]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1335150198-21899-2-git-send-email-konrad.wilk@oracle.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
12 years agohexagon: add missing cpu.h include
Richard Kuo [Thu, 12 Apr 2012 20:57:33 +0000 (15:57 -0500)]
hexagon: add missing cpu.h include

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
12 years agohexagon/CPU hotplug: Add missing call to notify_cpu_starting()
Srivatsa S. Bhat [Thu, 22 Mar 2012 11:28:25 +0000 (16:58 +0530)]
hexagon/CPU hotplug: Add missing call to notify_cpu_starting()

The scheduler depends on receiving the CPU_STARTING notification, without
which we end up into a lot of trouble. So add the missing call to
notify_cpu_starting() in the bringup code.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
12 years agohexagon: use renamed tick_nohz_idle_* functions
Richard Kuo [Wed, 7 Mar 2012 21:27:23 +0000 (15:27 -0600)]
hexagon:  use renamed tick_nohz_idle_* functions

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
12 years agoHexagon: misc compile warning/error cleanup due to missing headers
Richard Kuo [Tue, 15 Nov 2011 22:58:11 +0000 (16:58 -0600)]
Hexagon: misc compile warning/error cleanup due to missing headers

Fixed warnings/errors for EXPORT_SYMBOL, linux_binprm, elf related
defines

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
12 years agodlm: fix QUECVT when convert queue is empty
David Teigland [Wed, 4 Apr 2012 14:49:15 +0000 (09:49 -0500)]
dlm: fix QUECVT when convert queue is empty

The QUECVT flag should not prevent conversions from
being granted immediately when the convert queue is
empty.

Signed-off-by: David Teigland <teigland@redhat.com>
12 years agoHSI: Add HSI ABI documentation
Carlos Chinea [Fri, 13 Apr 2012 12:55:13 +0000 (15:55 +0300)]
HSI: Add HSI ABI documentation

Adds sysfs HSI framework documentation

Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
12 years agoHSI: hsi_char: Remove max_data_size from sysfs
Carlos Chinea [Fri, 13 Apr 2012 13:03:03 +0000 (16:03 +0300)]
HSI: hsi_char: Remove max_data_size from sysfs

Remove max_data_size sysfs entry. Otherwise is possible
to have a buffer overrun if its value is increased after
the device is open.

Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
12 years agoHSI: hsi: Rework hsi_event interface
Carlos Chinea [Wed, 11 Apr 2012 07:55:53 +0000 (10:55 +0300)]
HSI: hsi: Rework hsi_event interface

Remove custom hack and make use of the notifier chain interfaces for
delivering events from the ports to their associated clients.
Clients that want to receive port events need to register their callbacks
using hsi_register_port_event(). The callbacks can be called in interrupt
context. Use hsi_unregestier_port_event() to undo the registration.

Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
12 years agoHSI: hsi: Remove controllers and ports from the bus
Carlos Chinea [Tue, 10 Apr 2012 12:11:24 +0000 (15:11 +0300)]
HSI: hsi: Remove controllers and ports from the bus

HSI controllers and ports do not belong to the HSI bus.
Those devices are not supposed to have a driver attached to them.

Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
12 years agoHSI: hsi: Fix error path cleanup on client registration
Carlos Chinea [Wed, 11 Apr 2012 08:01:11 +0000 (11:01 +0300)]
HSI: hsi: Fix error path cleanup on client registration

HSI client structure should be freed on error path after
calling device_registration by dropping a reference to it.

Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
12 years agoHSI: hsi: Rework hsi_controller release
Carlos Chinea [Wed, 4 Apr 2012 11:11:45 +0000 (14:11 +0300)]
HSI: hsi: Rework hsi_controller release

Use the proper release mechanism for hsi_controller and
hsi_ports structures. Free the structures through their
associated device release callbacks.

Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
12 years agoMerge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm
Linus Torvalds [Mon, 23 Apr 2012 04:19:15 +0000 (21:19 -0700)]
Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm

Pull ARM fixes from Russell King:
 "Here's my usual Sunday push, just for one revert which PeterZ hollered
  about after last weeks push.  Other than that, all seems strangely
  quiet as far as fixes go in non-platform ARM land at the moment."

* 'fixes' of git://git.linaro.org/people/rmk/linux-arm:
  Revert "ARM: 7359/2: smp_twd: Only wait for reprogramming on active cpus"

12 years agoMerge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
Linus Torvalds [Mon, 23 Apr 2012 04:07:51 +0000 (21:07 -0700)]
Merge branch 'merge' of git://git./linux/kernel/git/benh/powerpc

Pull powerpc fixes from Benjamin Herrenschmidt:
 "Here are a few fixes for powerpc.  Note the addition to the generic
  irq.h.  This is part of a 3-patches regression fix for mpic due to
  changes in how IRQ_TYPE_NONE is being handled.  Thomas agreed to the
  addition of the new IRQ_TYPE_DEFAULT contant, however he hasn't
  replied with an Ack to the actual patch yet.  I don't to wait much
  longer with these patches tho."

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc/mpic: Properly set default triggers
  irq: Add IRQ_TYPE_DEFAULT for use by PIC drivers
  powerpc/mpic: Fix confusion between hw_irq and virq
  powerpc/pmac: Don't add_timer() twice
  powerpc/eeh: Fix crash caused by null eeh_dev
  powerpc/mpc85xx: add MPIC message dts node
  powerpc/mpic_msgr: fix offset error when setting mer register
  powerpc/mpic_msgr: add lock for MPIC message global variable
  powerpc/mpic_msgr: fix compile error when SMP disabled
  powerpc: fix build when CONFIG_BOOKE_WDT is enabled
  powerpc/85xx: don't call of_platform_bus_probe() twice

12 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Linus Torvalds [Mon, 23 Apr 2012 04:02:57 +0000 (21:02 -0700)]
Merge git://git./linux/kernel/git/davem/net

Pull networking fixes from David Miller:

 1) Fix namespace init and cleanup in phonet to fix some oopses, from
    Eric W. Biederman.

