GitHub/exynos8895/android_kernel_samsung_universal8895.git
11 years agospi: rspi: use platform drvdata correctly in rspi_remove()
Wei Yongjun [Fri, 15 Nov 2013 07:44:02 +0000 (15:44 +0800)]
spi: rspi: use platform drvdata correctly in rspi_remove()

We had set the platform drvdata in rspi_probe() as a type of
struct rspi_data, but use it as struct spi_master in rspi_remove()
Fix by remove the unnecessary spi_master_[get|put]() since rspi->master
is no longer used after spi_unregister_master().

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agoMerge remote-tracking branch 'spi/topic/wr' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:41 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/wr' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/txx9' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:41 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/txx9' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/topcliff' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:40 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/topcliff' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/tegra114' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:40 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/tegra114' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/tegra-slink' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:39 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/tegra-slink' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/tegra' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:39 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/tegra' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/s3c64xx' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:38 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/s3c64xx' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/s3c24xx' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:38 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/s3c24xx' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/rspi' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:37 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/rspi' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/qspi' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:36 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/qspi' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/probe' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:36 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/probe' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/pl022' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:35 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/pl022' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/orion' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:35 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/orion' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/mxs' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:34 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/mxs' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/loop' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:29 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/loop' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/imx' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:29 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/imx' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/hspi' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:28 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/hspi' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/gpio' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:28 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/gpio' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/efm32' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:27 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/efm32' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/dspi' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:27 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/dspi' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/dev' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:26 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/dev' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/designware' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:26 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/designware' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/davinci' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:25 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/davinci' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/core' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:25 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/core' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/clps711x' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:24 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/clps711x' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/butterfly' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:23 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/butterfly' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/bitbang' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:23 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/bitbang' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/bfin' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:21 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/bfin' into spi-next

11 years agoMerge remote-tracking branch 'spi/topic/atmel' into spi-next
Mark Brown [Fri, 25 Oct 2013 08:51:21 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/topic/atmel' into spi-next

11 years agoMerge remote-tracking branch 'spi/fix/s3c64xx' into spi-linus
Mark Brown [Fri, 25 Oct 2013 08:51:20 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/fix/s3c64xx' into spi-linus

11 years agoMerge remote-tracking branch 'spi/fix/modalias' into spi-linus
Mark Brown [Fri, 25 Oct 2013 08:51:19 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/fix/modalias' into spi-linus

11 years agoMerge remote-tracking branch 'spi/fix/mcspi' into spi-linus
Mark Brown [Fri, 25 Oct 2013 08:51:19 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/fix/mcspi' into spi-linus

11 years agoMerge remote-tracking branch 'spi/fix/efm' into spi-linus
Mark Brown [Fri, 25 Oct 2013 08:51:18 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/fix/efm' into spi-linus

11 years agoMerge remote-tracking branch 'spi/fix/atmel' into spi-linus
Mark Brown [Fri, 25 Oct 2013 08:51:17 +0000 (09:51 +0100)]
Merge remote-tracking branch 'spi/fix/atmel' into spi-linus

11 years agospi/hspi: add device tree support
Kuninori Morimoto [Fri, 25 Oct 2013 04:53:29 +0000 (21:53 -0700)]
spi/hspi: add device tree support

Support for loading the Renesas HSPI driver via devicetree.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: atmel: fix return value check in atmel_spi_probe()
Wei Yongjun [Mon, 21 Oct 2013 03:12:02 +0000 (11:12 +0800)]
spi: atmel: fix return value check in atmel_spi_probe()

In case of error, the function devm_ioremap_resource() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check should be
replaced with IS_ERR().

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-imx: only enable the clocks when we start to transfer a message
Huang Shijie [Wed, 23 Oct 2013 08:31:50 +0000 (16:31 +0800)]
spi: spi-imx: only enable the clocks when we start to transfer a message

Current code keeps the clocks enabled all the time, it wastes the power
when there is no operaiton on the spi controller.

