Commit Graph

457030 Commits

Author SHA1 Message Date
Shengjiu Wang
f4a43caba7 ASoC: fsl_ssi: refine ipg clock usage in this module
Check if ipg clock is in clock-names property, then we can move the
ipg clock enable and disable operation to startup and shutdown, that
is only enable ipg clock when ssi is working and keep clock is disabled
when ssi is in idle.
But when the checking is failed, remain the clock control as before.

Tested-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2014-09-17 11:30:15 -07:00
Fabio Falzoi
cf4f7fc3e7 ASoC: fsl-ssi: Support for SND_SOC_DAIFMT_CBM_CFS
Add SND_SOC_DAIFMT_CBM_CFS support for Freescale architecture.
Successfully tested on i.MX 6Quad Wandboard and UDOO boards connected to
the pcm1792a codec.
In CBM_CFS mode, when using a sample size of 16 bits, we cannot use
CCSR_SSI_SCR_I2S_MODE_MASTER since we get a frame sync every 16 bits.

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Fabio Falzoi <fabio.falzoi84@gmail.com>
Tested-by: Angelo Adamo <adamo.a60@gmail.com>
Acked-by: Timur Tabi <timur@tabi.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-07 18:45:38 +01:00
Mark Brown
ae34a78c43 Merge remote-tracking branch 'asoc/topic/wm8985' into asoc-next 2014-08-04 16:32:25 +01:00
Mark Brown
e99a866c4c Merge remote-tracking branches 'asoc/topic/tlv320aic3x', 'asoc/topic/width', 'asoc/topic/wm0010', 'asoc/topic/wm8904' and 'asoc/topic/wm8962' into asoc-next 2014-08-04 16:32:18 +01:00
Mark Brown
c5e64c7636 Merge remote-tracking branches 'asoc/topic/tlv', 'asoc/topic/tlv320aic23', 'asoc/topic/tlv320aic31xx' and 'asoc/topic/tlv320aic32x4' into asoc-next 2014-08-04 16:32:12 +01:00
Mark Brown
3510a69495 Merge remote-tracking branches 'asoc/topic/sigmadsp', 'asoc/topic/sirf', 'asoc/topic/spdif', 'asoc/topic/tas2552' and 'asoc/topic/tas5086' into asoc-next 2014-08-04 16:32:07 +01:00
Mark Brown
c1bd940afd Merge remote-tracking branches 'asoc/topic/rt5670', 'asoc/topic/rt5677', 'asoc/topic/s6000', 'asoc/topic/samsung' and 'asoc/topic/sh-fsi' into asoc-next 2014-08-04 16:32:01 +01:00
Mark Brown
b0ae27c477 Merge remote-tracking branches 'asoc/topic/rl6231', 'asoc/topic/rockchip', 'asoc/topic/rt286', 'asoc/topic/rt5640' and 'asoc/topic/rt5645' into asoc-next 2014-08-04 16:31:55 +01:00
Mark Brown
6aa63a25c0 Merge remote-tracking branches 'asoc/topic/omap', 'asoc/topic/oom' and 'asoc/topic/pxa' into asoc-next 2014-08-04 16:31:50 +01:00
Mark Brown
a6ce305207 Merge remote-tracking branches 'asoc/topic/intel', 'asoc/topic/kirkwood', 'asoc/topic/max98090' and 'asoc/topic/mc13783' into asoc-next 2014-08-04 16:31:45 +01:00
Mark Brown
e7177999dc Merge remote-tracking branches 'asoc/topic/fsl', 'asoc/topic/fsl-asrc', 'asoc/topic/fsl-spdif' and 'asoc/topic/imx-audmux' into asoc-next 2014-08-04 16:31:40 +01:00
Mark Brown
01954a7b67 Merge remote-tracking branches 'asoc/topic/cs4265', 'asoc/topic/cs42l56', 'asoc/topic/cs42xx8', 'asoc/topic/cx20442' and 'asoc/topic/davinci' into asoc-next 2014-08-04 16:31:33 +01:00
Mark Brown
62e951ea65 Merge remote-tracking branches 'asoc/topic/atmel', 'asoc/topic/cirrus' and 'asoc/topic/cleanup' into asoc-next 2014-08-04 16:31:29 +01:00
Mark Brown
a486f183da Merge remote-tracking branches 'asoc/topic/adau1977', 'asoc/topic/ak4642', 'asoc/topic/ak5386' and 'asoc/topic/arizona' into asoc-next 2014-08-04 16:31:23 +01:00
Mark Brown
2fd5373467 Merge remote-tracking branch 'asoc/topic/rcar' into asoc-next 2014-08-04 16:31:20 +01:00
Mark Brown
0e76ee41fc Merge remote-tracking branch 'asoc/topic/pcm1792' into asoc-next 2014-08-04 16:31:19 +01:00
Mark Brown
3a2ac12f8e Merge remote-tracking branch 'asoc/topic/dma' into asoc-next 2014-08-04 16:31:18 +01:00
Mark Brown
7196be58ca Merge remote-tracking branch 'asoc/topic/core' into asoc-next 2014-08-04 16:31:17 +01:00
Mark Brown
a1cb98ac8b Merge remote-tracking branch 'asoc/topic/component' into asoc-next 2014-08-04 16:31:15 +01:00
Mark Brown
7c08152891 Merge remote-tracking branch 'asoc/fix/tlv320aic31xx' into asoc-linus 2014-08-04 16:31:13 +01:00
Mark Brown
3674b710a7 Merge remote-tracking branch 'asoc/fix/fsl-sai' into asoc-linus 2014-08-04 16:31:12 +01:00
Mark Brown
0b773b202d Merge remote-tracking branch 'asoc/fix/arizona' into asoc-linus 2014-08-04 16:31:10 +01:00
Mark Brown
f0d766adbc ASoC: Fixes for v3.16
A bigger batch of changes than I would like as I didn't send any for a
 few weeks without noticing how many had built up.  They are almost all
 driver specific though, larger changes are:
 
