GitHub/mt8127/android_kernel_alcatel_ttab.git
12 years agoMerge branch 'fix/asoc' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Linus Torvalds [Sat, 31 Dec 2011 19:55:06 +0000 (11:55 -0800)]
Merge branch 'fix/asoc' of git://git./linux/kernel/git/tiwai/sound

* 'fix/asoc' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ASoC: wm8776: add missing break in sample size switch

12 years agogspca: Fix falling back to lower isoc alt settings
Mauro Carvalho Chehab [Sat, 31 Dec 2011 13:32:03 +0000 (11:32 -0200)]
gspca: Fix falling back to lower isoc alt settings

The current gspca core code has a regression where it no longer properly
falls back to lower alt settings when there is not enough bandwidth.

This causes many iso based usb-1 cameras to not work when plugged into a
usb2 hub or a sandybridge chipset motherboard!

This patch fixes this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agofutex: Fix uninterruptible loop due to gate_area
Hugh Dickins [Sat, 31 Dec 2011 19:44:01 +0000 (11:44 -0800)]
futex: Fix uninterruptible loop due to gate_area

It was found (by Sasha) that if you use a futex located in the gate
area we get stuck in an uninterruptible infinite loop, much like the
ZERO_PAGE issue.

While looking at this problem, PeterZ realized you'll get into similar
trouble when hitting any install_special_pages() mapping.  And are there
still drivers setting up their own special mmaps without page->mapping,
and without special VM or pte flags to make get_user_pages fail?

In most cases, if page->mapping is NULL, we do not need to retry at all:
Linus points out that even /proc/sys/vm/drop_caches poses no problem,
because it ends up using remove_mapping(), which takes care not to
interfere when the page reference count is raised.

But there is still one case which does need a retry: if memory pressure
called shmem_writepage in between get_user_pages_fast dropping page
table lock and our acquiring page lock, then the page gets switched from
filecache to swapcache (and ->mapping set to NULL) whatever the refcount.
Fault it back in to get the page->mapping needed for key->shared.inode.

Reported-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoMerge branch 'fixes' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur...
Linus Torvalds [Fri, 30 Dec 2011 21:45:34 +0000 (13:45 -0800)]
Merge branch 'fixes' of ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm

* 'fixes' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm:
  ARM: 7237/1: PL330: Fix driver freeze
  ARM: 7197/1: errata: Remove SMP dependency for erratum 751472
  ARM: 7196/1: errata: Remove SMP dependency for erratum 720789
  ARM: 7220/1: mmc: mmci: Fixup error handling for dma
  ARM: 7214/1: mmc: mmci: Fixup handling of MCI_STARTBITERR

12 years agoMerge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Linus Torvalds [Fri, 30 Dec 2011 21:43:45 +0000 (13:43 -0800)]
Merge branch 'fixes' of git://git./linux/kernel/git/arm/arm-soc

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  ARM: plat-orion: make gpiochip label unique
  enable uncompress log on cpuimx35sd
  cpuimx35: fix touchscreen support
  cpuimx35sd: fix Kconfig
  clock-imx35: fix reboot in internal boot mode
  dma: MX3_IPU fix depends
  imx_v4_v5_defconfig: update default configuration
  cpuimx25sd: fix Kconfig
  arm/imx: fix cpufreq section mismatch
  ARM:imx:fix pwm period value
  ARM: OMAP: hwmod data: fix iva and mailbox hwmods for OMAP 3

12 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Linus Torvalds [Fri, 30 Dec 2011 21:42:41 +0000 (13:42 -0800)]
Merge branch 'for-linus' of git://git./linux/kernel/git/dtor/input

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: sentelic - fix retrieving number of buttons
  Input: sentelic - release mutex upon register write failure

12 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...
Linus Torvalds [Fri, 30 Dec 2011 21:34:22 +0000 (13:34 -0800)]
Merge branch 'for-linus' of git://git./linux/kernel/git/sage/ceph-client

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  ceph: disable use of dcache for readdir etc.

12 years agoMerge branch 'v3.2-samsung-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 30 Dec 2011 21:34:00 +0000 (13:34 -0800)]
Merge branch 'v3.2-samsung-fixes-4' of git://git./linux/kernel/git/kgene/linux-samsung

* 'v3.2-samsung-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung:
  ARM: EXYNOS: Remove duplicated SROMC static memory mapping
  ARM: SAMSUNG: Fix build error when selecting CPU_FREQ_S3C24XX_DEBUGFS on S3C2440

12 years agoRevert "clockevents: Set noop handler in clockevents_exchange_device()"
Linus Torvalds [Fri, 30 Dec 2011 21:24:40 +0000 (13:24 -0800)]
Revert "clockevents: Set noop handler in clockevents_exchange_device()"

This reverts commit de28f25e8244c7353abed8de0c7792f5f883588c.

It results in resume problems for various people. See for example

  http://thread.gmane.org/gmane.linux.kernel/1233033
  http://thread.gmane.org/gmane.linux.kernel/1233389
  http://thread.gmane.org/gmane.linux.kernel/1233159
  http://thread.gmane.org/gmane.linux.kernel/1227868/focus=1230877

and the fedora and ubuntu bug reports

  https://bugzilla.redhat.com/show_bug.cgi?id=767248
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/904569

which got bisected down to the stable version of this commit.

Reported-by: Jonathan Nieder <jrnieder@gmail.com>
Reported-by: Phil Miller <mille121@illinois.edu>
Reported-by: Philip Langdale <philipl@overt.org>
Reported-by: Tim Gardner <tim.gardner@canonical.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg KH <gregkh@suse.de>
Cc: stable@kernel.org # for stable kernels that applied the original
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoMerge git://www.linux-watchdog.org/linux-watchdog
Linus Torvalds [Fri, 30 Dec 2011 20:13:03 +0000 (12:13 -0800)]
Merge git://www.linux-watchdog.org/linux-watchdog

* git://www.linux-watchdog.org/linux-watchdog:
  watchdog: iTCO_wdt.c - problems with newer hardware due to SMI clearing (part 2)
  watchdog: hpwdt: Changes to handle NX secure bit in 32bit path
  watchdog: sp805: Fix section mismatch in ID table.
  watchdog: move coh901327 state holders

12 years agoMerge branch 'iommu/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/joro...
Linus Torvalds [Fri, 30 Dec 2011 01:36:15 +0000 (17:36 -0800)]
Merge branch 'iommu/fixes' of git://git./linux/kernel/git/joro/iommu

* 'iommu/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu: Initialize domain->handler in iommu_domain_alloc()

12 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Linus Torvalds [Fri, 30 Dec 2011 01:35:33 +0000 (17:35 -0800)]
Merge git://git./linux/kernel/git/davem/net

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
  packet: fix possible dev refcnt leak when bind fail
  netem: dont call vfree() under spinlock and BH disabled
  netfilter: ctnetlink: fix scheduling while atomic if helper is autoloaded
  netfilter: ctnetlink: fix return value of ctnetlink_get_expect()

12 years agoMerge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 30 Dec 2011 01:09:16 +0000 (17:09 -0800)]
Merge branch 'perf-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86: Fix raw_spin_unlock_irqrestore() usage
  oprofile, arm/sh: Fix oprofile_arch_exit() linkage issue

12 years agoMerge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
Linus Torvalds [Fri, 30 Dec 2011 01:05:45 +0000 (17:05 -0800)]
Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs

* 'for-linus' of git://oss.sgi.com/xfs/xfs:
  xfs: log all dirty inodes in xfs_fs_sync_fs
  xfs: log the inode in ->write_inode calls for kupdate

12 years agoMerge branch 'for-linus' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 30 Dec 2011 00:33:37 +0000 (16:33 -0800)]
Merge branch 'for-linus' of git://git.kernel.dk/linux-block

* 'for-linus' of git://git.kernel.dk/linux-block:
  block: fix blk_queue_end_tag()
  block: re-use existing 'reading' variable instead of checking direction again
  block, cfq: fix empty queue crash caused by request merge

12 years agomm: hugetlb: fix non-atomic enqueue of huge page
Hillf Danton [Wed, 28 Dec 2011 23:57:16 +0000 (15:57 -0800)]
mm: hugetlb: fix non-atomic enqueue of huge page

If a huge page is enqueued under the protection of hugetlb_lock, then the
operation is atomic and safe.

Signed-off-by: Hillf Danton <dhillf@gmail.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: <stable@vger.kernel.org> [2.6.37+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoprocfs: do not confuse jiffies with cputime64_t
Andreas Schwab [Wed, 28 Dec 2011 23:57:15 +0000 (15:57 -0800)]
procfs: do not confuse jiffies with cputime64_t

Commit 2a95ea6c0d129b4 ("procfs: do not overflow get_{idle,iowait}_time
for nohz") did not take into account that one some architectures jiffies
and cputime use different units.