 2) Missing kfree_skb() in AF_KEY, from Julia Lawall.

 3) Refcount leak and source address handling fix in l2tp from James
    Chapman.

 4) Memory leak fix in CAIF from Tomasz Gregorek.

 5) When routes are cloned from ipv6 addrconf routes, we don't process
    expirations properly.  Fix from Gao Feng.

 6) Fix panic on DMA errors in atl1 driver, from Tony Zelenoff.

 7) Only enable interrupts in 8139cp driver after we've registered the
    IRQ handler.  From Jason Wang.

 8) Fix too many reads of KS_CIDER register in ks8851 during probe,
    fixing crashes on spurious interrupts.  From Matt Renzelmann.

 9) Missing include in ath5k driver and missing iounmap on probe
    failure, from Jonathan Bither.

10) Fix RX packet handling in smsc911x driver, from Will Deacon.

11) Fix ixgbe WoL on fiber by leaving the laser on during shutdown.

12) ks8851 needs MAX_RECV_FRAMES increased otherwise the internal MAC
    buffers are easily overflown.  Fix from Davide Cimingahi.

13) Fix memory leaks in peak_usb CAN driver, from Jesper Juhl.

14) gred packet scheduler can dump in WRED more when doing a netlink
    dump.  Fix from David Ward.

15) Fix MTU in USB smsc75xx driver, from Stephane Fillod.

16) Dummy device needs ->ndo_uninit handler to properly handle
    ->ndo_init failures.  From Hiroaki SHIMODA.

17) Fix TX fragmentation in ath9k driver, from Sujith Manoharan.

18) Missing RTNL lock in ixgbe PM resume, from Benjamin Poirier.

19) Missing iounmap in farsync WAN driver, from Julia Lawall.

20) With LRO/GRO, tcp_grow_window() is easily tricked into not growing
    the receive window properly, and this hurts performance.  Fix from
    Eric Dumazet.

21) Network namespace init failure can leak net_generic data, fix from
    Julian Anastasov.

22) Fix skb_over_panic due to mis-accounting in TCP for partially ACK'd
    SKBs.  From Eric Dumazet.

23) New IDs for qmi_wwan driver, from Bjørn Mork.

24) Fix races in ax25_exit(), from Eric W. Biederman.

25) IPV6 TCP doesn't handle TCP_MAXSEG socket option properly, copy over
    logic from the IPV4 side.  From Neal Cardwell.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (59 commits)
  tcp: fix TCP_MAXSEG for established IPv6 passive sockets
  drivers/net: Do not free an IRQ if its request failed
  drop_monitor: allow more events per second
  ks8851: Fix request_irq/free_irq mismatch
  net/hyperv: Adding cancellation to ensure rndis filter is closed
  ks8851: Fix mutex deadlock in ks8851_net_stop()
  net ax25: Reorder ax25_exit to remove races.
  icplus: fix interrupt for IC+ 101A/G and 1001LF
  net: qmi_wwan: support Sierra Wireless MC77xx devices in QMI mode
  bnx2x: off by one in bnx2x_ets_e3b0_sp_pri_to_cos_set()
  ksz884x: don't copy too much in netdev_set_mac_address()
  tcp: fix retransmit of partially acked frames
  netns: do not leak net_generic data on failed init
  net/sock.h: fix sk_peek_off kernel-doc warning
  tcp: fix tcp_grow_window() for large incoming frames
  drivers/net/wan/farsync.c: add missing iounmap
  davinci_mdio: Fix MDIO timeout check
  ipv6: clean up rt6_clean_expires
  ipv6: fix rt6_update_expires
  arcnet: rimi: Fix device name in debug output
  ...

12 years agopowerpc/mpic: Properly set default triggers
Benjamin Herrenschmidt [Thu, 19 Apr 2012 17:30:57 +0000 (17:30 +0000)]
powerpc/mpic: Properly set default triggers

This gets rid of the unused default senses array, and replaces the
incorrect use of IRQ_TYPE_NONE with the new IRQ_TYPE_DEFAULT for
the initial set_trigger() call when mapping an interrupt.

This in turn makes us read the HW state and update the irq desc
accordingly.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
12 years agoirq: Add IRQ_TYPE_DEFAULT for use by PIC drivers
Benjamin Herrenschmidt [Thu, 19 Apr 2012 17:29:42 +0000 (17:29 +0000)]
irq: Add IRQ_TYPE_DEFAULT for use by PIC drivers

This is meant typically to allow a PIC driver's irq domain map() callback
to establish sane defaults for the interrupt (and make sure that the HW
and the irq_desc are in sync as far as the trigger is concerned).

The irq core may not call the set_trigger callback if it thinks the
trigger is already set to the right setting, so we need to ensure new
descriptors are properly synchronized with the hardware.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
12 years agopowerpc/mpic: Fix confusion between hw_irq and virq
Benjamin Herrenschmidt [Thu, 19 Apr 2012 17:29:34 +0000 (17:29 +0000)]
powerpc/mpic: Fix confusion between hw_irq and virq

mpic_is_ipi() takes a virq and immediately converts it to a hw_irq.