  - Fixes to the newly added Baytrail/MAX98090 which look like some QA
    was missed on the microphone detection.
  - Deletion of some erroniously listed audio formats for Haswell.
  - Fix debugfs creation in the core so that we don't try to generate
    multiple directories with the same name, relatively large textually
    but simple to inspect by eye and test.
  - A couple of bugfixes for the rcar driver one of which which involves
    a bit of code motion to move initailisation of some hardware out of
    common paths into device specific ones.
  - Ensure both channels are powered up for mono outputs on Arizona
    devices, involving some simple data tables listing the outputs and a
    loop over them.
  - A couple of fixes to save and restore information on suspended and
    idle Samsung I2S controllers.
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Merge tag 'asoc-v3.16-rc5' into asoc-linus

ASoC: Fixes for v3.16

A bigger batch of changes than I would like as I didn't send any for a
few weeks without noticing how many had built up.  They are almost all
driver specific though, larger changes are:

 - Fixes to the newly added Baytrail/MAX98090 which look like some QA
   was missed on the microphone detection.
 - Deletion of some erroniously listed audio formats for Haswell.
 - Fix debugfs creation in the core so that we don't try to generate
   multiple directories with the same name, relatively large textually
   but simple to inspect by eye and test.
 - A couple of bugfixes for the rcar driver one of which which involves
   a bit of code motion to move initailisation of some hardware out of
   common paths into device specific ones.
 - Ensure both channels are powered up for mono outputs on Arizona
   devices, involving some simple data tables listing the outputs and a
   loop over them.
 - A couple of fixes to save and restore information on suspended and
   idle Samsung I2S controllers.

# gpg: Signature made Tue 22 Jul 2014 00:52:53 BST using RSA key ID 7EA229BD
# gpg: Good signature from "Mark Brown <broonie@sirena.org.uk>"
# gpg:                 aka "Mark Brown <broonie@debian.org>"
# gpg:                 aka "Mark Brown <broonie@kernel.org>"
# gpg:                 aka "Mark Brown <broonie@tardis.ed.ac.uk>"
# gpg:                 aka "Mark Brown <broonie@linaro.org>"
# gpg:                 aka "Mark Brown <Mark.Brown@linaro.org>"
2014-08-04 16:31:05 +01:00
Mark Brown
4a226ec97d ASoC: Fixes for v3.16
Quite a few build coverage fixes in here among the usual small driver
 fixes includling the sigmadsp change from Lars - moving the driver to
 separate modules per bus (which is basically just code motion) avoids
 issues with some combinations of buses being enabled.
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Merge tag 'asoc-v3.16-rc1' into asoc-linus

ASoC: Fixes for v3.16

Quite a few build coverage fixes in here among the usual small driver
fixes includling the sigmadsp change from Lars - moving the driver to
separate modules per bus (which is basically just code motion) avoids
issues with some combinations of buses being enabled.