This causes get_idle_time() to return numbers in the wrong units, making
the idle time fields in /proc/stat wrong.

Instead of converting the usec value returned by
get_cpu_{idle,iowait}_time_us to units of jiffies, use the new function
usecs_to_cputime64 to convert it to the correct unit of cputime64_t.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Artem S. Tashkinov" <t.artem@mailcity.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agomm/mempolicy.c: refix mbind_range() vma issue
KOSAKI Motohiro [Wed, 28 Dec 2011 23:57:11 +0000 (15:57 -0800)]
mm/mempolicy.c: refix mbind_range() vma issue

commit 8aacc9f550 ("mm/mempolicy.c: fix pgoff in mbind vma merge") is the
slightly incorrect fix.

Why? Think following case.

1. map 4 pages of a file at offset 0

   [0123]

2. map 2 pages just after the first mapping of the same file but with
   page offset 2

   [0123][23]

3. mbind() 2 pages from the first mapping at offset 2.
   mbind_range() should treat new vma is,

   [0123][23]
     |23|
     mbind vma

   but it does

   [0123][23]
     |01|
     mbind vma

   Oops. then, it makes wrong vma merge and splitting ([01][0123] or similar).

This patch fixes it.

[testcase]
  test result - before the patch

case4: 126: test failed. expect '2,4', actual '2,2,2'
        case5: passed
case6: passed
case7: passed
case8: passed
case_n: 246: test failed. expect '4,2', actual '1,4'

------------[ cut here ]------------
kernel BUG at mm/filemap.c:135!
invalid opcode: 0000 [#4] SMP DEBUG_PAGEALLOC

(snip long bug on messages)

  test result - after the patch

case4: passed
        case5: passed
case6: passed
case7: passed
case8: passed
case_n: passed

  source:  mbind_vma_test.c
============================================================
 #include <numaif.h>
 #include <numa.h>
 #include <sys/mman.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>

static unsigned long pagesize;
void* mmap_addr;
struct bitmask *nmask;
char buf[1024];
FILE *file;
char retbuf[10240] = "";
int mapped_fd;

char *rubysrc = "ruby -e '\
  pid = %d; \
  vstart = 0x%llx; \
  vend = 0x%llx; \
  s = `pmap -q #{pid}`; \
  rary = []; \
  s.each_line {|line|; \
    ary=line.split(\" \"); \
    addr = ary[0].to_i(16); \
    if(vstart <= addr && addr < vend) then \
      rary.push(ary[1].to_i()/4); \
    end; \
  }; \
  print rary.join(\",\"); \
'";

void init(void)
{
void* addr;
char buf[128];

nmask = numa_allocate_nodemask();
numa_bitmask_setbit(nmask, 0);

pagesize = getpagesize();

sprintf(buf, "%s", "mbind_vma_XXXXXX");
mapped_fd = mkstemp(buf);
if (mapped_fd == -1)
perror("mkstemp "), exit(1);
unlink(buf);

if (lseek(mapped_fd, pagesize*8, SEEK_SET) < 0)
perror("lseek "), exit(1);
if (write(mapped_fd, "\0", 1) < 0)
perror("write "), exit(1);

addr = mmap(NULL, pagesize*8, PROT_NONE,
    MAP_SHARED, mapped_fd, 0);
if (addr == MAP_FAILED)
perror("mmap "), exit(1);

if (mprotect(addr+pagesize, pagesize*6, PROT_READ|PROT_WRITE) < 0)
perror("mprotect "), exit(1);

mmap_addr = addr + pagesize;

/* make page populate */
memset(mmap_addr, 0, pagesize*6);
}

void fin(void)
{
void* addr = mmap_addr - pagesize;
munmap(addr, pagesize*8);

memset(buf, 0, sizeof(buf));
memset(retbuf, 0, sizeof(retbuf));
}

void mem_bind(int index, int len)
{
int err;

err = mbind(mmap_addr+pagesize*index, pagesize*len,
    MPOL_BIND, nmask->maskp, nmask->size, 0);
if (err)
perror("mbind "), exit(err);
}

void mem_interleave(int index, int len)
{
int err;

err = mbind(mmap_addr+pagesize*index, pagesize*len,
    MPOL_INTERLEAVE, nmask->maskp, nmask->size, 0);
if (err)
perror("mbind "), exit(err);
}

void mem_unbind(int index, int len)
{
int err;

err = mbind(mmap_addr+pagesize*index, pagesize*len,
    MPOL_DEFAULT, NULL, 0, 0);
if (err)
perror("mbind "), exit(err);
}

void Assert(char *expected, char *value, char *name, int line)
{
if (strcmp(expected, value) == 0) {
fprintf(stderr, "%s: passed\n", name);
return;
}
else {
fprintf(stderr, "%s: %d: test failed. expect '%s', actual '%s'\n",
name, line,
expected, value);
// exit(1);
}
}

/*
      AAAA
    PPPPPPNNNNNN
    might become
    PPNNNNNNNNNN
    case 4 below
*/
void case4(void)
{
init();
sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6);

mem_bind(0, 4);
mem_unbind(2, 2);

file = popen(buf, "r");
fread(retbuf, sizeof(retbuf), 1, file);
Assert("2,4", retbuf, "case4", __LINE__);

fin();
}

/*
       AAAA
 PPPPPPNNNNNN
 might become
 PPPPPPPPPPNN
 case 5 below
*/
void case5(void)
{
init();
sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6);

mem_bind(0, 2);
mem_bind(2, 2);

file = popen(buf, "r");
fread(retbuf, sizeof(retbuf), 1, file);
Assert("4,2", retbuf, "case5", __LINE__);

fin();
}

/*
    AAAA
PPPPNNNNXXXX
might become
PPPPPPPPPPPP 6
*/
void case6(void)
{
init();
sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6);

mem_bind(0, 2);
mem_bind(4, 2);
mem_bind(2, 2);

file = popen(buf, "r");
fread(retbuf, sizeof(retbuf), 1, file);
Assert("6", retbuf, "case6", __LINE__);

fin();
}

/*
    AAAA
PPPPNNNNXXXX
might become
PPPPPPPPXXXX 7
*/
void case7(void)
{
init();
sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6);

mem_bind(0, 2);
mem_interleave(4, 2);
mem_bind(2, 2);

file = popen(buf, "r");
fread(retbuf, sizeof(retbuf), 1, file);
Assert("4,2", retbuf, "case7", __LINE__);

fin();
}

/*
    AAAA
PPPPNNNNXXXX
might become
PPPPNNNNNNNN 8
*/
void case8(void)
{
init();
sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6);

mem_bind(0, 2);
mem_interleave(4, 2);
mem_interleave(2, 2);

file = popen(buf, "r");
fread(retbuf, sizeof(retbuf), 1, file);
Assert("2,4", retbuf, "case8", __LINE__);

fin();
}

void case_n(void)
{
init();
sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6);

/* make redundunt mappings [0][1234][34][7] */
mmap(mmap_addr + pagesize*4, pagesize*2, PROT_READ|PROT_WRITE,
     MAP_FIXED|MAP_SHARED, mapped_fd, pagesize*3);

/* Expect to do nothing. */
mem_unbind(2, 2);

file = popen(buf, "r");
fread(retbuf, sizeof(retbuf), 1, file);
Assert("4,2", retbuf, "case_n", __LINE__);

fin();
}

int main(int argc, char** argv)
{
case4();
case5();
case6();
case7();
case8();
case_n();

return 0;
}
=============================================================

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Caspar Zhang <caspar@casparzhang.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: <stable@vger.kernel.org> [3.1.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agogspca: Fix bulk mode cameras no longer working (regression fix)
Hans de Goede [Thu, 29 Dec 2011 21:09:21 +0000 (19:09 -0200)]
gspca: Fix bulk mode cameras no longer working (regression fix)

The new iso bandwidth calculation code accidentally has broken support
for bulk mode cameras. This has broken the following drivers:
finepix, jeilinj, ovfx2, ov534, ov534_9, se401, sq905, sq905c, sq930x,
stv0680, vicam.

Thix patch fixes this. Fix tested with: se401, sq905, sq905c, stv0680 & vicam
cams.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoInput: sentelic - fix retrieving number of buttons
Tai-hwa Liang [Thu, 29 Dec 2011 17:47:36 +0000 (09:47 -0800)]
Input: sentelic - fix retrieving number of buttons

Fixing wrong register offset which is used to retrieve the number of buttons
attached to the hardware.

Signed-off-by: Tai-hwa Liang <avatar@sentelic.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
12 years agoceph: disable use of dcache for readdir etc.
Sage Weil [Thu, 29 Dec 2011 16:05:14 +0000 (08:05 -0800)]
ceph: disable use of dcache for readdir etc.

