GitHub/moto-9609/android_kernel_motorola_exynos9610.git
11 years agoxen/events: mask events when changing their VCPU binding
David Vrabel [Thu, 15 Aug 2013 12:21:07 +0000 (13:21 +0100)]
xen/events: mask events when changing their VCPU binding

When a event is being bound to a VCPU there is a window between the
EVTCHNOP_bind_vpcu call and the adjustment of the local per-cpu masks
where an event may be lost.  The hypervisor upcalls the new VCPU but
the kernel thinks that event is still bound to the old VCPU and
ignores it.

There is even a problem when the event is being bound to the same VCPU
as there is a small window beween the clear_bit() and set_bit() calls
in bind_evtchn_to_cpu().  When scanning for pending events, the kernel
may read the bit when it is momentarily clear and ignore the event.

Avoid this by masking the event during the whole bind operation.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
CC: stable@vger.kernel.org
11 years agoxen/events: initialize local per-cpu mask for all possible events
David Vrabel [Thu, 15 Aug 2013 12:21:06 +0000 (13:21 +0100)]
xen/events: initialize local per-cpu mask for all possible events

The sizeof() argument in init_evtchn_cpu_bindings() is incorrect
resulting in only the first 64 (or 32 in 32-bit guests) ports having
their bindings being initialized to VCPU 0.

In most cases this does not cause a problem as request_irq() will set
the irq affinity which will set the correct local per-cpu mask.
However, if the request_irq() is called on a VCPU other than 0, there
is a window between the unmasking of the event and the affinity being
set were an event may be lost because it is not locally unmasked on
any VCPU. If request_irq() is called on VCPU 0 then local irqs are
disabled during the window and the race does not occur.

Fix this by initializing all NR_EVENT_CHANNEL bits in the local
per-cpu masks.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: stable@vger.kernel.org
11 years agox86/xen: do not identity map UNUSABLE regions in the machine E820
David Vrabel [Fri, 16 Aug 2013 14:42:55 +0000 (15:42 +0100)]
x86/xen: do not identity map UNUSABLE regions in the machine E820

If there are UNUSABLE regions in the machine memory map, dom0 will
attempt to map them 1:1 which is not permitted by Xen and the kernel
will crash.

There isn't anything interesting in the UNUSABLE region that the dom0
kernel needs access to so we can avoid making the 1:1 mapping and
treat it as RAM.

We only do this for dom0, as that is where tboot case shows up.
A PV domU could have an UNUSABLE region in its pseudo-physical map
and would need to be handled in another patch.

This fixes a boot failure on hosts with tboot.

tboot marks a region in the e820 map as unusable and the dom0 kernel
would attempt to map this region and Xen does not permit unusable
regions to be mapped by guests.

  (XEN)  0000000000000000 - 0000000000060000 (usable)
  (XEN)  0000000000060000 - 0000000000068000 (reserved)
  (XEN)  0000000000068000 - 000000000009e000 (usable)
  (XEN)  0000000000100000 - 0000000000800000 (usable)
  (XEN)  0000000000800000 - 0000000000972000 (unusable)

tboot marked this region as unusable.

  (XEN)  0000000000972000 - 00000000cf200000 (usable)
  (XEN)  00000000cf200000 - 00000000cf38f000 (reserved)
  (XEN)  00000000cf38f000 - 00000000cf3ce000 (ACPI data)
  (XEN)  00000000cf3ce000 - 00000000d0000000 (reserved)
  (XEN)  00000000e0000000 - 00000000f0000000 (reserved)
  (XEN)  00000000fe000000 - 0000000100000000 (reserved)
  (XEN)  0000000100000000 - 0000000630000000 (usable)

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
[v1: Altered the patch and description with domU's with UNUSABLE regions]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/arm: missing put_cpu in xen_percpu_init
Julien Grall [Mon, 29 Jul 2013 16:06:05 +0000 (17:06 +0100)]
xen/arm: missing put_cpu in xen_percpu_init

When CONFIG_PREEMPT is enabled, Linux will not be able to boot and warn:
[    4.127825] ------------[ cut here ]------------
[    4.133376] WARNING: at init/main.c:699 do_one_initcall+0x150/0x158()
[    4.140738] initcall xen_init_events+0x0/0x10c returned with preemption imbalance

This is because xen_percpu_init uses get_cpu but doesn't have the corresponding
put_cpu.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
11 years agoMerging v3.10-rc2 as I need to apply a fix for
Stefano Stabellini [Mon, 5 Aug 2013 11:18:22 +0000 (11:18 +0000)]
Merging v3.10-rc2 as I need to apply a fix for

3cc8e40e8ff8e232a9dd672da81beabd09f87366
"xen/arm: rename xen_secondary_init and run it on every online cpu"

The commit is in v3.10-rc2, the current branch is based on v3.10-rc1.

11 years agoxen/tmem: do not allow XEN_TMEM on ARM64
Stefano Stabellini [Tue, 23 Jul 2013 16:46:58 +0000 (17:46 +0100)]
xen/tmem: do not allow XEN_TMEM on ARM64

tmem is not supported on arm or arm64 yet. Will revert this
once the Xen hypervisor supports it.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/evtchn: avoid a deadlock when unbinding an event channel
David Vrabel [Fri, 19 Jul 2013 14:51:58 +0000 (15:51 +0100)]
xen/evtchn: avoid a deadlock when unbinding an event channel

Unbinding an event channel (either with the ioctl or when the evtchn
device is closed) may deadlock because disable_irq() is called with
port_user_lock held which is also locked by the interrupt handler.

Think of the IOCTL_EVTCHN_UNBIND is being serviced, the routine has
just taken the lock, and an interrupt happens. The evtchn_interrupt
is invoked, tries to take the lock and spins forever.

A quick glance at the code shows that the spinlock is a local IRQ
variant. Unfortunately that does not help as "disable_irq() waits for
the interrupt handler on all CPUs to stop running.  If the irq occurs
on another VCPU, it tries to take port_user_lock and can't because
the unbind ioctl is holding it." (from David). Hence we cannot
depend on the said spinlock to protect us. We could make it a system
wide IRQ disable spinlock but there is a better way.

We can piggyback on the fact that the existence of the spinlock is
to make get_port_user() checks be up-to-date. And we can alter those
checks to not depend on the spin lock (as it's protected by u->bind_mutex
in the ioctl) and can remove the unnecessary locking (this is
IOCTL_EVTCHN_UNBIND) path.

In the interrupt handler we cannot use the mutex, but we do not
need it.

"The unbind disables the irq before making the port user stale, so when
you clear it you are guaranteed that the interrupt handler that might
use that port cannot be running." (from David).