In order to save the power, this patch adds the two hooks:
   spi_imx_prepare_message: enable the clocks for this message
   spi_imx_unprepare_message: disable the clocks.

This patch also disables the clocks in the end of the probe.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi/s3c64xx: Fix doubled clock disable on suspend
Krzysztof Kozlowski [Mon, 21 Oct 2013 13:42:50 +0000 (15:42 +0200)]
spi/s3c64xx: Fix doubled clock disable on suspend

Fix doubled clock disable and unprepare during PM suspend which triggered
the warnings:

WARNING: at drivers/clk/clk.c:800 clk_disable+0x18/0x24()
Modules linked in:
CPU: 0 PID: 1745 Comm: sh Not tainted 3.10.14-01211-ge2549bb-dirty #62
[<c0015980>] (unwind_backtrace+0x0/0x138) from [<c0012a44>] (show_stack+0x10/0x14)
[<c0012a44>] (show_stack+0x10/0x14) from [<c0022818>] (warn_slowpath_common+0x4c/0x68)
[<c0022818>] (warn_slowpath_common+0x4c/0x68) from [<c0022850>] (warn_slowpath_null+0x1c/0x24)
[<c0022850>] (warn_slowpath_null+0x1c/0x24) from [<c036e274>] (clk_disable+0x18/0x24)
[<c036e274>] (clk_disable+0x18/0x24) from [<c02d5f78>] (s3c64xx_spi_suspend+0x28/0x54)
[<c02d5f78>] (s3c64xx_spi_suspend+0x28/0x54) from [<c02b3a54>] (platform_pm_suspend+0x2c/0x5c)
[<c02b3a54>] (platform_pm_suspend+0x2c/0x5c) from [<c02b8a30>] (dpm_run_callback+0x44/0x7c)
[<c02b8a30>] (dpm_run_callback+0x44/0x7c) from [<c02b8b70>] (__device_suspend+0x108/0x300)
[<c02b8b70>] (__device_suspend+0x108/0x300) from [<c02ba4e0>] (dpm_suspend+0x54/0x208)
[<c02ba4e0>] (dpm_suspend+0x54/0x208) from [<c0066bcc>] (suspend_devices_and_enter+0x98/0x458)
[<c0066bcc>] (suspend_devices_and_enter+0x98/0x458) from [<c0067150>] (pm_suspend+0x1c4/0x25c)
[<c0067150>] (pm_suspend+0x1c4/0x25c) from [<c0066044>] (state_store+0x6c/0xbc)
[<c0066044>] (state_store+0x6c/0xbc) from [<c0203290>] (kobj_attr_store+0x14/0x20)
[<c0203290>] (kobj_attr_store+0x14/0x20) from [<c0157530>] (sysfs_write_file+0xfc/0x164)
[<c0157530>] (sysfs_write_file+0xfc/0x164) from [<c00fd6b0>] (vfs_write+0xbc/0x1bc)
[<c00fd6b0>] (vfs_write+0xbc/0x1bc) from [<c00fdaf0>] (SyS_write+0x40/0x68)
[<c00fdaf0>] (SyS_write+0x40/0x68) from [<c000ea80>] (ret_fast_syscall+0x0/0x3c)

The clocks may be already disabled before suspending. Check PM runtime
suspend status and disable clocks only if device is not suspended.
During resume do not enable the clocks if device is runtime suspended.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi/s3c64xx: Do not ignore return value of spi_master_resume/suspend
Krzysztof Kozlowski [Mon, 21 Oct 2013 13:42:49 +0000 (15:42 +0200)]
spi/s3c64xx: Do not ignore return value of spi_master_resume/suspend

During PM resume and suspend do not ignore the return value of
spi_master_suspend() or spi_master_resume(). Instead pass it further.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agoLinux 3.12-rc6
Linus Torvalds [Sat, 19 Oct 2013 19:28:15 +0000 (12:28 -0700)]
Linux 3.12-rc6