Ceph attempts to use the dcache to satisfy negative lookups and readdir
when the entire directory contents are in cache.  Disable this behavior
until lingering bugs in this code are shaken out; we'll re-enable these
hooks once things are fully stable.

Signed-off-by: Sage Weil <sage@newdream.net>
12 years agoblock: fix blk_queue_end_tag()
Dan Williams [Thu, 29 Dec 2011 08:16:28 +0000 (09:16 +0100)]
block: fix blk_queue_end_tag()

Commit 5e081591 "block: warn if tag is greater than real_max_depth"
cleaned up blk_queue_end_tag() to warn when the tag is truly invalid
(greater than real_max_depth).  However, it changed behavior in the tag <
max_depth case to not end the request.  Leading to triggering of
BUG_ON(blk_queued_rq(rq)) in the request completion path:

  http://marc.info/?l=linux-kernel&m=132204370518629&w=2

In order to allow blk_queue_resize_tags() to shrink the tag space
blk_queue_end_tag() must always complete tags with a value less than
real_max_depth regardless of the current max_depth.  The comment about
"handling the shrink case" seems to be what prompted changes in this
space, so remove it and BUG on all invalid tags (made even simpler by
Matthew's suggestion to use an unsigned compare).

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Tao Ma <boyu.mt@taobao.com>
Cc: Matthew Wilcox <matthew@wil.cx>
Reported-by: Meelis Roos <mroos@ut.ee>
Reported-by: Ed Nadolski <edmund.nadolski@intel.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
12 years agoARM: EXYNOS: Remove duplicated SROMC static memory mapping
Thomas Abraham [Wed, 28 Dec 2011 06:07:32 +0000 (15:07 +0900)]
ARM: EXYNOS: Remove duplicated SROMC static memory mapping

SROMC static memory mapping is included in the common s5p initialization
code. Hence, remove the duplicated SROMC static memory mapping for EXYNOS.

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Cc: stable@kernel.org
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
12 years agoARM: SAMSUNG: Fix build error when selecting CPU_FREQ_S3C24XX_DEBUGFS on S3C2440
Denis Kuzmenko [Wed, 28 Dec 2011 05:04:51 +0000 (14:04 +0900)]
ARM: SAMSUNG: Fix build error when selecting CPU_FREQ_S3C24XX_DEBUGFS on S3C2440

Following is happened when CONFIG_CPU_FREQ_S3C24XX_DEBUGFS
is selected without building of s3c2410-iotiming.c file:

arch/arm/mach-s3c2440/built-in.o:(.data+0x38c): undefined reference to `s3c2410_iotiming_debugfs

Basically, the CONFIG_S3C2410_IOTIMING is not selected for
MACH_MINI2440. Because the s3c2410-iotiming.c is not ever
compiled and enabling CONFIG_CPU_FREQ_S3C24XX_DEBUGFS option
caused undefined reference to s3c2410_iotiming_debugfs()
defined in that file.  The s3c2410_iotiming_debugfs defined
as NULL for this case.

Signed-off-by: Denis Kuzmenko <linux@solonet.org.ua>
Cc: stable@kernel.org
[kgene.kim@samsung.com: removed useless changes]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
12 years agopacket: fix possible dev refcnt leak when bind fail
Wei Yongjun [Wed, 28 Dec 2011 03:32:41 +0000 (22:32 -0500)]
packet: fix possible dev refcnt leak when bind fail

If bind is fail when bind is called after set PACKET_FANOUT
sock option, the dev refcnt will leak.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agowatchdog: iTCO_wdt.c - problems with newer hardware due to SMI clearing (part 2)
Wim Van Sebroeck [Mon, 26 Dec 2011 14:23:51 +0000 (15:23 +0100)]
watchdog: iTCO_wdt.c - problems with newer hardware due to SMI clearing (part 2)

Redhat Bugzilla: Bug 727875 - TCO_EN bit is disabled by TCO driver

The previous patch breaks reset watchdog behaviour on the older hardware.
It is therefor better to make sure that the behaviour for older hardware (<=ICH5 or
6300ESB) is preserved and that the behaviour for newer hardware is changed.
We therefor use the iTCO_version to see if we need the clearing of the SMI_TCO_EN
bit in the SMI_EN register.

So the new behaviour becomes:
turn_SMI_watchdog_clear_off=0 -> Do not turn off SMI clearing watchdog.
turn_SMI_watchdog_clear_off=1 -> Turn off SMI clearing watchdog when iTCO_version=1
 (ICHO till ICH5 + 6300ESB only)
turn_SMI_watchdog_clear_off=2 -> Turn off SMI clearing watchdog.

Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
12 years agodrm/i915: Disable RC6 on Sandybridge by default
Keith Packard [Tue, 27 Dec 2011 01:02:11 +0000 (17:02 -0800)]
drm/i915: Disable RC6 on Sandybridge by default

RC6 fails again.

> I found my system freeze mostly during starting up X and KDE. Sometimes it
> works for some minutes, sometimes it freezes immediatly. When the freeze
> happens, everything is dead (even the reset button does not work, I need to
> power cycle).

> I disabled RC6, and my system runs wonderfully.

> The system is a Z68 Pro board with Sandybridge i5-2500K processor, 8
> GB of RAM and UEFI firmware.

Reported-by: Kai Krakow <hurikhan77@gmail.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agodrm/i915: Disable semaphores by default on SNB
Keith Packard [Tue, 27 Dec 2011 01:02:10 +0000 (17:02 -0800)]
drm/i915: Disable semaphores by default on SNB

Semaphores still cause problems on some machines:

> From Udo Steinberg:
>
> With Linux-3.2-rc6 I'm frequently seeing GPU hangs when large amounts of
> text scroll in an xterm, such as when extracting a tar archive. Such as this
> one (note the timestamps):
>
>  I can reproduce it fairly easily with something
>  as simple as:
>
>   while true; do dmesg; done

This patch turns them off on SNB while leaving them on for IVB.

Reported-by: Udo Steinberg <udo@hypervisor.org>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Eugeni Dodonov <eugeni@dodonov.net>
Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoMerge branch 'kvm-updates/3.2' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Mon, 26 Dec 2011 21:17:00 +0000 (13:17 -0800)]
Merge branch 'kvm-updates/3.2' of git://git./virt/kvm/kvm

* 'kvm-updates/3.2' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: PPC: e500: include linux/export.h
  KVM: PPC: fix kvmppc_start_thread() for CONFIG_SMP=N
  KVM: PPC: protect use of kvmppc_h_pr
  KVM: PPC: move compute_tlbie_rb to book3s_64 common header
  KVM: Don't automatically expose the TSC deadline timer in cpuid
  KVM: Device assignment permission checks
  KVM: Remove ability to assign a device without iommu support
  KVM: x86: Prevent starting PIT timers in the absence of irqchip support

12 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394
Linus Torvalds [Mon, 26 Dec 2011 20:46:17 +0000 (12:46 -0800)]
Merge tag 'for-linus' of git://git./linux/kernel/git/ieee1394/linux1394

post 3.2-rc7 pull request

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394:
  MAINTAINERS: firewire git URL update

12 years agovfs: fix handling of lock allocation failure in lease-break case
Linus Torvalds [Mon, 26 Dec 2011 18:25:26 +0000 (10:25 -0800)]
vfs: fix handling of lock allocation failure in lease-break case

Bruce Fields notes that commit 778fc546f749 ("locks: fix tracking of
inprogress lease breaks") introduced a possible error pointer
dereference on failure to allocate memory.  locks_conflict() will
dereference the passed-in new lease lock structure that may be an error pointer.

This means an open (without O_NONBLOCK set) on a file with a lease
applied (generally only done when Samba or nfsd (with v4) is running)
could crash if a kmalloc() fails.

So instead of playing games with IS_ERROR() all over the place, just
check the allocation failure early.  That makes the code more
straightforward, and avoids this possible bad pointer dereference.

Based-on-patch-by: J. Bruce Fields <bfields@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agowatchdog: hpwdt: Changes to handle NX secure bit in 32bit path
Mingarelli, Thomas [Mon, 7 Nov 2011 09:59:00 +0000 (10:59 +0100)]
watchdog: hpwdt: Changes to handle NX secure bit in 32bit path

This patch makes use of the set_memory_x() kernel API in order
to make necessary BIOS calls to source NMIs.

This is needed for SLES11 SP2 and the latest upstream kernel as it appears
the NX Execute Disable has grown in its control.

Signed-off by: Thomas Mingarelli <thomas.mingarelli@hp.com>
Signed-off by: Wim Van Sebroeck <wim@iguana.be>
Cc: stable@kernel.org
12 years agowatchdog: sp805: Fix section mismatch in ID table.
Nick Bowler [Mon, 19 Dec 2011 16:22:36 +0000 (11:22 -0500)]
watchdog: sp805: Fix section mismatch in ID table.