However, one of the two call sites calls it with a ... hw_irq. The
other call site also happens to have the hw_irq at hand, so let's
change it to just take that as an argument. Also change mpic_is_tm()
for consistency.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
12 years agopowerpc/pmac: Don't add_timer() twice
Benjamin Herrenschmidt [Wed, 18 Apr 2012 22:16:48 +0000 (22:16 +0000)]
powerpc/pmac: Don't add_timer() twice

If the interrupt and the timeout happen roughly at the same
time, we can get into a situation where the timer function
is run while the interrupt has already been processed. In
this case, the timer function might end up doing an add_timer
on an already pending timer, causing a BUG_ON() to trigger.

Instead, just skip the whole timeout operation if we see that
the timer is pending. The spinlock ensures that the only way
that happens is if we already started a new operation and thus
the timeout can be ignored.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
12 years agopowerpc/eeh: Fix crash caused by null eeh_dev
Gavin Shan [Mon, 16 Apr 2012 19:55:39 +0000 (19:55 +0000)]
powerpc/eeh: Fix crash caused by null eeh_dev

The problem was reported by Anton Blanchard. While EEH error
happened to the PCI device without the corresponding device
driver, kernel crash was seen. Eventually, I successfully
reproduced the problem on Firebird-L machine with utility
"errinjct". Initially, the device driver for Emulex ethernet
MAC has been disabled from .config and force data parity on
the Emulex ethernet MAC with help of "errinjct". Eventually,
I saw the kernel crash after issueing couple of "lspci -v"
command.

The root cause behind is that the PCI device, including the
reference to the corresponding eeh device, will be removed
from the system while EEH does recovery. Afterwards, the
PCI device will be probed again and added into the system
accordingly. So it's not safe to retrieve the eeh device from
the corresponding PCI device after the PCI device has been removed
and not added again.

The patch fixes the issue and retrieve the eeh device from OF node
instead of PCI device after the PCI device has been removed.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Tested-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
12 years agoMerge remote-tracking branch 'kumar/merge' into merge
Benjamin Herrenschmidt [Mon, 23 Apr 2012 00:55:20 +0000 (10:55 +1000)]
Merge remote-tracking branch 'kumar/merge' into merge

12 years agotcp: fix TCP_MAXSEG for established IPv6 passive sockets
Neal Cardwell [Sun, 22 Apr 2012 09:45:47 +0000 (09:45 +0000)]
tcp: fix TCP_MAXSEG for established IPv6 passive sockets

Commit f5fff5d forgot to fix TCP_MAXSEG behavior IPv6 sockets, so IPv6
TCP server sockets that used TCP_MAXSEG would find that the advmss of
child sockets would be incorrect. This commit mirrors the advmss logic
from tcp_v4_syn_recv_sock in tcp_v6_syn_recv_sock. Eventually this
logic should probably be shared between IPv4 and IPv6, but this at
least fixes this issue.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agoLinux 3.4-rc4
Linus Torvalds [Sat, 21 Apr 2012 21:47:52 +0000 (14:47 -0700)]
Linux 3.4-rc4

12 years agodrivers/net: Do not free an IRQ if its request failed
Lee Jones [Thu, 19 Apr 2012 10:36:33 +0000 (10:36 +0000)]
drivers/net: Do not free an IRQ if its request failed

Refrain from attempting to free an interrupt line if the request
fails and hence, there is no IRQ to free.

CC: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agosparc32,leon: add notify_cpu_starting()
Yong Zhang [Thu, 19 Apr 2012 20:28:32 +0000 (20:28 +0000)]
sparc32,leon: add notify_cpu_starting()

Otherwise cpu_active_mask will not set, which lead to other issue.

Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Signed-off-by: Konrad Eisele <konrad@gaisler.com>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agodrop_monitor: allow more events per second
Eric Dumazet [Thu, 19 Apr 2012 07:16:21 +0000 (07:16 +0000)]
drop_monitor: allow more events per second

It seems there is a logic error in trace_drop_common(), since we store
only 64 drops, even if they are from same location.

This fix is a one liner, but we probably need more work to avoid useless
atomic dec/inc

Now I can watch 1 Mpps drops through dropwatch...

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agoks8851: Fix request_irq/free_irq mismatch
Matt Renzelmann [Thu, 19 Apr 2012 07:17:17 +0000 (07:17 +0000)]
ks8851: Fix request_irq/free_irq mismatch

The dev_id parameter passed to free_irq needs to match the one passed
to the corresponding request_irq.

Signed-off-by: Matt Renzelmann <mjr@cs.wisc.edu>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agoMerge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
Linus Torvalds [Sat, 21 Apr 2012 19:45:52 +0000 (12:45 -0700)]
Merge tag 'fixes-for-linus' of git://git./linux/kernel/git/arm/arm-soc

Pull "ARM: SoC fixes" from Olof Johansson:
 * at91, ux500, imx, omap and bcmring:
  - at91 fixes for =m driver build issues, irqdomain fixes and config
    dependency fixes
  - ux500 kconfig dependency fixes and a  smp wakeup bugfix
  - imx idle bugfix and build fix due to irq domain changes
  - omap uart pinmux fixes, softreset regression revert and misc fixes
  - bcmring build error regression fix

 * ux500 and imx had some small defconfig updates in this branch

* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (27 commits)
  ARM: bcmring: fix UART declarations
  ARM: imx: Fix imx5 idle logic bug
  ARM: imx27-dt: Fix build due to removal of irq_domain_add_simple()
  ARM: imx_v4_v5_defconfig: Add support for CONFIG_REGULATOR_FIXED_VOLTAGE
  ARM: OMAP1: DMTIMER: fix broken timer clock source selection
  ARM: OMAP: serial: Fix the ocp smart idlemode handling bug
  ARM: OMAP2+: UART: Fix incorrect population of default uart pads
  ARM: OMAP: sram: fix BUG in dpll code for !PM case
  dmaengine: Kconfig: fix Atmel at_hdmac entry
  USB: gadget/at91_udc: add gpio_to_irq() function to vbus interrupt
  USB: ohci-at91: change annotations for probe/remove functions
  leds-atmel-pwm.c: Make pwmled_probe() __devinit
  ARM: at91: fix at91sam9261ek Ethernet dm9000 irq
  ARM: at91: fix rm9200ek flash size
  ARM: at91: remove empty at91_init_serial function
  ARM: at91: fix typo in at91_pmc_base assembly declaration
  ARM: at91: Export at91_matrix_base
  ARM: at91: Export at91_pmc_base
  ARM: at91: Export at91_ramc_base
  ARM: at91: Export at91_st_base
  ...