Hence this patch removes the spinlock usage on the teardown path
and piggybacks on disable_irq happening before we muck with the
get_port_user() data. This ensures that the interrupt handler will
never run on stale data.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
[v1: Expanded the commit description a bit]

11 years agoxen/arm: enable PV control for ARM
Julien Grall [Tue, 23 Jul 2013 15:21:28 +0000 (16:21 +0100)]
xen/arm: enable PV control for ARM

Enable lifecyle management (reboot, shutdown...) from the toolstack
for ARM guests.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
11 years agoxen/arm64: Don't compile cpu hotplug
Julien Grall [Mon, 22 Jul 2013 21:40:58 +0000 (22:40 +0100)]
xen/arm64: Don't compile cpu hotplug

On ARM64, when CONFIG_XEN=y, the compilation will fail because CPU hotplug is
not yet supported with XEN. For now, disable it.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
11 years agoxenbus: frontend resume cleanup
Aurelien Chartier [Tue, 9 Jul 2013 13:29:35 +0000 (14:29 +0100)]
xenbus: frontend resume cleanup

Only create the delayed resume workqueue if we are running in the same domain
as xenstored and issue a warning if the workqueue creation fails.

Move the work initialization to the device probe so it is done only once.

Signed-off-by: Aurelien Chartier <aurelien.chartier@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
11 years agoxen/time: remove blocked time accounting from xen "clockchip"
Laszlo Ersek [Tue, 18 Oct 2011 20:42:59 +0000 (22:42 +0200)]
xen/time: remove blocked time accounting from xen "clockchip"

... because the "clock_event_device framework" already accounts for idle
time through the "event_handler" function pointer in
xen_timer_interrupt().

The patch is intended as the completion of [1]. It should fix the double
idle times seen in PV guests' /proc/stat [2]. It should be orthogonal to
stolen time accounting (the removed code seems to be isolated).

The approach may be completely misguided.

[1] https://lkml.org/lkml/2011/10/6/10
[2] http://lists.xensource.com/archives/html/xen-devel/2010-08/msg01068.html

John took the time to retest this patch on top of v3.10 and reported:
"idle time is correctly incremented for pv and hvm for the normal
case, nohz=off and nohz=idle." so lets put this patch in.

CC: stable@vger.kernel.org
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: John Haxby <john.haxby@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen: Convert printks to pr_<level>
Joe Perches [Fri, 28 Jun 2013 10:21:41 +0000 (03:21 -0700)]
xen: Convert printks to pr_<level>

Convert printks to pr_<level> (excludes printk(KERN_DEBUG...)
to be more consistent throughout the xen subsystem.

Add pr_fmt with KBUILD_MODNAME or "xen:" KBUILD_MODNAME
Coalesce formats and add missing word spaces
Add missing newlines
Align arguments and reflow to 80 columns
Remove DRV_NAME from formats as pr_fmt adds the same content

This does change some of the prefixes of these messages
but it also does make them more consistent.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen: ifdef CONFIG_HIBERNATE_CALLBACKS xen_*_suspend
Stefano Stabellini [Thu, 27 Jun 2013 13:28:38 +0000 (14:28 +0100)]
xen: ifdef CONFIG_HIBERNATE_CALLBACKS xen_*_suspend

xen_hvm_post_suspend, xen_pre_suspend, xen_post_suspend are only used if
CONFIG_HIBERNATE_CALLBACKS is defined, resulting in:

drivers/xen/manage.c:46:13: warning: ‘xen_hvm_post_suspend’ defined but not used [-Wunused-function]
drivers/xen/manage.c:52:13: warning: ‘xen_pre_suspend’ defined but not used [-Wunused-function]
drivers/xen/manage.c:59:13: warning: ‘xen_post_suspend’ defined but not used [-Wunused-function]

If the kernel config is missing CONFIG_HIBERNATE_CALLBACKS.

Simply ifdef CONFIG_HIBERNATE_CALLBACKS the three functions.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/pcifront: Deal with toolstack missing 'XenbusStateClosing' state.
Konrad Rzeszutek Wilk [Mon, 10 Jun 2013 20:48:09 +0000 (16:48 -0400)]
xen/pcifront: Deal with toolstack missing 'XenbusStateClosing' state.

There are two tool-stack that can instruct the Xen PCI frontend
and backend to change states: 'xm' (Python code with a daemon),
and 'xl' (C library - does not keep state changes).

With the 'xm', the path to disconnect a single PCI device (xm pci-detach
<guest> <BDF>) is:

4(Connected)->7(Reconfiguring*)-> 8(Reconfigured)-> 4(Connected)->5(Closing*).

The * is for states that the tool-stack sets. For 'xl', it is similar:

4(Connected)->7(Reconfiguring*)-> 8(Reconfigured)-> 4(Connected)

Both of them also tear down the XenBus structure, so the backend
state ends up going in the 3(Initialised) and calls pcifront_xenbus_remove.

When a PCI device is plugged back in (xm pci-attach <guest> <BDF>)
both of them follow the same pattern:

2(InitWait*), 3(Initialized*), 4(Connected*)->4(Connected).

[xen-pcifront ignores the 2,3 state changes and only acts when
4 (Connected) has been reached]

Note that this is for a _single_ PCI device. If there were two
PCI devices and only one was disconnected 'xm' would show the same
state changes.

The problem is that git commit 3d925320e9e2de162bd138bf97816bda8c3f71be
("xen/pcifront: Use Xen-SWIOTLB when initting if required") introduced
a mechanism to initialize the SWIOTLB when the Xen PCI front moves to
Connected state. It also had some aggressive seatbelt code check that
would warn the user if one tried to change to Connected state without
hitting first the Closing state:

 pcifront pci-0: PCI frontend already installed!

However, that code can be relaxed and we can continue on working
even if the frontend is instructed to be the 'Connected' state with
no devices and then gets tickled to be in 'Connected' state again.

In other words, this 4(Connected)->5(Closing)->4(Connected) state
was expected, while 4(Connected)->.... anything but 5(Closing)->4(Connected)
was not. This patch removes that aggressive check and allows
Xen pcifront to work with the 'xl' toolstack (for one or more
PCI devices) and with 'xm' toolstack (for more than two PCI
devices).

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org
Cc: stable@vger.kernel.org
[v2: Added in the description about two PCI devices]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/time: Free onlined per-cpu data structure if we want to online it again.
Konrad Rzeszutek Wilk [Tue, 4 Jun 2013 21:13:29 +0000 (17:13 -0400)]
xen/time: Free onlined per-cpu data structure if we want to online it again.

If the per-cpu time data structure has been onlined already and
we are trying to online it again, then free the previous copy
before blindly over-writting it.

A developer naturally should not call this function multiple times
but just in case.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/time: Check that the per_cpu data structure has data before freeing.
Konrad Rzeszutek Wilk [Tue, 4 Jun 2013 21:11:52 +0000 (17:11 -0400)]
xen/time: Check that the per_cpu data structure has data before freeing.