The AMBA ID table is marked as __initdata, yet it is referenced by the
driver struct which is not.  This causes a (somewhat unhelpful) section
mismatch warning:

  WARNING: drivers/watchdog/sp805_wdt.o(.data+0x4c): Section mismatch in
           reference from the variable sp805_wdt_driver to the (unknown
           reference) .init.data:(unknown)

Fix this by removing the annotation.

Signed-off-by: Nick Bowler <nbowler@elliptictech.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
12 years agowatchdog: move coh901327 state holders
Linus Walleij [Mon, 3 Oct 2011 08:52:58 +0000 (10:52 +0200)]
watchdog: move coh901327 state holders

The state holders used in the PM path of the drivers report as
unused variables when compiling without CONFIG_PM so let's
move them inside CONFIG_PM.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
12 years agoKVM: PPC: e500: include linux/export.h
Scott Wood [Tue, 20 Dec 2011 14:43:45 +0000 (14:43 +0000)]
KVM: PPC: e500: include linux/export.h

This is required for THIS_MODULE.  We recently stopped acquiring
it via some other header.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
12 years agoKVM: PPC: fix kvmppc_start_thread() for CONFIG_SMP=N
Michael Neuling [Thu, 10 Nov 2011 16:03:20 +0000 (16:03 +0000)]
KVM: PPC: fix kvmppc_start_thread() for CONFIG_SMP=N

Currently kvmppc_start_thread() tries to wake other SMT threads via
xics_wake_cpu().  Unfortunately xics_wake_cpu only exists when
CONFIG_SMP=Y so when compiling with CONFIG_SMP=N we get:

  arch/powerpc/kvm/built-in.o: In function `.kvmppc_start_thread':
  book3s_hv.c:(.text+0xa1e0): undefined reference to `.xics_wake_cpu'

The following should be fine since kvmppc_start_thread() shouldn't
called to start non-zero threads when SMP=N since threads_per_core=1.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
12 years agoKVM: PPC: protect use of kvmppc_h_pr
Andreas Schwab [Tue, 8 Nov 2011 07:17:39 +0000 (07:17 +0000)]
KVM: PPC: protect use of kvmppc_h_pr

kvmppc_h_pr is only available if CONFIG_KVM_BOOK3S_64_PR.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
12 years agoKVM: PPC: move compute_tlbie_rb to book3s_64 common header
Andreas Schwab [Tue, 8 Nov 2011 07:08:52 +0000 (07:08 +0000)]
KVM: PPC: move compute_tlbie_rb to book3s_64 common header

compute_tlbie_rb is only used on ppc64 and cannot be compiled on ppc32.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
12 years agoKVM: Don't automatically expose the TSC deadline timer in cpuid
Jan Kiszka [Wed, 21 Dec 2011 11:28:29 +0000 (12:28 +0100)]
KVM: Don't automatically expose the TSC deadline timer in cpuid

Unlike all of the other cpuid bits, the TSC deadline timer bit is set
unconditionally, regardless of what userspace wants.

This is broken in several ways:
 - if userspace doesn't use KVM_CREATE_IRQCHIP, and doesn't emulate the TSC
   deadline timer feature, a guest that uses the feature will break
 - live migration to older host kernels that don't support the TSC deadline
   timer will cause the feature to be pulled from under the guest's feet;
   breaking it
 - guests that are broken wrt the feature will fail.

Fix by not enabling the feature automatically; instead report it to userspace.
Because the feature depends on KVM_CREATE_IRQCHIP, which we cannot guarantee
will be called, we expose it via a KVM_CAP_TSC_DEADLINE_TIMER and not
KVM_GET_SUPPORTED_CPUID.

Fixes the Illumos guest kernel, which uses the TSC deadline timer feature.

[avi: add the KVM_CAP + documentation]

Reported-by: Alexey Zaytsev <alexey.zaytsev@gmail.com>
Tested-by: Alexey Zaytsev <alexey.zaytsev@gmail.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
12 years agoKVM: Device assignment permission checks
Alex Williamson [Wed, 21 Dec 2011 04:59:09 +0000 (21:59 -0700)]
KVM: Device assignment permission checks

Only allow KVM device assignment to attach to devices which:

 - Are not bridges
 - Have BAR resources (assume others are special devices)
 - The user has permissions to use

Assigning a bridge is a configuration error, it's not supported, and
typically doesn't result in the behavior the user is expecting anyway.
Devices without BAR resources are typically chipset components that
also don't have host drivers.  We don't want users to hold such devices
captive or cause system problems by fencing them off into an iommu
domain.  We determine "permission to use" by testing whether the user
has access to the PCI sysfs resource files.  By default a normal user
will not have access to these files, so it provides a good indication
that an administration agent has granted the user access to the device.

[Yang Bai: add missing #include]
[avi: fix comment style]

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Yang Bai <hamo.by@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
12 years agoKVM: Remove ability to assign a device without iommu support
Alex Williamson [Wed, 21 Dec 2011 04:59:03 +0000 (21:59 -0700)]
KVM: Remove ability to assign a device without iommu support

This option has no users and it exposes a security hole that we
can allow devices to be assigned without iommu protection.  Make
KVM_DEV_ASSIGN_ENABLE_IOMMU a mandatory option.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
12 years agoKVM: x86: Prevent starting PIT timers in the absence of irqchip support
Jan Kiszka [Wed, 14 Dec 2011 18:25:13 +0000 (19:25 +0100)]
KVM: x86: Prevent starting PIT timers in the absence of irqchip support

User space may create the PIT and forgets about setting up the irqchips.
In that case, firing PIT IRQs will crash the host:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000128
IP: [<ffffffffa10f6280>] kvm_set_irq+0x30/0x170 [kvm]
...
Call Trace:
 [<ffffffffa11228c1>] pit_do_work+0x51/0xd0 [kvm]
 [<ffffffff81071431>] process_one_work+0x111/0x4d0
 [<ffffffff81071bb2>] worker_thread+0x152/0x340
 [<ffffffff81075c8e>] kthread+0x7e/0x90
 [<ffffffff815a4474>] kernel_thread_helper+0x4/0x10

Prevent this by checking the irqchip mode before starting a timer. We
can't deny creating the PIT if the irqchips aren't set up yet as
current user land expects this order to work.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
12 years agoMAINTAINERS: firewire git URL update
Stefan Richter [Tue, 20 Dec 2011 20:23:28 +0000 (21:23 +0100)]
MAINTAINERS: firewire git URL update

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
12 years agoMerge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
Linus Torvalds [Sat, 24 Dec 2011 21:34:44 +0000 (13:34 -0800)]
Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux

* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
  vmwgfx: fix incorrect VRAM size check in vmw_kms_fb_create()
  drm/radeon/kms: bail on BTC parts if MC ucode is missing

12 years agoMerge branch 'nf' of git://1984.lsi.us.es/net
David S. Miller [Sat, 24 Dec 2011 21:10:26 +0000 (16:10 -0500)]
Merge branch 'nf' of git://1984.lsi.us.es/net

12 years agonetem: dont call vfree() under spinlock and BH disabled
Eric Dumazet [Fri, 23 Dec 2011 19:28:51 +0000 (19:28 +0000)]
netem: dont call vfree() under spinlock and BH disabled

commit 6373a9a286 (netem: use vmalloc for distribution table) added a
regression, since vfree() is called while holding a spinlock and BH
being disabled.

Fix this by doing the pointers swap in critical section, and freeing
after spinlock release.

Also add __GFP_NOWARN to the kmalloc() try, since we fallback to
vmalloc().

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agonetfilter: ctnetlink: fix scheduling while atomic if helper is autoloaded
Pablo Neira Ayuso [Sat, 24 Dec 2011 18:28:47 +0000 (19:28 +0100)]
netfilter: ctnetlink: fix scheduling while atomic if helper is autoloaded

This patch fixes one scheduling while atomic error:

[  385.565186] ctnetlink v0.93: registering with nfnetlink.
[  385.565349] BUG: scheduling while atomic: lt-expect_creat/16163/0x00000200

It can be triggered with utils/expect_create included in
libnetfilter_conntrack if the FTP helper is not loaded.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
12 years agonetfilter: ctnetlink: fix return value of ctnetlink_get_expect()
Pablo Neira Ayuso [Sat, 24 Dec 2011 18:03:46 +0000 (19:03 +0100)]
netfilter: ctnetlink: fix return value of ctnetlink_get_expect()

This fixes one bogus error that is returned to user-space:

libnetfilter_conntrack/utils# ./expect_get
TEST: get expectation (-1)(Unknown error 18446744073709551504)

This patch includes the correct handling for EAGAIN (nfnetlink
uses this error value to restart the operation after module
auto-loading).