12 years agoMerge tag 'mmc-fixes-for-3.4-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 21 Apr 2012 19:44:37 +0000 (12:44 -0700)]
Merge tag 'mmc-fixes-for-3.4-rc4' of git://git./linux/kernel/git/cjb/mmc

Pull MMC fixes from Chris Ball:
 - Build fix for omap_hsmmc with OF against 3.4-rc1.
 - Fix CONFIG_MMC_UNSAFE_RESUME semantics regression against 3.3, which
   broke hotplug card detection when UNSAFE_RESUME is set.
 - Fix a race condition in omap_hsmmc with runtime PM.
 - Fix two libertas SDIO-powered-resume regressions.
 - Small fixes for discard/sanitize, dw_mmc, cd-gpio and esdhc-imx.

* tag 'mmc-fixes-for-3.4-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc:
  mmc: core: Do not pre-claim host in suspend
  mmc: dw_mmc: prevent NULL dereference for dma_ops
  mmc: unbreak sdhci-esdhc-imx on i.MX25
  mmc: cd-gpio: Include header to pickup exported symbol prototypes
  mmc: sdhci: refine non-removable card checking for card detection
  mmc: dw_mmc: Fix switch from DMA to PIO
  mmc: remove MMC bus legacy suspend/resume method
  mmc: omap_hsmmc: Get rid of of_have_populated_dt() usage
  mmc: omap_hsmmc: build fix for CONFIG_OF=y and CONFIG_MMC_OMAP_HS=m
  mmc: fixes for eMMC v4.5 sanitize operation
  mmc: fixes for eMMC v4.5 discard operation

12 years agoMerge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
Linus Torvalds [Sat, 21 Apr 2012 19:43:23 +0000 (12:43 -0700)]
Merge branch 'v4l_for_linus' of git://git./linux/kernel/git/mchehab/linux-media

Pull media fixes from Mauro Carvalho Chehab:
 - Fixes a regression at DVB core when switching from DVB-S2 to DVB-S on
   Kaffeine (Fedora 16 Bugzilla #812895);
 - Fixes a mutex unlock at an error condition at drx-k;
 - Fix winbond-cir set mode;
 - mt9m032: Fix a compilation breakage with some random Kconfig;
 - mt9m032: fix two dead locks;
 - xc5000: don't require an special firmware (that won't be provided by
   the vendor) just because the xtal frequency is different;
 - V4L DocBook: fix some typos at multi-plane formats description.

* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media:
  [media] xc5000: support 32MHz & 31.875MHz xtal using the 41.024.5 firmware
  [media] V4L: mt9m032: fix compilation breakage
  [media] V4L: DocBook: Fix typos in the multi-plane formats description
  [media] V4L: mt9m032: fix two dead-locks
  [media] rc-core: set mode for winbond-cir
  [media] drxk: Does not unlock mutex if sanity check failed in scu_command()
  [media] dvb_frontend: Fix a regression when switching back to DVB-S

12 years agoMerge tag 'mfd-for-linus-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo...
Linus Torvalds [Sat, 21 Apr 2012 19:42:12 +0000 (12:42 -0700)]
Merge tag 'mfd-for-linus-3.4' of git://git./linux/kernel/git/sameo/mfd-2.6

Pull MFD fixes from Samuel Ortiz:
 "We have 3 build fixes, a OMAP USB host PHY reset fix and the twl6040
  conversion to an i2c driver.  The latter may not sound like a fix but
  the twl6040 MFD driver won't probe without it, triggering an OMAP4
  audio regression."

* tag 'mfd-for-linus-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6:
  mfd: Fix modular builds of rc5t583 regulator support
  mfd: Fix asic3_gpio_to_irq
  ARM: OMAP3: USB: Fix the EHCI ULPI PHY reset issue
  mfd: Convert twl6040 to i2c driver, and separate it from twl core
  mfd : Fix dbx500 compilation error

12 years agonet/hyperv: Adding cancellation to ensure rndis filter is closed
Wenqi Ma [Thu, 19 Apr 2012 00:39:37 +0000 (00:39 +0000)]
net/hyperv: Adding cancellation to ensure rndis filter is closed

Although the network interface is down, the RX packets number which
could be observed by ifconfig may keep on increasing.

This is because the WORK scheduled in netvsc_set_multicast_list()
may be executed after netvsc_close(). That means the rndis filter
may be re-enabled by do_set_multicast() even if it was closed by
netvsc_close().

By canceling possible WORK before close the rndis filter, the issue
could be never happened.

Signed-off-by: Wenqi Ma <wenqi_ma@trendmicro.com.cn>
Reviewed-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agoks8851: Fix mutex deadlock in ks8851_net_stop()
Stephen Boyd [Wed, 18 Apr 2012 17:25:58 +0000 (17:25 +0000)]
ks8851: Fix mutex deadlock in ks8851_net_stop()

There is a potential deadlock scenario when the ks8851 driver
is removed. The interrupt handler schedules a workqueue which
acquires a mutex that ks8851_net_stop() also acquires before
flushing the workqueue. Previously lockdep wouldn't be able
to find this problem but now that it has the support we can
trigger this lockdep warning by rmmoding the driver after
an ifconfig up.