We don't check whether the per_cpu data structure has actually
been freed in the past. This checks it and if it has been freed
in the past then just continues on without double-freeing.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/time: Don't leak interrupt name when offlining.
Konrad Rzeszutek Wilk [Tue, 4 Jun 2013 21:09:36 +0000 (17:09 -0400)]
xen/time: Don't leak interrupt name when offlining.

When the user does:
    echo 0 > /sys/devices/system/cpu/cpu1/online
    echo 1 > /sys/devices/system/cpu/cpu1/online

kmemleak reports:
kmemleak: 7 new suspected memory leaks (see /sys/kernel/debug/kmemleak)

One of the leaks is from xen/time:

unreferenced object 0xffff88003fa51280 (size 32):
  comm "swapper/0", pid 1, jiffies 4294667339 (age 1027.789s)
  hex dump (first 32 bytes):
    74 69 6d 65 72 31 00 00 00 00 00 00 00 00 00 00  timer1..........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81660721>] kmemleak_alloc+0x21/0x50
    [<ffffffff81190aac>] __kmalloc_track_caller+0xec/0x2a0
    [<ffffffff812fe1bb>] kvasprintf+0x5b/0x90
    [<ffffffff812fe228>] kasprintf+0x38/0x40
    [<ffffffff81041ec1>] xen_setup_timer+0x51/0xf0
    [<ffffffff8166339f>] xen_cpu_up+0x5f/0x3e8
    [<ffffffff8166bbf5>] _cpu_up+0xd1/0x14b
    [<ffffffff8166bd48>] cpu_up+0xd9/0xec
    [<ffffffff81ae6e4a>] smp_init+0x4b/0xa3
    [<ffffffff81ac4981>] kernel_init_freeable+0xdb/0x1e6
    [<ffffffff8165ce39>] kernel_init+0x9/0xf0
    [<ffffffff8167edfc>] ret_from_fork+0x7c/0xb0
    [<ffffffffffffffff>] 0xffffffffffffffff

This patch fixes it by stashing away the 'name' in the per-cpu
data structure and freeing it when offlining the CPU.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/time: Encapsulate the struct clock_event_device in another structure.
Konrad Rzeszutek Wilk [Tue, 4 Jun 2013 21:06:36 +0000 (17:06 -0400)]
xen/time: Encapsulate the struct clock_event_device in another structure.

We don't do any code movement. We just encapsulate the struct clock_event_device
in a new structure which contains said structure and a pointer to
a char *name. The 'name' will be used in 'xen/time: Don't leak interrupt
name when offlining'.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/spinlock: Don't leak interrupt name when offlining.
Konrad Rzeszutek Wilk [Wed, 5 Jun 2013 14:44:47 +0000 (10:44 -0400)]
xen/spinlock: Don't leak interrupt name when offlining.

When the user does:
echo 0 > /sys/devices/system/cpu/cpu1/online
echo 1 > /sys/devices/system/cpu/cpu1/online

kmemleak reports:
kmemleak: 7 new suspected memory leaks (see /sys/kernel/debug/kmemleak)

unreferenced object 0xffff88003fa51260 (size 32):
  comm "swapper/0", pid 1, jiffies 4294667339 (age 1027.789s)
  hex dump (first 32 bytes):
    73 70 69 6e 6c 6f 63 6b 31 00 00 00 00 00 00 00  spinlock1.......
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81660721>] kmemleak_alloc+0x21/0x50
    [<ffffffff81190aac>] __kmalloc_track_caller+0xec/0x2a0
    [<ffffffff812fe1bb>] kvasprintf+0x5b/0x90
    [<ffffffff812fe228>] kasprintf+0x38/0x40
    [<ffffffff81663789>] xen_init_lock_cpu+0x61/0xbe
    [<ffffffff816633a6>] xen_cpu_up+0x66/0x3e8
    [<ffffffff8166bbf5>] _cpu_up+0xd1/0x14b
    [<ffffffff8166bd48>] cpu_up+0xd9/0xec
    [<ffffffff81ae6e4a>] smp_init+0x4b/0xa3
    [<ffffffff81ac4981>] kernel_init_freeable+0xdb/0x1e6
    [<ffffffff8165ce39>] kernel_init+0x9/0xf0
    [<ffffffff8167edfc>] ret_from_fork+0x7c/0xb0
    [<ffffffffffffffff>] 0xffffffffffffffff

Instead of doing it like the "xen/smp: Don't leak interrupt name when offlining"
patch did (which has a per-cpu structure which contains both the
IRQ number and char*) we use a per-cpu pointers to a *char.

The reason is that the "__this_cpu_read(lock_kicker_irq);" macro
blows up with "__bad_size_call_parameter()" as the size of the
returned structure is not within the parameters of what it expects
and optimizes for.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/smp: Don't leak interrupt name when offlining.
Konrad Rzeszutek Wilk [Tue, 4 Jun 2013 20:47:17 +0000 (16:47 -0400)]
xen/smp: Don't leak interrupt name when offlining.

When the user does:
echo 0 > /sys/devices/system/cpu/cpu1/online
echo 1 > /sys/devices/system/cpu/cpu1/online

kmemleak reports:
kmemleak: 7 new suspected memory leaks (see /sys/kernel/debug/kmemleak)

unreferenced object 0xffff88003fa51240 (size 32):
  comm "swapper/0", pid 1, jiffies 4294667339 (age 1027.789s)
  hex dump (first 32 bytes):
    72 65 73 63 68 65 64 31 00 00 00 00 00 00 00 00  resched1........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81660721>] kmemleak_alloc+0x21/0x50
    [<ffffffff81190aac>] __kmalloc_track_caller+0xec/0x2a0
    [<ffffffff812fe1bb>] kvasprintf+0x5b/0x90
    [<ffffffff812fe228>] kasprintf+0x38/0x40
    [<ffffffff81047ed1>] xen_smp_intr_init+0x41/0x2c0
    [<ffffffff816636d3>] xen_cpu_up+0x393/0x3e8
    [<ffffffff8166bbf5>] _cpu_up+0xd1/0x14b
    [<ffffffff8166bd48>] cpu_up+0xd9/0xec
    [<ffffffff81ae6e4a>] smp_init+0x4b/0xa3
    [<ffffffff81ac4981>] kernel_init_freeable+0xdb/0x1e6
    [<ffffffff8165ce39>] kernel_init+0x9/0xf0
    [<ffffffff8167edfc>] ret_from_fork+0x7c/0xb0
    [<ffffffffffffffff>] 0xffffffffffffffff

This patch fixes some of it by using the 'struct xen_common_irq->name'
field to stash away the char so that it can be freed when
the interrupt line is destroyed.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/smp: Set the per-cpu IRQ number to a valid default.
Konrad Rzeszutek Wilk [Tue, 4 Jun 2013 20:42:29 +0000 (16:42 -0400)]
xen/smp: Set the per-cpu IRQ number to a valid default.

When we free it we want to make sure to set it to a default
value of -1 so that we don't double-free it (in case somebody
calls us twice).