# gpg: Signature made Thu 19 Jun 2014 11:57:31 BST using RSA key ID 7EA229BD
# gpg: Good signature from "Mark Brown <broonie@sirena.org.uk>"
# gpg:                 aka "Mark Brown <broonie@debian.org>"
# gpg:                 aka "Mark Brown <broonie@kernel.org>"
# gpg:                 aka "Mark Brown <broonie@tardis.ed.ac.uk>"
# gpg:                 aka "Mark Brown <broonie@linaro.org>"
# gpg:                 aka "Mark Brown <Mark.Brown@linaro.org>"
2014-08-04 16:31:03 +01:00
Mark Brown
e5f89768e9 ASoC: imx-audmux: Use uintptr_t for port numbers
Since we pass the port number through file private data for debugfs we cast
it to and from a pointer so use uintptr_t in order to ensure that the
types are compatible, avoiding warnings on 64 bit platforms where pointers
are 64 bit and unsigned integers 32 bit.

Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-04 16:30:24 +01:00
Peter Ujfalusi
37119dd791 ASoC: davinci: Enable menuconfig entry for McASP
In order to be able to use simple-card with McASP on TI SoC based boards we
need to be able to select the McASP via menuconfig.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-04 16:28:30 +01:00
Nicolin Chen
4e13eb7221 ASoC: fsl_asrc: Don't access members of config before checking it
sound/soc/fsl/fsl_asrc.c:250 fsl_asrc_config_pair()
	warn: variable dereferenced before check 'config' (see line 243)

git remote add next git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
git remote update next
git checkout 3117bb3109
vim +/config +250 sound/soc/fsl/fsl_asrc.c

  237   */
  238  static int fsl_asrc_config_pair(struct fsl_asrc_pair *pair)
  239  {
  240   struct asrc_config *config = pair->config;
  241   struct fsl_asrc *asrc_priv = pair->asrc_priv;
  242   enum asrc_pair_index index = pair->index;
 @243   u32 inrate = config->input_sample_rate, indiv;
  244   u32 outrate = config->output_sample_rate, outdiv;
  245   bool ideal = config->inclk == INCLK_NONE;
  246   u32 clk_index[2], div[2];
  247   int in, out, channels;
  248   struct clk *clk;
  249
 @250   if (!config) {
  251           pair_err("invalid pair config\n");
  252           return -EINVAL;
  253   }

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-04 15:48:41 +01:00
Nicolin Chen
6ccf62c7be ASoC: fsl_sarc_dma: Check pair before using it
The patch 3117bb3109: "ASoC: fsl_asrc: Add ASRC ASoC CPU DAI and
platform drivers" from Jul 29, 2014, leads to the following Smatch
complaint:

sound/soc/fsl/fsl_asrc_dma.c:304 fsl_asrc_dma_shutdown()
warn: variable dereferenced before check 'pair' (see line 302)

sound/soc/fsl/fsl_asrc_dma.c
301          struct fsl_asrc_pair *pair = runtime->private_data;
302          struct fsl_asrc *asrc_priv = pair->asrc_priv;
                                          ^^^^^^^^^^^^^^^
                                            Dereference.

303
304          if (pair && asrc_priv->pair[pair->index] == pair)
                 ^^^^
                Check.

305                  asrc_priv->pair[pair->index] = NULL;
306

So we just let the driver check pair before using it.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-04 15:48:41 +01:00
Mark Brown
d8df26bb57 ASoC: adau1977: Fix truncation warning on 64 bit architectures
Negating ADAU1977_BLOCK_POWER_SAI_LDO_EN creates an unsigned long constant
with all bits set which on 64 bit architectures needs to be truncated to
an unsigned int, generating a warning. Add an explicit cast since we know
this is OK.

Signed-off-by: Mark Brown <broonie@linaro.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
2014-08-04 14:29:45 +01:00
Linus Torvalds
19583ca584 Linux 3.16 2014-08-03 15:25:02 -07:00
Linus Torvalds
8d71844b51 Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fixes from Thomas Gleixner:
 "Two fixes in the timer area:
   - a long-standing lock inversion due to a printk
   - suspend-related hrtimer corruption in sched_clock"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timer: Fix lock inversion between hrtimer_bases.lock and scheduler locks
  sched_clock: Avoid corrupting hrtimer tree during suspend
2014-08-03 09:58:20 -07:00
Linus Torvalds
3f9c08f7ce Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm
Pull ARM fixes from Russell King:
 "A few fixes for ARM.  Some of these are correctness issues:
   - TLBs must be flushed after the old mappings are removed by the DMA
     mapping code, but before the new mappings are established.
   - An off-by-one entry error in the Keystone LPAE setup code.