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
12 years agoLinux 3.2-rc7
Linus Torvalds [Sat, 24 Dec 2011 05:51:06 +0000 (21:51 -0800)]
Linux 3.2-rc7

12 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Linus Torvalds [Sat, 24 Dec 2011 05:47:28 +0000 (21:47 -0800)]
Merge branch 'for-linus' of git://git./linux/kernel/git/viro/vfs

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  VFS: Fix race between CPU hotplug and lglocks

12 years agoMerge tag 'writeback' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux
Linus Torvalds [Sat, 24 Dec 2011 04:25:36 +0000 (20:25 -0800)]
Merge tag 'writeback' of git://git./linux/kernel/git/wfg/linux

for linus: writeback reason binary tracing format fix

* tag 'writeback' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux:
  writeback: show writeback reason with __print_symbolic

12 years agoMerge branch 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
Linus Torvalds [Fri, 23 Dec 2011 23:01:24 +0000 (15:01 -0800)]
Merge branch 'rc-fixes' of git://git./linux/kernel/git/mmarek/kbuild

* 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  kconfig: adapt update-po-config to new UML layout

12 years agoMerge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
Linus Torvalds [Fri, 23 Dec 2011 22:59:08 +0000 (14:59 -0800)]
Merge branch 'v4l_for_linus' of git://git./linux/kernel/git/mchehab/linux-media

* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media:
  [media] omap3isp: Fix crash caused by subdevs now having a pointer to devnodes

12 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux...
Linus Torvalds [Fri, 23 Dec 2011 22:58:39 +0000 (14:58 -0800)]
Merge branch 'for-linus' of git://git./linux/kernel/git/mason/linux-btrfs

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: call d_instantiate after all ops are setup
  Btrfs: fix worker lock misuse in find_worker

12 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
Linus Torvalds [Fri, 23 Dec 2011 22:58:14 +0000 (14:58 -0800)]
Merge git://git./linux/kernel/git/davem/sparc

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sparc64: Fix MSIQ HV call ordering in pci_sun4v_msiq_build_irq().

12 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Linus Torvalds [Fri, 23 Dec 2011 22:57:55 +0000 (14:57 -0800)]
Merge git://git./linux/kernel/git/davem/net

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
  netfilter: xt_connbytes: handle negation correctly
  net: relax rcvbuf limits
  rps: fix insufficient bounds checking in store_rps_dev_flow_table_cnt()
  net: introduce DST_NOPEER dst flag
  mqprio: Avoid panic if no options are provided
  bridge: provide a mtu() method for fake_dst_ops

12 years agoARM: 7237/1: PL330: Fix driver freeze
Javi Merino [Fri, 16 Dec 2011 15:04:36 +0000 (16:04 +0100)]
ARM: 7237/1: PL330: Fix driver freeze

Add a req_running field to the pl330_thread to track which request (if
any) has been submitted to the DMA.  This mechanism replaces the old
one in which we tried to guess the same by looking at the PC of the
DMA, which could prevent the driver from sending more requests if it
didn't guess correctly.

Reference: <1323631637-9610-1-git-send-email-javi.merino@arm.com>

Signed-off-by: Javi Merino <javi.merino@arm.com>
Acked-by: Jassi Brar <jaswinder.singh@linaro.org>
Tested-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoxfs: log all dirty inodes in xfs_fs_sync_fs
Christoph Hellwig [Tue, 20 Dec 2011 20:08:41 +0000 (20:08 +0000)]
xfs: log all dirty inodes in xfs_fs_sync_fs

Since Linux 2.6.36 the writeback code has introduces various measures for
live lock prevention during sync().  Unfortunately some of these are
actively harmful for the XFS model, where the inode gets marked dirty for
metadata from the data I/O handler.

The older_than_this checks that are now more strictly enforced since

    writeback: avoid livelocking WB_SYNC_ALL writeback

by only calling into __writeback_inodes_sb and thus only sampling the
current cut off time once.  But on a slow enough devices the previous
asynchronous sync pass might not have fully completed yet, and thus XFS
might mark metadata dirty only after that sampling of the cut off time for
the blocking pass already happened.  I have not myself reproduced this
myself on a real system, but by introducing artificial delay into the
XFS I/O completion workqueues it can be reproduced easily.

Fix this by iterating over all XFS inodes in ->sync_fs and log all that
are dirty.  This might log inode that only got redirtied after the
previous pass, but given how cheap delayed logging of inodes is it
isn't a major concern for performance.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Tested-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
12 years agoxfs: log the inode in ->write_inode calls for kupdate
Christoph Hellwig [Sun, 18 Dec 2011 15:49:55 +0000 (15:49 +0000)]
xfs: log the inode in ->write_inode calls for kupdate

If the writeback code writes back an inode because it has expired we currently
use the non-blockin ->write_inode path.  This means any inode that is pinned
is skipped.  With delayed logging and a workload that has very little log
traffic otherwise it is very likely that an inode that gets constantly
written to is always pinned, and thus we keep refusing to write it.  The VM
writeback code at that point redirties it and doesn't try to write it again
for another 30 seconds.  This means under certain scenarious time based
metadata writeback never happens.

Fix this by calling into xfs_log_inode for kupdate in addition to data
integrity syncs, and thus transfer the inode to the log ASAP.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Tested-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
12 years agoARM: 7197/1: errata: Remove SMP dependency for erratum 751472
Dave Martin [Thu, 8 Dec 2011 12:41:06 +0000 (13:41 +0100)]
ARM: 7197/1: errata: Remove SMP dependency for erratum 751472

Activation conditions for a workaround should not be encoded in the
workaround's direct dependencies if this makes otherwise reasonable
configuration choices impossible.

This patches uses the SMP/UP patching facilities instead to compile
out the workaround if the configuration means that it is definitely
not needed.

This means that configs for buggy silicon can simply select
ARM_ERRATA_751472, without preventing a UP kernel from being built
or duplicatiing knowledge about when to activate the workaround.
This seems the correct way to do things, because the erratum is a
property of the silicon, irrespective of what the kernel config
happens to be.

Signed-off-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: 7196/1: errata: Remove SMP dependency for erratum 720789
Dave Martin [Thu, 8 Dec 2011 12:37:46 +0000 (13:37 +0100)]
ARM: 7196/1: errata: Remove SMP dependency for erratum 720789

Activation conditions for a workaround should not be encoded in the
workaround's direct dependencies if this makes otherwise reasonable
configuration choices impossible.

The workaround for erratum 720789 only affects a code path which is
not active in UP kernels; hence it should be safe to turn on in UP
kernels, without penalty.

This patch simply removes the extra dependency on SMP from Kconfig.

This means that configs for buggy silicon can simply select
ARM_ERRATA_720789, without preventing a UP kernel from being built
or duplicatiing knowledge about when to activate the workaround.

Signed-off-by: Dave Martin <dave.martin@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoMerge branch 'nf' of git://1984.lsi.us.es/net
David S. Miller [Fri, 23 Dec 2011 19:29:20 +0000 (14:29 -0500)]
Merge branch 'nf' of git://1984.lsi.us.es/net

12 years agoASoC: wm8776: add missing break in sample size switch
Joachim Eastwood [Fri, 23 Dec 2011 16:32:25 +0000 (17:32 +0100)]
ASoC: wm8776: add missing break in sample size switch

Broken in commit d1dc698a54259cb454284456483b45f67c865cf8

Signed-off-by: Joachim Eastwood <joachim.eastwood@jotron.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
12 years agoperf/x86: Fix raw_spin_unlock_irqrestore() usage
Robert Richter [Fri, 23 Dec 2011 13:24:25 +0000 (14:24 +0100)]
perf/x86: Fix raw_spin_unlock_irqrestore() usage

Use raw_spin_unlock_irqrestore() as equivalent to
raw_spin_lock_irqsave().

Signed-off-by: Robert Richter <robert.richter@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1324646665-13334-1-git-send-email-robert.richter@amd.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
12 years agonetfilter: xt_connbytes: handle negation correctly
Florian Westphal [Fri, 16 Dec 2011 17:35:15 +0000 (18:35 +0100)]
netfilter: xt_connbytes: handle negation correctly

"! --connbytes 23:42" should match if the packet/byte count is not in range.

As there is no explict "invert match" toggle in the match structure,
userspace swaps the from and to arguments
(i.e., as if "--connbytes 42:23" were given).

However, "what <= 23 && what >= 42" will always be false.

Change things so we use "||" in case "from" is larger than "to".