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/smp: Introduce a common structure to contain the IRQ name and interrupt line.
Konrad Rzeszutek Wilk [Tue, 4 Jun 2013 20:37:44 +0000 (16:37 -0400)]
xen/smp: Introduce a common structure to contain the IRQ name and interrupt line.

This patch adds a new structure to contain the common two things
that each of the per-cpu interrupts need:
 - an interrupt number,
 - and the name of the interrupt (to be added in 'xen/smp: Don't leak
   interrupt name when offlining').

This allows us to carry the tuple of the per-cpu interrupt data structure
and expand it as we need in the future.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/smp: Coalesce the free_irq calls in one function.
Konrad Rzeszutek Wilk [Tue, 4 Jun 2013 20:31:34 +0000 (16:31 -0400)]
xen/smp: Coalesce the free_irq calls in one function.

There are two functions that do a bunch of 'free_irq' on
the per_cpu IRQ. Instead of having duplicate code just move
it to one function.

This is just code movement.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen-pciback: fix error return code in pcistub_irq_handler_switch()
Wei Yongjun [Fri, 31 May 2013 11:59:20 +0000 (19:59 +0800)]
xen-pciback: fix error return code in pcistub_irq_handler_switch()

Fix to return -ENOENT in the pcistub_device_find() and pci_get_drvdata()
error handling case instead of 0(overwrite to 0 by str_to_slot()), as done
elsewhere in this function.

Acked-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxenbus_client.c: correct exit path for xenbus_map_ring_valloc_hvm
Wei Liu [Wed, 29 May 2013 16:02:58 +0000 (17:02 +0100)]
xenbus_client.c: correct exit path for xenbus_map_ring_valloc_hvm

Apparently we should not free page that has not been allocated.
This is b/c alloc_xenballooned_pages will take care of freeing
the page on its own.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen-pciback: more uses of cached MSI-X capability offset
Jan Beulich [Wed, 29 May 2013 12:31:15 +0000 (13:31 +0100)]
xen-pciback: more uses of cached MSI-X capability offset

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen: Clean up apic ipi interface
Stefan Bader [Wed, 8 May 2013 14:37:35 +0000 (16:37 +0200)]
xen: Clean up apic ipi interface

Commit f447d56d36af18c5104ff29dcb1327c0c0ac3634 introduced the
implementation of the PV apic ipi interface. But there were some
odd things (it seems none of which cause really any issue but
maybe they should be cleaned up anyway):
 - xen_send_IPI_mask_allbutself (and by that xen_send_IPI_allbutself)
   ignore the passed in vector and only use the CALL_FUNCTION_SINGLE
   vector. While xen_send_IPI_all and xen_send_IPI_mask use the vector.
 - physflat_send_IPI_allbutself is declared unnecessarily. It is never
   used.

This patch tries to clean up those things.

Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxenbus: save xenstore local status for later use
Aurelien Chartier [Tue, 28 May 2013 17:09:55 +0000 (18:09 +0100)]
xenbus: save xenstore local status for later use

Save the xenstore local status computed in xenbus_init. It can then be used
later to check if xenstored is running in this domain.

Signed-off-by: Aurelien Chartier <aurelien.chartier@citrix.com>
[Changes in v4:
- Change variable name to xen_store_domain_type]
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxenbus: delay xenbus frontend resume if xenstored is not running
Aurelien Chartier [Tue, 28 May 2013 17:09:56 +0000 (18:09 +0100)]
xenbus: delay xenbus frontend resume if xenstored is not running

If the xenbus frontend is located in a domain running xenstored, the device
resume is hanging because it is happening before the process resume. This
patch adds extra logic to the resume code to check if we are the domain
running xenstored and delay the resume if needed.

Signed-off-by: Aurelien Chartier <aurelien.chartier@citrix.com>
[Changes in v2:
- Instead of bypassing the resume, process it in a workqueue]
[Changes in v3:
- Add a struct work in xenbus_device to avoid dynamic allocation
- Several small code fixes]
[Changes in v4:
- Use a dedicated workqueue]
[Changes in v5:
- Move create_workqueue error handling to xenbus_frontend_dev_resume]
Acked-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxmem/tmem: fix 'undefined variable' build error.
Frederico Cadete [Sat, 25 May 2013 20:48:57 +0000 (22:48 +0200)]
xmem/tmem: fix 'undefined variable' build error.

In the (not so useful) kernel configuration where CONFIG_SWAP
is undefined and CONFIG_XEN_SELFBALLOONING is defined,
xen_tmem_init would use undefined variable 'static bool frontswap'.

Added #else to have #define frontswap (0) in the case where
CONFIG_FRONTSWAP is not defined.

Signed-off-by: Frederico Cadete <frederico@cadete.eu>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoLinux 3.10-rc2
Linus Torvalds [Mon, 20 May 2013 21:37:38 +0000 (14:37 -0700)]
Linux 3.10-rc2

11 years agoMerge tag 'stable/for-linus-3.10-rc1-tag' of git://git.kernel.org/pub/scm/linux/kerne...
Linus Torvalds [Mon, 20 May 2013 21:25:19 +0000 (14:25 -0700)]
Merge tag 'stable/for-linus-3.10-rc1-tag' of git://git./linux/kernel/git/konrad/xen

Pull Xen fixes from Konrad Rzeszutek Wilk:
 - Regression fix in xen privcmd fixing a memory leak.
 - Add Documentation for tmem driver.
 - Simplify and remove code in the tmem driver.
 - Cleanups.

* tag 'stable/for-linus-3.10-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen: Fixed assignment error in if statement
  xen/xenbus: Fixed over 80 character limit issue
  xen/xenbus: Fixed indentation error in switch case
  xen/tmem: Don't use self[ballooning|shrinking] if frontswap is off.
  xen/tmem: Remove the usage of '[no|]selfballoon' and use 'tmem.selfballooning' bool instead.
  xen/tmem: Remove the usage of 'noselfshrink' and use 'tmem.selfshrink' bool instead.
  xen/tmem: Remove the boot options and fold them in the tmem.X parameters.
  xen/tmem: s/disable_// and change the logic.
  xen/tmem: Fix compile warning.
  xen/tmem: Split out the different module/boot options.
  xen/tmem: Move all of the boot and module parameters to the top of the file.
  xen/tmem: Cleanup. Remove the parts that say temporary.
  xen/privcmd: fix condition in privcmd_close()

11 years agoMerge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck...
Linus Torvalds [Mon, 20 May 2013 18:36:52 +0000 (11:36 -0700)]
Merge tag 'hwmon-for-linus' of git://git./linux/kernel/git/groeck/linux-staging

Pull hwmon fixes from Guenter Roeck:

 - Error path fixes for abituguru and iio_hwmon drivers.

 - Drop erroneously created attributes from nct6775 driver.

 - Drop redundant safety on cache lifetime for tmp401 driver.