  Fixes include:
   - ensuring that the identity mapping for LPAE does not remove the
     kernel image from the identity map.
   - preventing userspace from trapping into kgdb.
   - fixing a preemption issue in the Intel iwmmxt code.
   - fixing a build error with nommu.

  Other changes include:
   - Adding a note about which areas of memory are expected to be
     accessible while the identity mapping tables are in place"

* 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  ARM: 8124/1: don't enter kgdb when userspace executes a kgdb break instruction
  ARM: idmap: add identity mapping usage note
  ARM: 8115/1: LPAE: reduce damage caused by idmap to virtual memory layout
  ARM: fix alignment of keystone page table fixup
  ARM: 8112/1: only select ARM_PATCH_PHYS_VIRT if MMU is enabled
  ARM: 8100/1: Fix preemption disable in iwmmxt_task_enable()
  ARM: DMA: ensure that old section mappings are flushed from the TLB
2014-08-02 10:57:39 -07:00
Omar Sandoval
6bf755db4d ARM: 8124/1: don't enter kgdb when userspace executes a kgdb break instruction
The kgdb breakpoint hooks (kgdb_brk_fn and kgdb_compiled_brk_fn)
should only be entered when a kgdb break instruction is executed
from the kernel. Otherwise, if kgdb is enabled, a userspace program
can cause the kernel to drop into the debugger by executing either
KGDB_BREAKINST or KGDB_COMPILED_BREAK.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2014-08-02 15:20:30 +01:00
Russell King
c5cc87fa8d ARM: idmap: add identity mapping usage note
Add a note about the usage of the identity mapping; we do not support
accesses outside of the identity map region and kernel image while a
CPU is using the identity map.  This is because the identity mapping
may overwrite vmalloc space, IO mappings, the vectors pages, etc.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2014-08-02 15:20:26 +01:00
Linus Torvalds
1f2609460c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs fixes from Al Viro:
 "This contains a couple of fixes - one is the aio fix from Christoph,
  the other a fallocate() one from Eric"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  vfs: fix check for fallocate on active swapfile
  direct-io: fix AIO regression
2014-08-01 18:01:41 -07:00
Linus Torvalds
f88cf230a4 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fix from Peter Anvin:
 "A single fix to not invoke the espfix code on Xen PV, as it turns out
  to oops the guest when invoked after all.  This patch leaves some
  amount of dead code, in particular unnecessary initialization of the
  espfix stacks when they won't be used, but in the interest of keeping
  the patch minimal that cleanup can wait for the next cycle"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86_64/entry/xen: Do not invoke espfix64 on Xen
2014-08-01 17:37:01 -07:00
Linus Torvalds
ecb679fc2c Staging driver bugfixes for 3.16-rc8
Here are some tiny staging driver bugfixes that I've had in my tree for
 the past week that resolve some reported issues.  Nothing major at all,
 but it would be good to get them merged for 3.16-rc8 or -final.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'staging-3.16-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging driver bugfixes from Greg KH:
 "Here are some tiny staging driver bugfixes that I've had in my tree
  for the past week that resolve some reported issues.  Nothing major at
  all, but it would be good to get them merged for 3.16-rc8 or -final"

* tag 'staging-3.16-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: vt6655: Fix disassociated messages every 10 seconds
  staging: vt6655: Fix Warning on boot handle_irq_event_percpu.
  staging: rtl8723au: rtw_resume(): release semaphore before exit on error
  iio:bma180: Missing check for frequency fractional part
  iio:bma180: Fix scale factors to report correct acceleration units
  iio: buffer: Fix demux table creation
2014-08-01 17:16:05 -07:00
Linus Torvalds
818be5894e Fix dm bufio shrinker to properly zero-fill all fields.
Fix race in dm cache that caused improper reporting of the number of
 dirty blocks in the cache.
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Merge tag 'dm-3.16-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:
 "Fix dm bufio shrinker to properly zero-fill all fields.

  Fix race in dm cache that caused improper reporting of the number of
  dirty blocks in the cache"

* tag 'dm-3.16-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm cache: fix race affecting dirty block count
  dm bufio: fully initialize shrinker
2014-08-01 12:50:05 -07:00
Linus Torvalds
9642a1041e ARM: Straggler SoC fix for 3.16
A DT bugfix for Nomadik that had an ambigouos double-inversion of a gpio
 line, and one MAINTAINER URL update that might as well go in now.
 