This change may look like it breaks backwards compatibility when "to" is 0.
However, older iptables binaries will refuse "connbytes 42:0",
and current releases treat it to mean "! --connbytes 0:42",
so we should be fine.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
12 years agoBtrfs: call d_instantiate after all ops are setup
Al Viro [Fri, 23 Dec 2011 12:58:13 +0000 (07:58 -0500)]
Btrfs: call d_instantiate after all ops are setup

This closes races where btrfs is calling d_instantiate too soon during
inode creation.  All of the callers of btrfs_add_nondir are updated to
instantiate after the inode is fully setup in memory.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
12 years agoBtrfs: fix worker lock misuse in find_worker
Chris Mason [Fri, 23 Dec 2011 12:53:00 +0000 (07:53 -0500)]
Btrfs: fix worker lock misuse in find_worker

Dan Carpenter noticed that we were doing a double unlock on the worker
lock, and sometimes picking a worker thread without the lock held.

This fixes both errors.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
12 years agooprofile, arm/sh: Fix oprofile_arch_exit() linkage issue
Vladimir Zapolskiy [Thu, 22 Dec 2011 15:15:40 +0000 (16:15 +0100)]
oprofile, arm/sh: Fix oprofile_arch_exit() linkage issue

This change fixes a linking problem, which happens if oprofile
is selected to be compiled as built-in:

  `oprofile_arch_exit' referenced in section `.init.text' of
  arch/arm/oprofile/built-in.o: defined in discarded section
  `.exit.text' of arch/arm/oprofile/built-in.o

The problem is appeared after commit 87121ca504, which
introduced oprofile_arch_exit() calls from __init function. Note
that the aforementioned commit has been backported to stable
branches, and the problem is known to be reproduced at least
with 3.0.13 and 3.1.5 kernels.

Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@nokia.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: oprofile-list <oprofile-list@lists.sourceforge.net>
Cc: <stable@kernel.org>
Link: http://lkml.kernel.org/r/20111222151540.GB16765@erda.amd.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
12 years agoInput: sentelic - release mutex upon register write failure
Tai-hwa Liang [Fri, 23 Dec 2011 09:14:31 +0000 (01:14 -0800)]
Input: sentelic - release mutex upon register write failure

Make sure that mutex is released upon register writing failure.
This fixes boot freezing observed on ARM based OLPC
(http://dev.laptop.org/ticket/11357).

Signed-off-by: Paul Fox <pgf@laptop.org>
Signed-off-by: Tai-hwa Liang <avatar@sentelic.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
12 years agonet: relax rcvbuf limits
Eric Dumazet [Wed, 21 Dec 2011 07:11:44 +0000 (07:11 +0000)]
net: relax rcvbuf limits

skb->truesize might be big even for a small packet.

Its even bigger after commit 87fb4b7b533 (net: more accurate skb
truesize) and big MTU.

We should allow queueing at least one packet per receiver, even with a
low RCVBUF setting.

Reported-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agorps: fix insufficient bounds checking in store_rps_dev_flow_table_cnt()
Xi Wang [Thu, 22 Dec 2011 13:35:22 +0000 (13:35 +0000)]
rps: fix insufficient bounds checking in store_rps_dev_flow_table_cnt()

Setting a large rps_flow_cnt like (1 << 30) on 32-bit platform will
cause a kernel oops due to insufficient bounds checking.

if (count > 1<<30) {
/* Enforce a limit to prevent overflow */
return -EINVAL;
}
count = roundup_pow_of_two(count);
table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));

Note that the macro RPS_DEV_FLOW_TABLE_SIZE(count) is defined as:

... + (count * sizeof(struct rps_dev_flow))

where sizeof(struct rps_dev_flow) is 8.  (1 << 30) * 8 will overflow
32 bits.

This patch replaces the magic number (1 << 30) with a symbolic bound.

Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agonet: introduce DST_NOPEER dst flag
Eric Dumazet [Thu, 22 Dec 2011 04:15:53 +0000 (04:15 +0000)]
net: introduce DST_NOPEER dst flag

Chris Boot reported crashes occurring in ipv6_select_ident().

[  461.457562] RIP: 0010:[<ffffffff812dde61>]  [<ffffffff812dde61>]
ipv6_select_ident+0x31/0xa7

[  461.578229] Call Trace:
[  461.580742] <IRQ>
[  461.582870]  [<ffffffff812efa7f>] ? udp6_ufo_fragment+0x124/0x1a2
[  461.589054]  [<ffffffff812dbfe0>] ? ipv6_gso_segment+0xc0/0x155
[  461.595140]  [<ffffffff812700c6>] ? skb_gso_segment+0x208/0x28b
[  461.601198]  [<ffffffffa03f236b>] ? ipv6_confirm+0x146/0x15e
[nf_conntrack_ipv6]
[  461.608786]  [<ffffffff81291c4d>] ? nf_iterate+0x41/0x77
[  461.614227]  [<ffffffff81271d64>] ? dev_hard_start_xmit+0x357/0x543
[  461.620659]  [<ffffffff81291cf6>] ? nf_hook_slow+0x73/0x111
[  461.626440]  [<ffffffffa0379745>] ? br_parse_ip_options+0x19a/0x19a
[bridge]
[  461.633581]  [<ffffffff812722ff>] ? dev_queue_xmit+0x3af/0x459
[  461.639577]  [<ffffffffa03747d2>] ? br_dev_queue_push_xmit+0x72/0x76
[bridge]
[  461.646887]  [<ffffffffa03791e3>] ? br_nf_post_routing+0x17d/0x18f
[bridge]
[  461.653997]  [<ffffffff81291c4d>] ? nf_iterate+0x41/0x77
[  461.659473]  [<ffffffffa0374760>] ? br_flood+0xfa/0xfa [bridge]
[  461.665485]  [<ffffffff81291cf6>] ? nf_hook_slow+0x73/0x111
[  461.671234]  [<ffffffffa0374760>] ? br_flood+0xfa/0xfa [bridge]
[  461.677299]  [<ffffffffa0379215>] ?
nf_bridge_update_protocol+0x20/0x20 [bridge]
[  461.684891]  [<ffffffffa03bb0e5>] ? nf_ct_zone+0xa/0x17 [nf_conntrack]
[  461.691520]  [<ffffffffa0374760>] ? br_flood+0xfa/0xfa [bridge]
[  461.697572]  [<ffffffffa0374812>] ? NF_HOOK.constprop.8+0x3c/0x56
[bridge]
[  461.704616]  [<ffffffffa0379031>] ?
nf_bridge_push_encap_header+0x1c/0x26 [bridge]
[  461.712329]  [<ffffffffa037929f>] ? br_nf_forward_finish+0x8a/0x95
[bridge]
[  461.719490]  [<ffffffffa037900a>] ?
nf_bridge_pull_encap_header+0x1c/0x27 [bridge]
[  461.727223]  [<ffffffffa0379974>] ? br_nf_forward_ip+0x1c0/0x1d4 [bridge]
[  461.734292]  [<ffffffff81291c4d>] ? nf_iterate+0x41/0x77
[  461.739758]  [<ffffffffa03748cc>] ? __br_deliver+0xa0/0xa0 [bridge]
[  461.746203]  [<ffffffff81291cf6>] ? nf_hook_slow+0x73/0x111
[  461.751950]  [<ffffffffa03748cc>] ? __br_deliver+0xa0/0xa0 [bridge]
[  461.758378]  [<ffffffffa037533a>] ? NF_HOOK.constprop.4+0x56/0x56
[bridge]

This is caused by bridge netfilter special dst_entry (fake_rtable), a
special shared entry, where attaching an inetpeer makes no sense.

Problem is present since commit 87c48fa3b46 (ipv6: make fragment
identifications less predictable)

Introduce DST_NOPEER dst flag and make sure ipv6_select_ident() and
__ip_select_ident() fallback to the 'no peer attached' handling.

Reported-by: Chris Boot <bootc@bootc.net>
Tested-by: Chris Boot <bootc@bootc.net>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agomqprio: Avoid panic if no options are provided
Thomas Graf [Thu, 22 Dec 2011 02:05:07 +0000 (02:05 +0000)]
mqprio: Avoid panic if no options are provided

Userspace may not provide TCA_OPTIONS, in fact tc currently does
so not do so if no arguments are specified on the command line.
Return EINVAL instead of panicing.

Signed-off-by: Thomas Graf <tgraf@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agobridge: provide a mtu() method for fake_dst_ops
Eric Dumazet [Wed, 21 Dec 2011 20:00:32 +0000 (20:00 +0000)]
bridge: provide a mtu() method for fake_dst_ops

Commit 618f9bc74a039da76 (net: Move mtu handling down to the protocol
depended handlers) forgot the bridge netfilter case, adding a NULL
dereference in ip_fragment().

Reported-by: Chris Boot <bootc@bootc.net>
CC: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agoMerge branch 'for-linus' of git://neil.brown.name/md
Linus Torvalds [Thu, 22 Dec 2011 23:36:17 +0000 (15:36 -0800)]
Merge branch 'for-linus' of git://neil.brown.name/md

* 'for-linus' of git://neil.brown.name/md:
  md/bitmap: It is OK to clear bits during recovery.
  md: don't give up looking for spares on first failure-to-add
  md/raid5: ensure correct assessment of drives during degraded reshape.
  md/linear: fix hot-add of devices to linear arrays.