 - Add explicit maintainer for LM95234 and TMP401 drivers.

* tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  MAINTAINERS: Add myself as maintainer for LM95234 and TMP401 drivers
  hwmon: (tmp401) Drop redundant safety on cache lifetime
  hwmon: fix error return code in abituguru_probe()
  hwmon: (iio_hwmon) Fix null pointer dereference
  hwmon: (nct6775) Do not create non-existing attributes
  hwmon: (iio_hwmon) Fix missing iio_channel_release_all call if devm_kzalloc fail

11 years agox86: Fix bit corruption at CPU resume time
Linus Torvalds [Mon, 20 May 2013 18:36:03 +0000 (11:36 -0700)]
x86: Fix bit corruption at CPU resume time

In commit 78d77df71510 ("x86-64, init: Do not set NX bits on non-NX
capable hardware") we added the early_pmd_flags that gets the NX bit set
when a CPU supports NX. However, the new variable was marked __initdata,
because the main _use_ of this is in an __init routine.

However, the bit setting happens from secondary_startup_64(), which is
called not only at bootup, but on every secondary CPU start.  Including
resuming from STR and at CPU hotplug time.  So the value cannot be
__initdata.

Reported-bisected-and-tested-by: Michal Hocko <mhocko@suse.cz>
Cc: stable@vger.kernel.org # v3.9
Acked-by: Peter Anvin <hpa@linux.intel.com>
Cc: Fernando Luis Vázquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agoxen: Fixed assignment error in if statement
Lisa Nguyen [Thu, 16 May 2013 05:59:40 +0000 (22:59 -0700)]
xen: Fixed assignment error in if statement

Fixed assignment error in if statement in balloon.c

Signed-off-by: Lisa Nguyen <lisa@xenapiadmin.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/xenbus: Fixed over 80 character limit issue
Lisa Nguyen [Thu, 16 May 2013 06:48:03 +0000 (23:48 -0700)]
xen/xenbus: Fixed over 80 character limit issue

Fixed the format length of the xenbus_backend_ioctl()
function to meet the 80 character limit in
xenbus_dev_backend.c

Signed-off-by: Lisa Nguyen <lisa@xenapiadmin.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoxen/xenbus: Fixed indentation error in switch case
Lisa Nguyen [Thu, 16 May 2013 06:47:11 +0000 (23:47 -0700)]
xen/xenbus: Fixed indentation error in switch case

Fixed the indentation error in the switch case in
xenbus_dev_backend.c

Signed-off-by: Lisa Nguyen <lisa@xenapiadmin.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoMerge tag 'pinctrl-fixes-v3.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Mon, 20 May 2013 14:59:46 +0000 (07:59 -0700)]
Merge tag 'pinctrl-fixes-v3.10-2' of git://git./linux/kernel/git/linusw/linux-pinctrl

Pull pinctrl fixes from Linus Walleij:

 - Three fixes to make the boot path for device tree work properly on
   the Nomadik pin controller.

 - Compile warning fix for the vt8500 driver.

 - Fix error path in pinctrl-single.

 - Free mappings in error path of the Lantiq controller.

 - Documentation fixes.

* tag 'pinctrl-fixes-v3.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
  pinctrl/lantiq: Free mapping configs for both pin and groups
  pinctrl: single: fix error return code in pcs_parse_one_pinctrl_entry()
  pinctrl: generic: Fix typos and clarify comments
  pinctrl: vt8500: Fix incorrect data in WM8750 pinctrl table
  pinctrl: abx500: Rejiggle platform data and DT initialisation
  pinctrl: abx500: Specify failed sub-driver by ID instead of driver_data

11 years agoMerge branch 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
Linus Torvalds [Mon, 20 May 2013 14:58:51 +0000 (07:58 -0700)]
Merge branch 'rc-fixes' of git://git./linux/kernel/git/mmarek/kbuild

Pull kbuild fix from Michal Marek:
 "In an attempt to improve make rpm-pkg, I broke make binrpm-pkg"

* 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  package: Makefile: unbreak binrpm-pkg target

11 years agoMAINTAINERS: Add myself as maintainer for LM95234 and TMP401 drivers
Guenter Roeck [Mon, 20 May 2013 03:44:27 +0000 (20:44 -0700)]
MAINTAINERS: Add myself as maintainer for LM95234 and TMP401 drivers

I wrote the LM95234 driver and extended the TMP401 driver substantially,
and I have hardware to test both, so it makes sense to explicitly
maintain them.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
11 years agoMerge tag 'dm-3.10-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm
Linus Torvalds [Sun, 19 May 2013 19:35:30 +0000 (12:35 -0700)]
Merge tag 'dm-3.10-fixes' of git://git./linux/kernel/git/agk/linux-dm

Pull device mapper fix from Alasdair Kergon:
 "A patch to fix metadata resizing with device-mapper thin devices."

* tag 'dm-3.10-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm:
  dm thin: fix metadata dev resize detection

11 years agodm thin: fix metadata dev resize detection
Alasdair G Kergon [Sun, 19 May 2013 17:57:50 +0000 (18:57 +0100)]
dm thin: fix metadata dev resize detection

Fix detection of the need to resize the dm thin metadata device.

The code incorrectly tried to extend the metadata device when it
didn't need to due to a merging error with patch 24347e9 ("dm thin:
detect metadata device resizing").

  device-mapper: transaction manager: couldn't open metadata space map
  device-mapper: thin metadata: tm_open_with_sm failed
  device-mapper: thin: aborting transaction failed
  device-mapper: thin: switching pool to failure mode

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
11 years agohwmon: (tmp401) Drop redundant safety on cache lifetime
Jean Delvare [Sun, 19 May 2013 14:57:30 +0000 (16:57 +0200)]
hwmon: (tmp401) Drop redundant safety on cache lifetime

time_after (as opposed to time_after_equal) already ensures that the
cache lifetime is at least as much as requested. There is no point in
manually adding another jiffy to that value, and this can confuse the
reader into wrong interpretation.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
11 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux...
Linus Torvalds [Sat, 18 May 2013 18:35:28 +0000 (11:35 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/mason/linux-btrfs

Pull btrfs fixes from Chris Mason:
 "Miao Xie has been very busy, fixing races and enospc problems and many
  other small but important pieces.

  Alexandre Oliva discovered some problems with how our error handling
  was interacting with the block layer and for now has disabled our
  partial handling of sub-page writes.  The real sub-page work is in a
  series of patches from IBM that we still need to integrate and test.
  The code Alexandre has turned off was really incomplete.

  Josef has more error handling fixes and an important fix for the new
  skinny extent format.