Fix the possible deadlock by disabling the interrupts in
the chip and then release the lock across the workqueue
flushing. The mutex is only there to proect the registers
anyway so this should be ok.

=======================================================
[ INFO: possible circular locking dependency detected ]
3.0.21-00021-g8b33780-dirty #2911
-------------------------------------------------------
rmmod/125 is trying to acquire lock:
 ((&ks->irq_work)){+.+...}, at: [<c019e0b8>] flush_work+0x0/0xac

but task is already holding lock:
 (&ks->lock){+.+...}, at: [<bf00b850>] ks8851_net_stop+0x64/0x138 [ks8851]

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #1 (&ks->lock){+.+...}:
       [<c01b89c8>] __lock_acquire+0x940/0x9f8
       [<c01b9058>] lock_acquire+0x10c/0x130
       [<c083dbec>] mutex_lock_nested+0x68/0x3dc
       [<bf00bd48>] ks8851_irq_work+0x24/0x46c [ks8851]
       [<c019c580>] process_one_work+0x2d8/0x518
       [<c019cb98>] worker_thread+0x220/0x3a0
       [<c01a2ad4>] kthread+0x88/0x94
       [<c0107008>] kernel_thread_exit+0x0/0x8

-> #0 ((&ks->irq_work)){+.+...}:
       [<c01b7984>] validate_chain+0x914/0x1018
       [<c01b89c8>] __lock_acquire+0x940/0x9f8
       [<c01b9058>] lock_acquire+0x10c/0x130
       [<c019e104>] flush_work+0x4c/0xac
       [<bf00b858>] ks8851_net_stop+0x6c/0x138 [ks8851]
       [<c06b209c>] __dev_close_many+0x98/0xcc
       [<c06b2174>] dev_close_many+0x68/0xd0
       [<c06b22ec>] rollback_registered_many+0xcc/0x2b8
       [<c06b2554>] rollback_registered+0x28/0x34
       [<c06b25b8>] unregister_netdevice_queue+0x58/0x7c
       [<c06b25f4>] unregister_netdev+0x18/0x20
       [<bf00c1f4>] ks8851_remove+0x64/0xb4 [ks8851]
       [<c049ddf0>] spi_drv_remove+0x18/0x1c
       [<c0468e98>] __device_release_driver+0x7c/0xbc
       [<c0468f64>] driver_detach+0x8c/0xb4
       [<c0467f00>] bus_remove_driver+0xb8/0xe8
       [<c01c1d20>] sys_delete_module+0x1e8/0x27c
       [<c0105ec0>] ret_fast_syscall+0x0/0x3c

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ks->lock);
                               lock((&ks->irq_work));
                               lock(&ks->lock);
  lock((&ks->irq_work));

 *** DEADLOCK ***

4 locks held by rmmod/125:
 #0:  (&__lockdep_no_validate__){+.+.+.}, at: [<c0468f44>] driver_detach+0x6c/0xb4
 #1:  (&__lockdep_no_validate__){+.+.+.}, at: [<c0468f50>] driver_detach+0x78/0xb4
 #2:  (rtnl_mutex){+.+.+.}, at: [<c06b25e8>] unregister_netdev+0xc/0x20
 #3:  (&ks->lock){+.+...}, at: [<bf00b850>] ks8851_net_stop+0x64/0x138 [ks8851]

Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agoNFSv4: Keep dropped state owners on the LRU list for a while
Trond Myklebust [Sat, 21 Apr 2012 16:36:19 +0000 (12:36 -0400)]
NFSv4: Keep dropped state owners on the LRU list for a while

To ensure that we don't reuse their identifiers.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
12 years agoNFSv4: Ensure that we don't drop a state owner more than once
Trond Myklebust [Sat, 21 Apr 2012 16:31:05 +0000 (12:31 -0400)]
NFSv4: Ensure that we don't drop a state owner more than once

Retest the RB_EMPTY_NODE() condition under the spin lock
to ensure that we don't call rb_erase() more than once on the
same state owner.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
12 years agokill mm argument of vm_munmap()
Al Viro [Sat, 21 Apr 2012 01:57:04 +0000 (21:57 -0400)]
kill mm argument of vm_munmap()

it's always current->mm

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
12 years agoperfmon: kill some helpers and arguments
Al Viro [Sat, 21 Apr 2012 01:53:35 +0000 (21:53 -0400)]
perfmon: kill some helpers and arguments

pfm_vm_munmap() is simply vm_munmap() and pfm_remove_smpl_mapping()
always get current as the first argument.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
12 years agoaio: don't bother with unmapping when aio_free_ring() is coming from exit_aio()
Al Viro [Sat, 21 Apr 2012 01:49:41 +0000 (21:49 -0400)]
aio: don't bother with unmapping when aio_free_ring() is coming from exit_aio()

... since exit_mmap() is coming and it will munmap() everything anyway.
In all other cases aio_free_ring() has ctx->mm == current->mm; moreover,
all other callers of vm_munmap() have mm == current->mm, so this will
allow us to get rid of mm argument of vm_munmap().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
12 years agoNFSv4: Ensure we do not reuse open owner names
Trond Myklebust [Fri, 20 Apr 2012 23:24:51 +0000 (19:24 -0400)]
NFSv4: Ensure we do not reuse open owner names

The NFSv4 spec is ambiguous about whether or not it is permissible
to reuse open owner names, so play it safe. This patch adds a timestamp
to the state_owner structure, and combines that with the IDA based
uniquifier.
Fixes a regression whereby the Linux server returns NFS4ERR_BAD_SEQID.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
12 years agommc: core: Do not pre-claim host in suspend
Ulf Hansson [Thu, 19 Apr 2012 09:55:25 +0000 (11:55 +0200)]
mmc: core: Do not pre-claim host in suspend

Since SDIO drivers may want to do some SDIO operations in their suspend
callback functions, we must not keep the host claimed when calling them.