12 years agomd/bitmap: It is OK to clear bits during recovery.
NeilBrown [Thu, 22 Dec 2011 22:57:48 +0000 (09:57 +1100)]
md/bitmap: It is OK to clear bits during recovery.

commit d0a4bb492772ce5c4bdfba3744a99ed6f6fb238f introduced a
regression which is annoying but fairly harmless.

When writing to an array that is undergoing recovery (a spare
in being integrated into the array), writing to the array will
set bits in the bitmap, but they will not be cleared when the
write completes.

For bits covering areas that have not been recovered yet this is not a
problem as the recovery will clear the bits.  However bits set in
already-recovered region will stay set and never be cleared.
This doesn't risk data integrity.  The only negatives are:
 - next time there is a crash, more resyncing than necessary will
   be done.
 - the bitmap doesn't look clean, which is confusing.

While an array is recovering we don't want to update the
'events_cleared' setting in the bitmap but we do still want to clear
bits that have very recently been set - providing they were written to
the recovering device.

So split those two needs - which previously both depended on 'success'
and always clear the bit of the write went to all devices.

Signed-off-by: NeilBrown <neilb@suse.de>
12 years agomd: don't give up looking for spares on first failure-to-add
NeilBrown [Thu, 22 Dec 2011 22:57:19 +0000 (09:57 +1100)]
md: don't give up looking for spares on first failure-to-add

Before performing a recovery we try to remove any spares that
might not be working, then add any that might have become relevant.

Currently we abort on the first spare that cannot be added.
This is a false optimisation.
It is conceivable that - depending on rules in the personality - a
subsequent spare might be accepted.
Also the loop does other things like count the available spares and
reset the 'recovery_offset' value.

If we abort early these might not happen properly.

So remove the early abort.

In particular if you have an array what is undergoing recovery and
which has extra spares, then the recovery may not restart after as
reboot as the could of 'spares' might end up as zero.

Reported-by: Anssi Hannula <anssi.hannula@iki.fi>
Signed-off-by: NeilBrown <neilb@suse.de>
12 years agomd/raid5: ensure correct assessment of drives during degraded reshape.
NeilBrown [Thu, 22 Dec 2011 22:57:00 +0000 (09:57 +1100)]
md/raid5: ensure correct assessment of drives during degraded reshape.

While reshaping a degraded array (as when reshaping a RAID0 by first
converting it to a degraded RAID4) we currently get confused about
which devices are in_sync.  In most cases we get it right, but in the
region that is being reshaped we need to treat non-failed devices as
in-sync when we have the data but haven't actually written it out yet.

Reported-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
12 years agomd/linear: fix hot-add of devices to linear arrays.
NeilBrown [Thu, 22 Dec 2011 22:56:55 +0000 (09:56 +1100)]
md/linear: fix hot-add of devices to linear arrays.

commit d70ed2e4fafdbef0800e73942482bb075c21578b
broke hot-add to a linear array.
After that commit, metadata if not written to devices until they
have been fully integrated into the array as determined by
saved_raid_disk.  That patch arranged to clear that field after
a recovery completed.

However for linear arrays, there is no recovery - the integration is
instantaneous.  So we need to explicitly clear the saved_raid_disk
field.

Signed-off-by: NeilBrown <neilb@suse.de>
12 years agosparc64: Fix MSIQ HV call ordering in pci_sun4v_msiq_build_irq().
David S. Miller [Thu, 22 Dec 2011 21:23:59 +0000 (13:23 -0800)]
sparc64: Fix MSIQ HV call ordering in pci_sun4v_msiq_build_irq().

This silently was working for many years and stopped working on
Niagara-T3 machines.

We need to set the MSIQ to VALID before we can set it's state to IDLE.

On Niagara-T3, setting the state to IDLE first was causing HV_EINVAL
errors.  The hypervisor documentation says, rather ambiguously, that
the MSIQ must be "initialized" before one can set the state.

I previously understood this to mean merely that a successful setconf()
operation has been performed on the MSIQ, which we have done at this
point.  But it seems to also mean that it has been set VALID too.

Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agoMerge branch 'usb-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Thu, 22 Dec 2011 20:59:47 +0000 (12:59 -0800)]
Merge branch 'usb-linus' of git://git./linux/kernel/git/gregkh/usb

* 'usb-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  USB: Fix usb/isp1760 build on sparc
  usb: gadget: epautoconf: do not change number of streams
  usb: dwc3: core: fix cached revision on our structure
  usb: musb: fix reset issue with full speed device

12 years agoMerge branch 'upstream-linus' of git://github.com/jgarzik/libata-dev
Linus Torvalds [Thu, 22 Dec 2011 20:53:32 +0000 (12:53 -0800)]
Merge branch 'upstream-linus' of git://github.com/jgarzik/libata-dev

* 'upstream-linus' of git://github.com/jgarzik/libata-dev:
  pata_of_platform: Add missing CONFIG_OF_IRQ dependency.

12 years agopata_of_platform: Add missing CONFIG_OF_IRQ dependency.
David Miller [Wed, 21 Dec 2011 22:38:10 +0000 (17:38 -0500)]
pata_of_platform: Add missing CONFIG_OF_IRQ dependency.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
12 years agoipv4: using prefetch requires including prefetch.h
Stephen Rothwell [Thu, 22 Dec 2011 06:03:29 +0000 (17:03 +1100)]
ipv4: using prefetch requires including prefetch.h

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: David Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agovmwgfx: fix incorrect VRAM size check in vmw_kms_fb_create()
Xi Wang [Wed, 21 Dec 2011 10:18:33 +0000 (05:18 -0500)]
vmwgfx: fix incorrect VRAM size check in vmw_kms_fb_create()

Commit e133e737 didn't correctly fix the integer overflow issue.

- unsigned int required_size;
+ u64 required_size;
...
required_size = mode_cmd->pitch * mode_cmd->height;
- if (unlikely(required_size > dev_priv->vram_size)) {
+ if (unlikely(required_size > (u64) dev_priv->vram_size)) {

Note that both pitch and height are u32.  Their product is still u32 and
would overflow before being assigned to required_size.  A correct way is
to convert pitch and height to u64 before the multiplication.

required_size = (u64)mode_cmd->pitch * (u64)mode_cmd->height;

This patch calls the existing vmw_kms_validate_mode_vram() for
validation.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Reviewed-and-tested-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agodrm/radeon/kms: bail on BTC parts if MC ucode is missing
Alex Deucher [Wed, 21 Dec 2011 16:58:17 +0000 (11:58 -0500)]
drm/radeon/kms: bail on BTC parts if MC ucode is missing

We already do this for cayman, need to also do it for
BTC parts.  The default memory and voltage setup is not
adequate for advanced operation.  Continuing will
result in an unusable display.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@kernel.org
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
12 years agoVFS: Fix race between CPU hotplug and lglocks
Srivatsa S. Bhat [Wed, 21 Dec 2011 21:15:29 +0000 (02:45 +0530)]
VFS: Fix race between CPU hotplug and lglocks

Currently, the *_global_[un]lock_online() routines are not at all synchronized
with CPU hotplug. Soft-lockups detected as a consequence of this race was
reported earlier at https://lkml.org/lkml/2011/8/24/185. (Thanks to Cong Meng
for finding out that the root-cause of this issue is the race condition
between br_write_[un]lock() and CPU hotplug, which results in the lock states
getting messed up).

Fixing this race by just adding {get,put}_online_cpus() at appropriate places
in *_global_[un]lock_online() is not a good option, because, then suddenly
br_write_[un]lock() would become blocking, whereas they have been kept as
non-blocking all this time, and we would want to keep them that way.

So, overall, we want to ensure 3 things:
1. br_write_lock() and br_write_unlock() must remain as non-blocking.
2. The corresponding lock and unlock of the per-cpu spinlocks must not happen
   for different sets of CPUs.
3. Either prevent any new CPU online operation in between this lock-unlock, or
   ensure that the newly onlined CPU does not proceed with its corresponding
   per-cpu spinlock unlocked.

To achieve all this:
(a) We introduce a new spinlock that is taken by the *_global_lock_online()
    routine and released by the *_global_unlock_online() routine.
(b) We register a callback for CPU hotplug notifications, and this callback
    takes the same spinlock as above.
(c) We maintain a bitmap which is close to the cpu_online_mask, and once it is
    initialized in the lock_init() code, all future updates to it are done in
    the callback, under the above spinlock.
(d) The above bitmap is used (instead of cpu_online_mask) while locking and
    unlocking the per-cpu locks.