  This also has my fix for the tracepoint crash from late in 3.9.  It's
  the first stage in a larger clean up to get rid of btrfs_bio and make
  a proper bioset for all the items we need to tack into the bio.  For
  now the bioset only holds our mirror_num and stripe_index, but for the
  next merge window I'll shuffle more in."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (25 commits)
  Btrfs: use a btrfs bioset instead of abusing bio internals
  Btrfs: make sure roots are assigned before freeing their nodes
  Btrfs: explicitly use global_block_rsv for quota_tree
  btrfs: do away with non-whole_page extent I/O
  Btrfs: don't invoke btrfs_invalidate_inodes() in the spin lock context
  Btrfs: remove BUG_ON() in btrfs_read_fs_tree_no_radix()
  Btrfs: pause the space balance when remounting to R/O
  Btrfs: fix unprotected root node of the subvolume's inode rb-tree
  Btrfs: fix accessing a freed tree root
  Btrfs: return errno if possible when we fail to allocate memory
  Btrfs: update the global reserve if it is empty
  Btrfs: don't steal the reserved space from the global reserve if their space type is different
  Btrfs: optimize the error handle of use_block_rsv()
  Btrfs: don't use global block reservation for inode cache truncation
  Btrfs: don't abort the current transaction if there is no enough space for inode cache
  Correct allowed raid levels on balance.
  Btrfs: fix possible memory leak in replace_path()
  Btrfs: fix possible memory leak in the find_parent_nodes()
  Btrfs: don't allow device replace on RAID5/RAID6
  Btrfs: handle running extent ops with skinny metadata
  ...

11 years agoMerge branch 'devm_no_resource_check' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 18 May 2013 17:54:54 +0000 (10:54 -0700)]
Merge branch 'devm_no_resource_check' of git://git./linux/kernel/git/wsa/linux

Pull devm usage cleanup from Wolfram Sang:
 "Lately, I have been experimenting how to improve the devm interface to
  make writing device drivers easier and less error prone while also
  getting rid of its subtle issues.  I think it has more potential but
  still needs work and definately conistency, especiall in its usage.

  The first thing I come up with is a low hanging fruit regarding
  devm_ioremap_resouce().  This function already checks if the passed
  resource is valid and gives an error message if not.  So, we can
  remove similar checks from the drivers and get rid of a bit of code
  and a number of inconsistent error strings.

  This series only removes the unneeded check iff devm_ioremap_resource
  follows platform_get_resource directly.  The previous version tried to
  shuffle code if needed, too, what lead to an embarrasing bug.  It
  turned out to me that shuffling code for all cases found will make the
  automated script too complex, so I am unsure if an automated cleanup
  is the proper tool for this case.  Removing the easy stuff seems
  worthwhile to me, though.

  Despite various architectures and platform dependencies, I managed to
  compile test 45 out of 57 modified files locally using heuristics and
  defconfigs."

Pulled because: 296 deletions, 0 additions.

* 'devm_no_resource_check' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (33 commits)
  sound/soc/kirkwood: don't check resource with devm_ioremap_resource
  sound/soc/fsl: don't check resource with devm_ioremap_resource
  arch/mips/lantiq/xway: don't check resource with devm_ioremap_resource
  arch/arm/plat-samsung: don't check resource with devm_ioremap_resource
  arch/arm/mach-tegra: don't check resource with devm_ioremap_resource
  drivers/watchdog: don't check resource with devm_ioremap_resource
  drivers/w1/masters: don't check resource with devm_ioremap_resource
  drivers/video/omap2/dss: don't check resource with devm_ioremap_resource
  drivers/video/omap2: don't check resource with devm_ioremap_resource
  drivers/usb/phy: don't check resource with devm_ioremap_resource
  drivers/usb/host: don't check resource with devm_ioremap_resource
  drivers/usb/gadget: don't check resource with devm_ioremap_resource
  drivers/usb/chipidea: don't check resource with devm_ioremap_resource
  drivers/thermal: don't check resource with devm_ioremap_resource
  drivers/staging/nvec: don't check resource with devm_ioremap_resource
  drivers/staging/dwc2: don't check resource with devm_ioremap_resource
  drivers/spi: don't check resource with devm_ioremap_resource
  drivers/rtc: don't check resource with devm_ioremap_resource
  drivers/pwm: don't check resource with devm_ioremap_resource
  drivers/pinctrl: don't check resource with devm_ioremap_resource
  ...

11 years agoMerge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux
Linus Torvalds [Sat, 18 May 2013 17:46:50 +0000 (10:46 -0700)]
Merge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux

Pull device tree fixes from Grant Likely:
 "Device tree bug fixes and documentation updates for v3.10

  Nothing earth shattering here.  A build failure fix, and fix for
  releasing nodes and some documenation updates."

* tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux:
  Documentation/devicetree: make semantic of initrd-end more explicit
  of/base: release the node correctly in of_parse_phandle_with_args()
  of/documentation: move video device bindings to a common place
  <linux/of_platform.h>: fix compilation warnings with DT disabled

11 years agoMerge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
Linus Torvalds [Sat, 18 May 2013 17:36:37 +0000 (10:36 -0700)]
Merge branch 'upstream' of git://git.linux-mips.org/ralf/upstream-linus

Pull MIPS fixes from Ralf Baechle:
 "Patching up across the field.  The reversion of the two ASID patches
  is particularly important as it was breaking many platforms."

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  MIPS: ralink: use the dwc2 driver for the rt305x USB controller
  MIPS: Extract schedule_mfi info from __schedule
  MIPS: Fix sibling call handling in get_frame_info
  MIPS: MSP71xx: remove inline marking of EXPORT_SYMBOL functions
  MIPS: Make virt_to_phys() work for all unmapped addresses.
  MIPS: Fix build error for crash_dump.c in 3.10-rc1
  MIPS: Xway: Fix clk leak
  Revert "MIPS: Allow ASID size to be determined at boot time."
  Revert "MIPS: microMIPS: Support dynamic ASID sizing."

11 years agoMerge tag 'kmemleak-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas...
Linus Torvalds [Sat, 18 May 2013 17:21:32 +0000 (10:21 -0700)]
Merge tag 'kmemleak-fixes' of git://git./linux/kernel/git/cmarinas/linux-aarch64

Pull kmemleak patches from Catalin Marinas:
 "Kmemleak now scans all the writable and non-executable module sections
  to avoid false positives (previously it was only scanning specific
  sections and missing .ref.data)."

* tag 'kmemleak-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64:
  kmemleak: No need for scanning specific module sections
  kmemleak: Scan all allocated, writeable and not executable module sections

11 years agoMerge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas...
Linus Torvalds [Sat, 18 May 2013 17:20:46 +0000 (10:20 -0700)]
Merge tag 'arm64-fixes' of git://git./linux/kernel/git/cmarinas/linux-aarch64

Pull arm64 fixes from Catalin Marinas:
 "Fixes for duplicate definition of early_console, kernel/time/Kconfig
  include, __flush_dcache_all() set/way computing, debug (locking, bit
  testing).  The of_platform_populate() was moved to an arch_init_call()
  to allow subsys_init_call() drivers to probe the DT."