Daniel Drake reported that libertas_sdio encountered a deadlock in its
suspend function.

Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com>
Tested-by: Daniel Drake <dsd@laptop.org>
[stable@: please apply to 3.2-stable and 3.3-stable]
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
12 years agommc: dw_mmc: prevent NULL dereference for dma_ops
Jaehoon Chung [Wed, 18 Apr 2012 06:42:31 +0000 (15:42 +0900)]
mmc: dw_mmc: prevent NULL dereference for dma_ops

Now, dma_ops is assumed that use the IDMAC.  But if dma_ops is assigned
the pdata->dma_ops, we didn't ensure that callback function is defined.

If the callback isn't defined, then we should run in PIO mode.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
12 years agommc: unbreak sdhci-esdhc-imx on i.MX25
Eric Bénard [Wed, 18 Apr 2012 00:30:20 +0000 (02:30 +0200)]
mmc: unbreak sdhci-esdhc-imx on i.MX25

This was broken by me in 37865fe91582582a6f6c00652f6a2b1ff71f8a78
("mmc: sdhci-esdhc-imx: fix timeout on i.MX's sdhci") where more
extensive tests would have shown that read or write of data to the
card were failing (even if the partition table was correctly read).

Signed-off-by: Eric Bénard <eric@eukrea.com>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
12 years agommc: cd-gpio: Include header to pickup exported symbol prototypes
H Hartley Sweeten [Tue, 17 Apr 2012 20:03:38 +0000 (13:03 -0700)]
mmc: cd-gpio: Include header to pickup exported symbol prototypes

Include the linux/mmc/cd-gpio.h header to pickup the prototypes
for the two exported symbols.

This quiets the sparse warnings:

warning: symbol 'mmc_cd_gpio_request' was not declared. Should it be static?
warning: symbol 'mmc_cd_gpio_free' was not declared. Should it be static?

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Venkatraman S <svenkatr@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
12 years agommc: sdhci: refine non-removable card checking for card detection
Daniel Drake [Mon, 9 Apr 2012 23:14:20 +0000 (00:14 +0100)]
mmc: sdhci: refine non-removable card checking for card detection

Commit c79396c191bc19 ("mmc: sdhci: prevent card detection activity
for non-removable cards") disables card detection where the cards
are marked as non-removable.

This makes sense, but the implementation detail of calling
mmc_card_is_removable() causes some problems, because
mmc_card_is_removable() is overloaded with CONFIG_MMC_UNSAFE_RESUME
semantics.

In the OLPC XO case, we need CONFIG_MMC_UNSAFE_RESUME because our root
filesystem is stored on SD, but we also have external SD card slots
where we want automatic card detection.

Refine the check to only apply to hosts marked as MMC_CAP_NONREMOVABLE,
which is defined to mean that the card is *really* nonremovable. This
could be revisited in future if we find a way to improve
CONFIG_MMC_UNSAFE_RESUME semantics.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
[stable@: please apply to 3.3-stable]
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
12 years agommc: dw_mmc: Fix switch from DMA to PIO
Seungwon Jeon [Tue, 10 Apr 2012 00:53:32 +0000 (09:53 +0900)]
mmc: dw_mmc: Fix switch from DMA to PIO

When dw_mci_pre_dma_transfer returns failure in some reasons,
dw_mci_submit_data will prepare to switch the PIO mode from DMA.
After switching to PIO mode, DMA(IDMAC in particular) is still
enabled. This makes the corruption in handling interrupt and
the driver lock-up.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
12 years agommc: remove MMC bus legacy suspend/resume method
Chuanxiao Dong [Wed, 11 Apr 2012 11:54:38 +0000 (19:54 +0800)]
mmc: remove MMC bus legacy suspend/resume method

MMC bus is using legacy suspend/resume method, which is not compatible if
runtime pm callbacks are used. In this scenario, MMC bus suspend/resume
callbacks cannot be called when system entering S3. So change to use the
new defined dev_pm_ops for system sleeping mode.

Tested on AM335x Platform. Solves major issue/crash reported at
http://www.mail-archive.com/linux-omap@vger.kernel.org/msg65425.html

Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Tested-by: Hebbar, Gururaja <gururaja.hebbar@ti.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Ulf Hansson <ulf.hansson@stericsson.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
12 years agoVM: add "vm_mmap()" helper function
Linus Torvalds [Sat, 21 Apr 2012 00:13:58 +0000 (17:13 -0700)]
VM: add "vm_mmap()" helper function

This continues the theme started with vm_brk() and vm_munmap():
vm_mmap() does the same thing as do_mmap(), but additionally does the
required VM locking.

This uninlines (and rewrites it to be clearer) do_mmap(), which sadly
duplicates it in mm/mmap.c and mm/nommu.c.  But that way we don't have
to export our internal do_mmap_pgoff() function.