 We could hold off until the merge window, but then we'll just have to mark
 the DT fix for stable and it just seems like in total causing more work.
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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM straggler SoC fix from Olof Johansson:
 "A DT bugfix for Nomadik that had an ambigouos double-inversion of a
  gpio line, and one MAINTAINER URL update that might as well go in now.

  We could hold off until the merge window, but then we'll just have to
  mark the DT fix for stable and it just seems like in total causing
  more work"

* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  MAINTAINERS: Update Tegra Git URL
  ARM: nomadik: fix up double inversion in DT
2014-08-01 12:49:02 -07:00
Mark Brown
019575726e ASoC: rt5670: Fix duplicate const warnings
Since SOC_ENUM_SINGLE_DECL() includes a const as part of the macro adding
an explicit const in the source is duplication and causes sparse to warn.
Remove the extra consts.

Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-01 19:17:05 +01:00
Mark Brown
ff62b95894 ASoC: rt5670: Staticise non-exported symbols
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-01 19:17:04 +01:00
Paweł Piskorski
d6e08617cb ASoC: Intel: update stream only on stream IPC msgs
Only update the stream when the IPC message type matches stream type.

Signed-off-by: Paweł Piskorski <pawel.piskorski@intel.com>
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-01 19:11:29 +01:00
Paweł Piskorski
94ce33456d ASoC: Intel: Don't issue ipc when processing response
Make sure we dont issue IPC when we are processing a response.

Signed-off-by: Paweł Piskorski <pawel.piskorski@intel.com>
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-01 19:11:28 +01:00
Liam Girdwood
97cfc751e1 ASoC: Intel: Delete message when IPC timeout occurs
This fixes a bug where we dont delete the current message when an
IPC message timeout occurs.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-01 19:11:28 +01:00
Jie Yang
4ebd599e35 ASoC: Intel: Add dependency to DW_DMAC for BDW platform
Add dependency to DW_DMAC for broadwell machine, which
have built in DW dma engines.

Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-01 19:11:28 +01:00
Kuninori Morimoto
cd2b65741e ASoC: rsnd: enable Mute control on DVC
DVC can control Mute.
This patch supports it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-01 18:46:25 +01:00
Kuninori Morimoto
486b09c750 ASoC: rsnd: tidyup DVC control method
DVC can use Volume and Mute control,
and these control methods doesn't have much difference.
This patch cleanup current method,
and it will be used for Mute control.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-01 18:46:25 +01:00
Mark Brown
aaed2a62c2 ASoC: cx20442: Fix strange indentation
Signed-off-by: Mark Brown <broonie@linaro.org>
2014-08-01 18:25:22 +01:00
Anssi Hannula
44fa816bb7 dm cache: fix race affecting dirty block count
nr_dirty is updated without locking, causing it to drift so that it is
non-zero (either a small positive integer, or a very large one when an
underflow occurs) even when there are no actual dirty blocks.  This was
due to a race between the workqueue and map function accessing nr_dirty
in parallel without proper protection.

People were seeing under runs due to a race on increment/decrement of
nr_dirty, see: https://lkml.org/lkml/2014/6/3/648

Fix this by using an atomic_t for nr_dirty.

Reported-by: roma1390@gmail.com
Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
2014-08-01 12:25:22 -04:00
Greg Thelen
d8c712ea47 dm bufio: fully initialize shrinker
1d3d4437ea ("vmscan: per-node deferred work") added a flags field to
struct shrinker assuming that all shrinkers were zero filled.  The dm
bufio shrinker is not zero filled, which leaves arbitrary kmalloc() data
in flags.  So far the only defined flags bit is SHRINKER_NUMA_AWARE.
But there are proposed patches which add other bits to shrinker.flags
(e.g. memcg awareness).

Rather than simply initializing the shrinker, this patch uses kzalloc()
when allocating the dm_bufio_client to ensure that the embedded shrinker
and any other similar structures are zeroed.

This fixes theoretical over aggressive shrinking of dm bufio objects.
If the uninitialized dm_bufio_client.shrinker.flags contains
SHRINKER_NUMA_AWARE then shrink_slab() would call the dm shrinker for
each numa node rather than just once.  This has been broken since 3.12.

Signed-off-by: Greg Thelen <gthelen@google.com>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # v3.12+
2014-08-01 12:07:21 -04:00