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64:
  arm64: debug: fix mdscr.ss check when enabling debug exceptions
  arm64: Do not source kernel/time/Kconfig explicitly
  arm64: mm: Fix operands of clz in __flush_dcache_all
  arm64: Invoke the of_platform_populate() at arch_initcall() level
  arm64: debug: clear mdscr_el1 instead of taking the OS lock
  arm64: Fix duplicate definition of early_console

11 years agosound/soc/kirkwood: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:57 +0000 (15:19 +0200)]
sound/soc/kirkwood: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agosound/soc/fsl: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:57 +0000 (15:19 +0200)]
sound/soc/fsl: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agoarch/mips/lantiq/xway: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:56 +0000 (15:19 +0200)]
arch/mips/lantiq/xway: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: John Crispin <blogic@openwrt.org>
11 years agoarch/arm/plat-samsung: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:55 +0000 (15:19 +0200)]
arch/arm/plat-samsung: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agoarch/arm/mach-tegra: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:55 +0000 (15:19 +0200)]
arch/arm/mach-tegra: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
11 years agodrivers/watchdog: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:54 +0000 (15:19 +0200)]
drivers/watchdog: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/w1/masters: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:53 +0000 (15:19 +0200)]
drivers/w1/masters: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/video/omap2/dss: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:53 +0000 (15:19 +0200)]
drivers/video/omap2/dss: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/video/omap2: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:53 +0000 (15:19 +0200)]
drivers/video/omap2: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/usb/phy: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:53 +0000 (15:19 +0200)]
drivers/usb/phy: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/usb/host: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:52 +0000 (15:19 +0200)]
drivers/usb/host: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
11 years agodrivers/usb/gadget: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:52 +0000 (15:19 +0200)]
drivers/usb/gadget: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/usb/chipidea: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:52 +0000 (15:19 +0200)]
drivers/usb/chipidea: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
11 years agodrivers/thermal: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:51 +0000 (15:19 +0200)]
drivers/thermal: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/staging/nvec: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:51 +0000 (15:19 +0200)]
drivers/staging/nvec: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/staging/dwc2: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:51 +0000 (15:19 +0200)]
drivers/staging/dwc2: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/spi: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:51 +0000 (15:19 +0200)]
drivers/spi: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
11 years agodrivers/rtc: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:50 +0000 (15:19 +0200)]
drivers/rtc: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
11 years agodrivers/pwm: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:50 +0000 (15:19 +0200)]
drivers/pwm: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
11 years agodrivers/pinctrl: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:50 +0000 (15:19 +0200)]
drivers/pinctrl: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/net/ethernet/renesas: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:49 +0000 (15:19 +0200)]
drivers/net/ethernet/renesas: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/mtd/nand: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:49 +0000 (15:19 +0200)]
drivers/mtd/nand: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/misc: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:49 +0000 (15:19 +0200)]
drivers/misc: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/mfd: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:49 +0000 (15:19 +0200)]
drivers/mfd: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/memory: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:48 +0000 (15:19 +0200)]
drivers/memory: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/i2c/busses: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:48 +0000 (15:19 +0200)]
drivers/i2c/busses: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Barry Song <Baohua.Song@csr.com>
11 years agodrivers/gpu/host1x/drm: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:47 +0000 (15:19 +0200)]
drivers/gpu/host1x/drm: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/gpu/drm/exynos: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:47 +0000 (15:19 +0200)]
drivers/gpu/drm/exynos: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
11 years agodrivers/gpio: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:47 +0000 (15:19 +0200)]
drivers/gpio: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
11 years agodrivers/dma: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:47 +0000 (15:19 +0200)]
drivers/dma: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
11 years agodrivers/cpufreq: don't check resource with devm_ioremap_resource
Wolfram Sang [Sun, 12 May 2013 13:19:46 +0000 (15:19 +0200)]
drivers/cpufreq: don't check resource with devm_ioremap_resource

devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
11 years agoMerge branch 'for-chris' of git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs...
Chris Mason [Sat, 18 May 2013 01:53:17 +0000 (21:53 -0400)]
Merge branch 'for-chris' of git://git./linux/kernel/git/josef/btrfs-next

11 years agoBtrfs: use a btrfs bioset instead of abusing bio internals
Chris Mason [Fri, 17 May 2013 22:30:14 +0000 (18:30 -0400)]
Btrfs: use a btrfs bioset instead of abusing bio internals

Btrfs has been pointer tagging bi_private and using bi_bdev
to store the stripe index and mirror number of failed IOs.

As bios bubble back up through the call chain, we use these
to decide if and how to retry our IOs.  They are also used
to count IO failures on a per device basis.

Recently a bio tracepoint was added lead to crashes because
we were abusing bi_bdev.

This commit adds a btrfs bioset, and creates explicit fields
for the mirror number and stripe index.  The plan is to
extend this structure for all of the fields currently in
struct btrfs_bio, which will mean one less kmalloc in
our IO path.

Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Reported-by: Tejun Heo <tj@kernel.org>
11 years agoBtrfs: make sure roots are assigned before freeing their nodes
Josef Bacik [Fri, 17 May 2013 18:06:51 +0000 (14:06 -0400)]
Btrfs: make sure roots are assigned before freeing their nodes

If we fail to load the chunk tree we'll call free_root_pointers, except we may
not have assigned the roots for the dev_root/extent_root/csum_root yet, so we
could NULL pointer deref at this point.  Just add checks to make sure these
roots are set to keep us from panicing.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: explicitly use global_block_rsv for quota_tree
Stefan Behrens [Thu, 16 May 2013 14:48:19 +0000 (14:48 +0000)]
Btrfs: explicitly use global_block_rsv for quota_tree

The quota_tree was set up to use the empty_block_rsv before
which would be problematic when the filesystem is filled up
and ENOSPC happens during internal operations while the quota
tree is updated and COWed (when the btrfs_qgroup_info_item
items) are written. In fact, use_block_rsv() which is used
in btrfs_cow_block() falls back to the global_block_rsv in
this case. But just in order to make it more clear what is
happening, change it to explicitly use the global_block_rsv.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agobtrfs: do away with non-whole_page extent I/O
Alexandre Oliva [Wed, 15 May 2013 15:38:55 +0000 (11:38 -0400)]
btrfs: do away with non-whole_page extent I/O

end_bio_extent_readpage computes whole_page based on bv_offset and
bv_len, without taking into account that blk_update_request may modify
them when some of the blocks to be read into a page produce a read
error.  This would cause the read to unlock only part of the file
range associated with the page, which would in turn leave the entire
page locked, which would not only keep the process blocked instead of
returning -EIO to it, but also prevent any further access to the file.

It turns out that btrfs always issues whole-page reads and writes.
The special handling of non-whole_page appears to be a mistake or a
left-over from a time when this wasn't the case.  Indeed,
end_bio_extent_writepage distinguished between whole_page and
non-whole_page writes but behaved identically in both cases!