Some day we hopefully don't have to export do_mmap() either, if all
modular users can become the simpler vm_mmap() instead.  We're actually
very close to that already, with the notable exception of the (broken)
use in i810, and a couple of stragglers in binfmt_elf.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoVM: add "vm_munmap()" helper function
Linus Torvalds [Fri, 20 Apr 2012 23:20:01 +0000 (16:20 -0700)]
VM: add "vm_munmap()" helper function

Like the vm_brk() function, this is the same as "do_munmap()", except it
does the VM locking for the caller.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agommc: omap_hsmmc: Get rid of of_have_populated_dt() usage
Rajendra Nayak [Wed, 11 Apr 2012 10:03:13 +0000 (15:33 +0530)]
mmc: omap_hsmmc: Get rid of of_have_populated_dt() usage

of_have_populated_dt() is not expected to be used in drivers but
instead only in early platform init code.
Drivers on the other hand should rely on dev->of_node or of_match_device().
Besides usage of of_have_populated_dt() also throws up build error as below
which was reported by Balaji TK, when omap_hsmmc is built as a module.

ERROR: "allnodes" [drivers/mmc/host/omap_hsmmc.ko] undefined!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2

So get rid of all of_have_populated_dt() usage in omap_hsmmc driver and
instead use dev->of_node to make the same dicisions as earlier.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Reported-by: Benoit Cousson <b-cousson@ti.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Reviewed-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
12 years agommc: omap_hsmmc: build fix for CONFIG_OF=y and CONFIG_MMC_OMAP_HS=m
Chris Ball [Tue, 10 Apr 2012 13:57:36 +0000 (09:57 -0400)]
mmc: omap_hsmmc: build fix for CONFIG_OF=y and CONFIG_MMC_OMAP_HS=m

Commit 46856a68dc ("mmc: omap_hsmmc: Convert hsmmc driver to use device tree")
introduced in 3.4-rc1 has a missing semi-colon, causing:

drivers/mmc/host/omap_hsmmc.c:1745: error: expected ',' or ';' before 'extern'

Reported-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Chris Ball <cjb@laptop.org>
12 years agommc: fixes for eMMC v4.5 sanitize operation
Adrian Hunter [Thu, 5 Apr 2012 11:45:48 +0000 (14:45 +0300)]
mmc: fixes for eMMC v4.5 sanitize operation

eMMC v4.5 sanitize operation erases all copies of unmapped
data.  However trim or erase operations must be used first
to unmap the required sectors.  That was not being done.

Fixes apply to linux 3.2 on.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: <stable@vger.kernel.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
12 years agommc: fixes for eMMC v4.5 discard operation
Adrian Hunter [Thu, 5 Apr 2012 11:45:47 +0000 (14:45 +0300)]
mmc: fixes for eMMC v4.5 discard operation

eMMC v4.5 discard operation is significantly different from the
existing trim operation because it is not guaranteed to work with
the new sanitize operation.  Consequently mmc_can_trim() is
separated from mmc_can_discard().

Also the new discard operation does not result in the sectors being
set to all-zeros, so discard_zeroes_data must not be set.

In addition, the new discard has the same timeout as trim, but from
v4.5 trim is defined to use the hc timeout.  The timeout calculation
is adjusted accordingly.

Fixes apply to linux 3.2 on.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: <stable@vger.kernel.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
12 years agoVM: add "vm_brk()" helper function
Linus Torvalds [Fri, 20 Apr 2012 22:35:40 +0000 (15:35 -0700)]
VM: add "vm_brk()" helper function

It does the same thing as "do_brk()", except it handles the VM locking
too.

It turns out that all external callers want that anyway, so we can make
do_brk() static to just mm/mmap.c while at it.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agonfs: Enclose hostname in brackets when needed in nfs_do_root_mount
Jan Kara [Fri, 2 Sep 2011 23:09:43 +0000 (01:09 +0200)]
nfs: Enclose hostname in brackets when needed in nfs_do_root_mount

When hostname contains colon (e.g. when it is an IPv6 address) it needs
to be enclosed in brackets to make parsing of NFS device string possible.
Fix nfs_do_root_mount() to enclose hostname properly when needed. NFS code
actually does not need this as it does not parse the string passed by
nfs_do_root_mount() but the device string is exposed to userspace in
/proc/mounts.

CC: Josh Boyer <jwboyer@redhat.com>
CC: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
12 years agoMerge tag 'for-torvalds-20120418' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Fri, 20 Apr 2012 19:28:06 +0000 (12:28 -0700)]
Merge tag 'for-torvalds-20120418' of git://git./linux/kernel/git/linusw/linux-pinctrl

Pull pinctrl fixes from Linus Walleij:
 - Fixed compilation errors and warnings
 - Stricter checks on the ops vtable

* tag 'for-torvalds-20120418' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
  pinctrl: implement pinctrl_check_ops
  pinctrl: include <linux/bug.h> to prevent compile errors
  pinctrl: fix compile error if not select PINMUX support

12 years agoNFS: put open context on error in nfs_flush_multi
Fred Isaman [Fri, 20 Apr 2012 18:47:35 +0000 (14:47 -0400)]
NFS: put open context on error in nfs_flush_multi

Cc: <stable@vger.kernel.org>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
12 years agoNFS: put open context on error in nfs_pagein_multi
Fred Isaman [Fri, 20 Apr 2012 18:47:34 +0000 (14:47 -0400)]
NFS: put open context on error in nfs_pagein_multi

Cc: <stable@vger.kernel.org>
Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
12 years agoMerge tag 'tty-3.4-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Linus Torvalds [Fri, 20 Apr 2012 18:40:43 +0000 (11:40 -0700)]
Merge tag 'tty-3.4-rc4' of git://git./linux/kernel/git/gregkh/tty

Pull 3 tiny tty bugfixes from Greg Kroah-Hartman.