The callback takes the spinlock upon the CPU_UP_PREPARE event. So, if the
br_write_lock-unlock sequence is in progress, the callback keeps spinning,
thus preventing the CPU online operation till the lock-unlock sequence is
complete. This takes care of requirement (3).

The bitmap that we maintain remains unmodified throughout the lock-unlock
sequence, since all updates to it are managed by the callback, which takes
the same spinlock as the one taken by the lock code and released only by the
unlock routine. Combining this with (d) above, satisfies requirement (2).

Overall, since we use a spinlock (mentioned in (a)) to prevent CPU hotplug
operations from racing with br_write_lock-unlock, requirement (1) is also
taken care of.

By the way, it is to be noted that a CPU offline operation can actually run
in parallel with our lock-unlock sequence, because our callback doesn't react
to notifications earlier than CPU_DEAD (in order to maintain our bitmap
properly). And this means, since we use our own bitmap (which is stale, on
purpose) during the lock-unlock sequence, we could end up unlocking the
per-cpu lock of an offline CPU (because we had locked it earlier, when the
CPU was online), in order to satisfy requirement (2). But this is harmless,
though it looks a bit awkward.

Debugged-by: Cong Meng <mc@linux.vnet.ibm.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@vger.kernel.org
12 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Linus Torvalds [Thu, 22 Dec 2011 02:29:26 +0000 (18:29 -0800)]
Merge git://git./linux/kernel/git/davem/net

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
  net: Add a flow_cache_flush_deferred function
  ipv4: reintroduce route cache garbage collector
  net: have ipconfig not wait if no dev is available
  sctp: Do not account for sizeof(struct sk_buff) in estimated rwnd
  asix: new device id
  davinci-cpdma: fix locking issue in cpdma_chan_stop
  sctp: fix incorrect overflow check on autoclose
  r8169: fix Config2 MSIEnable bit setting.
  llc: llc_cmsg_rcv was getting called after sk_eat_skb.
  net: bpf_jit: fix an off-one bug in x86_64 cond jump target
  iwlwifi: update SCD BC table for all SCD queues
  Revert "Bluetooth: Revert: Fix L2CAP connection establishment"
  Bluetooth: Clear RFCOMM session timer when disconnecting last channel
  Bluetooth: Prevent uninitialized data access in L2CAP configuration
  iwlwifi: allow to switch to HT40 if not associated
  iwlwifi: tx_sync only on PAN context
  mwifiex: avoid double list_del in command cancel path
  ath9k: fix max phy rate at rate control init
  nfc: signedness bug in __nci_request()
  iwlwifi: do not set the sequence control bit is not needed

12 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Linus Torvalds [Thu, 22 Dec 2011 02:29:05 +0000 (18:29 -0800)]
Merge branch 'for-linus' of git://git./linux/kernel/git/tiwai/sound

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: atmel/ac97c: using software reset instead hardware reset if not available

12 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6
Linus Torvalds [Thu, 22 Dec 2011 02:28:52 +0000 (18:28 -0800)]
Merge branch 'for-linus' of git://git./linux/kernel/git/sameo/mfd-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6:
  mfd: Include linux/io.h to jz4740-adc
  mfd: Use request_threaded_irq for twl4030-irq instead of irq_set_chained_handler
  mfd: Base interrupt for twl4030-irq must be one-shot
  mfd: Handle tps65910 clear-mask correctly
  mfd: add #ifdef CONFIG_DEBUG_FS guard for ab8500_debug_resources
  mfd: Fix twl-core oops while calling twl_i2c_* for unbound driver
  mfd: include linux/module.h for ab5500-debugfs
  mfd: Update wm8994 active device checks for WM1811
  mfd: Set tps6586x bits if new value is different from the old one
  mfd: Set da903x bits if new value is different from the old one
  mfd: Set adp5520 bits if new value is different from the old one
  mfd: Add missed free_irq in da903x_remove

12 years agovfs: __read_cache_page should use gfp argument rather than GFP_KERNEL
Dave Kleikamp [Wed, 21 Dec 2011 17:05:48 +0000 (11:05 -0600)]
vfs: __read_cache_page should use gfp argument rather than GFP_KERNEL

lockdep reports a deadlock in jfs because a special inode's rw semaphore
is taken recursively.  The mapping's gfp mask is GFP_NOFS, but is not
used when __read_cache_page() calls add_to_page_cache_lru().

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Acked-by: Hugh Dickins <hughd@google.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoMerge branch 'for-greg' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb...
Greg Kroah-Hartman [Wed, 21 Dec 2011 22:42:17 +0000 (14:42 -0800)]
Merge branch 'for-greg' of git://git./linux/kernel/git/balbi/usb into usb-linus

* 'for-greg' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb:
  usb: gadget: epautoconf: do not change number of streams
  usb: dwc3: core: fix cached revision on our structure
  usb: musb: fix reset issue with full speed device

12 years agoUSB: Fix usb/isp1760 build on sparc
David Miller [Wed, 21 Dec 2011 22:31:54 +0000 (17:31 -0500)]
USB: Fix usb/isp1760 build on sparc

This commit:

commit 8f5d621543cb064d2989fc223d3c2bc61a43981e
Author: Joachim Foerster <joachim.foerster@missinglinkelectronics.com>
Date:   Mon Oct 10 18:06:54 2011 +0200

    usb/isp1760: Let OF bindings depend on general CONFIG_OF instead of PPC_OF .

    To be able to use the driver on other OF-aware architectures, too.
    And add necessary OF related #includes to fix compilation error.

Signed-off-by: Joachim Foerster <joachim.foerster@missinglinkelectronics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
enabled the build on all CONFIG_OF architectures, but it cannot do
this.

This driver depends upon CONFIG_OF_IRQ but not all CONFIG_OF platforms
support that infrastructure, in particular Sparc does not so the
build fails.

Please push a patch like the following to Linus so that this code only
gets built where it actually should.

--------------------
usb/isp1760: Add missing CONFIG_OF_IRQ dependency on OF code.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
12 years agonet: Add a flow_cache_flush_deferred function
Steffen Klassert [Wed, 21 Dec 2011 21:48:08 +0000 (16:48 -0500)]
net: Add a flow_cache_flush_deferred function

flow_cach_flush() might sleep but can be called from
atomic context via the xfrm garbage collector. So add
a flow_cache_flush_deferred() function and use this if
the xfrm garbage colector is invoked from within the
packet path.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agoipv4: reintroduce route cache garbage collector
Eric Dumazet [Wed, 21 Dec 2011 20:47:16 +0000 (15:47 -0500)]
ipv4: reintroduce route cache garbage collector

Commit 2c8cec5c10b (ipv4: Cache learned PMTU information in inetpeer)
removed IP route cache garbage collector a bit too soon, as this gc was
responsible for expired routes cleanup, releasing their neighbour
reference.

As pointed out by Robert Gladewitz, recent kernels can fill and exhaust
their neighbour cache.

Reintroduce the garbage collection, since we'll have to wait our
neighbour lookups become refcount-less to not depend on this stuff.

Reported-by: Robert Gladewitz <gladewitz@gmx.de>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
12 years agoMerge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
John W. Linville [Wed, 21 Dec 2011 18:18:22 +0000 (13:18 -0500)]
Merge branch 'master' of git://git./linux/kernel/git/linville/wireless into for-davem

12 years agoblock: re-use existing 'reading' variable instead of checking direction again
majianpeng [Wed, 21 Dec 2011 14:27:24 +0000 (15:27 +0100)]
block: re-use existing 'reading' variable instead of checking direction again

Signed-off-by: majianpeng <majianpeng@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
12 years agofirmware: Refer to the co-maintained linux-firmware.git repository
Ben Hutchings [Wed, 21 Dec 2011 03:54:24 +0000 (03:54 +0000)]
firmware: Refer to the co-maintained linux-firmware.git repository

David and I are sharing maintenance of this repository.  Patches
should be sent to both of us.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
12 years agoMerge git://git.infradead.org/mtd-2.6
Linus Torvalds [Wed, 21 Dec 2011 02:39:37 +0000 (18:39 -0800)]
Merge git://git.infradead.org/mtd-2.6

* git://git.infradead.org/mtd-2.6:
  mtd: plat_ram: call mtd_device_register only if partition data exists
  mtd: pxa2xx-flash.c: It used to fall back to provided table.
  mtd: gpmi: add missing include 'module.h'
  mtd: ndfc: fix typo in structure dereference

12 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
Linus Torvalds [Wed, 21 Dec 2011 02:31:34 +0000 (18:31 -0800)]
Merge branch 'for-linus' of git://git./linux/kernel/git/cjb/mmc

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc:
  mmc: vub300: fix type of firmware_rom_wait_states module parameter
  Revert "mmc: enable runtime PM by default"
  mmc: sdhci: remove "state" argument from sdhci_suspend_host