I've replaced the whole_page computations with warnings, just to be
sure that we're not issuing partial page reads or writes.  The
warnings should probably just go away some time.

Signed-off-by: Alexandre Oliva <oliva@gnu.org>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: don't invoke btrfs_invalidate_inodes() in the spin lock context
Miao Xie [Wed, 15 May 2013 07:48:21 +0000 (07:48 +0000)]
Btrfs: don't invoke btrfs_invalidate_inodes() in the spin lock context

btrfs_invalidate_inodes() may sleep, so we should not invoke it in the
spin lock context. Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: remove BUG_ON() in btrfs_read_fs_tree_no_radix()
Miao Xie [Wed, 15 May 2013 07:48:18 +0000 (07:48 +0000)]
Btrfs: remove BUG_ON() in btrfs_read_fs_tree_no_radix()

We have checked if ->node is NULL or not, so it is unnecessary to
use BUG_ON() to check again. Remove it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: pause the space balance when remounting to R/O
Miao Xie [Wed, 15 May 2013 07:48:17 +0000 (07:48 +0000)]
Btrfs: pause the space balance when remounting to R/O

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: fix unprotected root node of the subvolume's inode rb-tree
Miao Xie [Wed, 15 May 2013 07:48:16 +0000 (07:48 +0000)]
Btrfs: fix unprotected root node of the subvolume's inode rb-tree

The root node of the rb-tree may be changed, so we should get it under
the lock. Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: fix accessing a freed tree root
Miao Xie [Wed, 15 May 2013 07:48:15 +0000 (07:48 +0000)]
Btrfs: fix accessing a freed tree root

inode_tree_del() will move the tree root into the dead root list, and
then the tree will be destroyed by the cleaner. So if we remove the
delayed node which is cached in the inode after inode_tree_del(),
we may access a freed tree root. Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: return errno if possible when we fail to allocate memory
Liu Bo [Tue, 14 May 2013 02:12:15 +0000 (02:12 +0000)]
Btrfs: return errno if possible when we fail to allocate memory

We need to set return value explicitly, otherwise we'll lose the error
value.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: update the global reserve if it is empty
Miao Xie [Mon, 13 May 2013 13:55:12 +0000 (13:55 +0000)]
Btrfs: update the global reserve if it is empty

Before applying this patch, we reserved the space for the global reserve
by the minimum unit if we found it is empty, it was unreasonable and
inefficient, because if the global reserve space was depleted, it implied
that the size of the global reserve was too small. In this case, we shoud
update the global reserve and fill it.

Cc: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: don't steal the reserved space from the global reserve if their space type...
Miao Xie [Mon, 13 May 2013 13:55:11 +0000 (13:55 +0000)]
Btrfs: don't steal the reserved space from the global reserve if their space type is different

If the type of the space we need is different with the global reserve, we
can not steal the space from the global reserve, because we can not allocate
the space from the free space cache that the global reserve points to.

Cc: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: optimize the error handle of use_block_rsv()
Miao Xie [Mon, 13 May 2013 13:55:10 +0000 (13:55 +0000)]
Btrfs: optimize the error handle of use_block_rsv()

cc: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: don't use global block reservation for inode cache truncation
Miao Xie [Mon, 13 May 2013 13:55:09 +0000 (13:55 +0000)]
Btrfs: don't use global block reservation for inode cache truncation

It is very likely that there are lots of subvolumes/snapshots in the filesystem,
so if we use global block reservation to do inode cache truncation, we may hog
all the free space that is reserved in global rsv. So it is better that we do
the free space reservation for inode cache truncation by ourselves.

Cc: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: don't abort the current transaction if there is no enough space for inode...
Miao Xie [Mon, 13 May 2013 13:55:08 +0000 (13:55 +0000)]
Btrfs: don't abort the current transaction if there is no enough space for inode cache

The filesystem with inode cache was forced to be read-only when we umounted it.

Steps to reproduce:
 # mkfs.btrfs -f ${DEV}
 # mount -o inode_cache ${DEV} ${MNT}
 # dd if=/dev/zero of=${MNT}/file1 bs=1M count=8192
 # btrfs fi syn ${MNT}
 # dd if=${MNT}/file1 of=/dev/null bs=1M
 # rm -f ${MNT}/file1
 # btrfs fi syn ${MNT}
 # umount ${MNT}

It is because there was no enough space to do inode cache truncation, and then
we aborted the current transaction.

But no space error is not a serious problem when we write out the inode cache,
and it is safe that we just skip this step if we meet this problem. So we need
not abort the current transaction.

Reported-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Tested-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoCorrect allowed raid levels on balance.
Andreas Philipp [Sat, 11 May 2013 11:13:03 +0000 (11:13 +0000)]
Correct allowed raid levels on balance.

Raid5 with 3 devices is well defined while the old logic allowed
raid5 only with a minimum of 4 devices when converting the block group
profile via btrfs balance. Creating a raid5 with just three devices
using mkfs.btrfs worked always as expected. This is now fixed and the
whole logic is rewritten.

Signed-off-by: Andreas Philipp <philipp.andreas@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: fix possible memory leak in replace_path()
Stefan Behrens [Wed, 8 May 2013 08:56:09 +0000 (08:56 +0000)]
Btrfs: fix possible memory leak in replace_path()

In replace_path(), if read_tree_block() fails, we cannot return
directly, we should free some allocated memory otherwise memory
leak happens.

Similar to Wang's "Btrfs: fix possible memory leak in the
find_parent_nodes()" patch, the current commit fixes an issue that
is related to the "Btrfs: fix all callers of read_tree_block"
commit.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: fix possible memory leak in the find_parent_nodes()
Wang Shilong [Wed, 8 May 2013 08:10:25 +0000 (08:10 +0000)]
Btrfs: fix possible memory leak in the find_parent_nodes()

In the find_parent_nodes(), if read_tree_block() fails, we can
not return directly, we should free some allocated memory otherwise
memory leak happens.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
11 years agoBtrfs: don't allow device replace on RAID5/RAID6
Stefan Behrens [Tue, 7 May 2013 17:28:03 +0000 (17:28 +0000)]
Btrfs: don't allow device replace on RAID5/RAID6

This is not yet supported and causes crashes. One sad user reported
that it destroyed his filesystem.

One failure is in __btrfs_map_block+0xc1f calling kmalloc(0).

0x5f21f is in __btrfs_map_block (fs/btrfs/volumes.c:4923).
4918                            num_stripes = map->num_stripes;
4919                            max_errors = nr_parity_stripes(map);
4920
4921                            raid_map = kmalloc(sizeof(u64) * num_stripes,
4922                                               GFP_NOFS);
4923                            if (!raid_map) {
4924                                    ret = -ENOMEM;
4925                                    goto out;
4926                            }
4927

There might be more issues. Until this is really tested, don't allow
users to start the procedure on RAID5/RAID6 filesystems.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>