* tag 'tty-3.4-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  drivers/tty/amiserial.c: add missing tty_unlock
  pch_uart: Fix dma channel unallocated issue
  ARM: clps711x: serial driver hungs are a result of call disable_irq within ISR

12 years agoMerge tag 'usb-3.4-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Fri, 20 Apr 2012 18:38:02 +0000 (11:38 -0700)]
Merge tag 'usb-3.4-rc4' of git://git./linux/kernel/git/gregkh/usb

Pull USB fixes from Greg Kroah-Hartman:
 "Here are a number of tiny USB fixes for 3.4-rc4.

  Most of them are in the USB gadget area, but a few other minor USB
  driver and core fixes are here as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
* tag 'usb-3.4-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (36 commits)
  USB: serial: cp210x: Fixed usb_control_msg timeout values
  USB: ehci-tegra: don't call set_irq_flags(IRQF_VALID)
  USB: yurex: Fix missing URB_NO_TRANSFER_DMA_MAP flag in urb
  USB: yurex: Remove allocation of coherent buffer for setup-packet buffer
  drivers/usb/misc/usbtest.c: add kfrees
  USB: ehci-fsl: Fix kernel crash on mpc5121e
  uwb: fix error handling
  uwb: fix use of del_timer_sync() in interrupt
  EHCI: always clear the STS_FLR status bit
  EHCI: fix criterion for resuming the root hub
  USB: sierra: avoid QMI/wwan interface on MC77xx
  usb: usbtest: avoid integer overflow in alloc_sglist()
  usb: usbtest: avoid integer overflow in test_ctrl_queue()
  USB: fix deadlock in bConfigurationValue attribute method
  usb: gadget: eliminate NULL pointer dereference (bugfix)
  usb: gadget: uvc: Remove non-required locking from 'uvc_queue_next_buffer' routine
  usb: gadget: rndis: fix Missing req->context assignment
  usb: musb: omap: fix the error check for pm_runtime_get_sync
  usb: gadget: udc-core: fix asymmetric calls in remove_driver
  usb: musb: omap: fix crash when musb glue (omap) gets initialized
  ...

12 years agoMerge tag 'stable/for-linus-3.4-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 20 Apr 2012 18:31:00 +0000 (11:31 -0700)]
Merge tag 'stable/for-linus-3.4-rc3-tag' of git://git./linux/kernel/git/konrad/xen

Pull xen fixes from Konrad Rzeszutek Wilk:
 - mechanism to work with misconfigured backends (where they are
   advertised but in reality don't exist).
 - two tiny compile warning fixes.
 - proper error handling in gnttab_resume
 - Not using VM_PFNMAP anymore to allow backends in the same domain.

* tag 'stable/for-linus-3.4-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  Revert "xen/p2m: m2p_find_override: use list_for_each_entry_safe"
  xen/resume: Fix compile warnings.
  xen/xenbus: Add quirk to deal with misconfigured backends.
  xen/blkback: Fix warning error.
  xen/p2m: m2p_find_override: use list_for_each_entry_safe
  xen/gntdev: do not set VM_PFNMAP
  xen/grant-table: add error-handling code on failure of gnttab_resume

12 years agoRevert "ACPI: ignore FADT reset-reg-sup flag"
Linus Torvalds [Fri, 20 Apr 2012 18:19:35 +0000 (11:19 -0700)]
Revert "ACPI: ignore FADT reset-reg-sup flag"

This reverts commit cf450136bfde77c7f95065c91bffded4aa7fa731.

It breaks reboot on at least one Thinkpad T43, as reported by Jörg Otte:
 "On reboot it shuts down as normal.
  The last lines displayed are:

  >Unmounting temporary filesystems.. [OK]
  >Deactivating swap...               [OK]
  >Unmounting local filesystems...    [OK]
  >Will now restart
  >    Restarting system

  Then I hear it accessing the cd-drive, but then it's being stuck."

Jörg bisected the regression to this commit.

That commit fixes another machine (see

  https://bugzilla.kernel.org/show_bug.cgi?id=11533

for details) that has a BIOS bug and doesn't support ACPI reset.
However, at least one of those other reporters no longer even has the
machine in question, and had a different workaround to begin with.
Besides, it clearly was a buggy BIOS.  Let's not break the correct case
to fix that case.

Reported-and-bisected-by: Jörg Otte <jrg.otte@googlemail.com>
Cc: linux-acpi@vger.kernel.org
Cc: Len Brown <lenb@kernel.org>
Cc: Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agomemblock: memblock should be able to handle zero length operations
Tejun Heo [Fri, 20 Apr 2012 15:31:34 +0000 (08:31 -0700)]
memblock: memblock should be able to handle zero length operations

Commit 24aa07882b ("memblock, x86: Replace memblock_x86_reserve/
free_range() with generic ones") replaced x86 specific memblock
operations with the generic ones; unfortunately, it lost zero length
operation handling in the process making the kernel panic if somebody
tries to reserve zero length area.

There isn't much to be gained by being cranky to zero length operations
and panicking is almost the worst response.  Drop the BUG_ON() in
memblock_reserve() and update memblock_add_region/isolate_range() so
that all zero length operations are handled as noops.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
Reported-by: Valere Monseur <valere.monseur@ymail.com>
Bisected-by: Joseph Freeman <jfree143dev@gmail.com>
Tested-by: Joseph Freeman <jfree143dev@gmail.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=43098
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoMerge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck...
Linus Torvalds [Fri, 20 Apr 2012 18:16:53 +0000 (11:16 -0700)]
Merge tag 'hwmon-for-linus' of git://git./linux/kernel/git/groeck/linux-staging

Pyll hwmon fixes from Guenter Roeck:
 "Two patches: Fix build warning in ads1015 driver, and fix bogus power
  values with current BIOSes in fam15h_power driver."

* tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (ads1015) Fix build warning
  hwmon: fam15h_power: fix bogus values with current BIOSes