11 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux...
Linus Torvalds [Fri, 18 Oct 2013 23:46:21 +0000 (16:46 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/mason/linux-btrfs

Pull btrfs fix from Chris Mason:
 "Sage hit a deadlock with ceph on btrfs, and Josef tracked it down to a
  regression in our initial rc1 pull.  When doing nocow writes we were
  sometimes starting a transaction with locks held"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: release path before starting transaction in can_nocow_extent

11 years agoMerge tag 'pm+acpi-3.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
Linus Torvalds [Fri, 18 Oct 2013 21:26:51 +0000 (14:26 -0700)]
Merge tag 'pm+acpi-3.12-rc6' of git://git./linux/kernel/git/rafael/linux-pm

Pull ACPI and power management fixes from Rafael Wysocki:

 - intel_pstate fix for misbehavior after system resume if sysfs
   attributes are set in a specific way before the corresponding suspend
   from Dirk Brandewie.

 - A recent intel_pstate fix has no effect if unsigned long is 32-bit,
   so fix it up to cover that case as well.

 - The s3c64xx cpufreq driver was not updated when the index field of
   struct cpufreq_frequency_table was replaced with driver_data, so
   update it now.  From Charles Keepax.

 - The Kconfig help text for ACPI_BUTTON still refers to
   /proc/acpi/event that has been dropped recently, so modify it to
   remove that reference.  From Krzysztof Mazur.

 - A Lan Tianyu's change adds a missing mutex unlock to an error code
   path in acpi_resume_power_resources().

 - Some code related to ACPI power resources, whose very purpose is
   questionable to put it lightly, turns out to cause problems to happen
   during testing on real systems, so remove it completely (we may
   revisit that in the future if there's a compelling enough reason).
   From Rafael J Wysocki and Aaron Lu.

* tag 'pm+acpi-3.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / PM: Drop two functions that are not used any more
  ATA / ACPI: remove power dependent device handling
  cpufreq: s3c64xx: Rename index to driver_data
  ACPI / power: Drop automaitc resume of power resource dependent devices
  intel_pstate: Fix type mismatch warning
  cpufreq / intel_pstate: Fix max_perf_pct on resume
  ACPI: remove /proc/acpi/event from ACPI_BUTTON help
  ACPI / power: Release resource_lock after acpi_power_get_state() return error

11 years agoMerge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 18 Oct 2013 19:25:11 +0000 (12:25 -0700)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:
 "Two fixlets:

   - fix a (rare-config) build bug
   - fix a next-gen SGI/UV hw/firmware enumeration bug"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86: Update UV3 hub revision ID
  x86/microcode: Correct Kconfig dependencies

11 years agoBtrfs: release path before starting transaction in can_nocow_extent
Josef Bacik [Fri, 18 Oct 2013 16:10:36 +0000 (12:10 -0400)]
Btrfs: release path before starting transaction in can_nocow_extent

We can't be holding tree locks while we try to start a transaction, we will
deadlock.  Thanks,

Reported-by: Sage Weil <sage@inktank.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
11 years agoMerge branch 'acpi-fixes'
Rafael J. Wysocki [Fri, 18 Oct 2013 11:42:10 +0000 (13:42 +0200)]
Merge branch 'acpi-fixes'

* acpi-fixes:
  ACPI / PM: Drop two functions that are not used any more
  ATA / ACPI: remove power dependent device handling
  ACPI / power: Drop automaitc resume of power resource dependent devices
  ACPI: remove /proc/acpi/event from ACPI_BUTTON help
  ACPI / power: Release resource_lock after acpi_power_get_state() return error

11 years agoMerge branch 'pm-fixes'
Rafael J. Wysocki [Fri, 18 Oct 2013 11:41:56 +0000 (13:41 +0200)]
Merge branch 'pm-fixes'

* pm-fixes:
  cpufreq: s3c64xx: Rename index to driver_data
  intel_pstate: Fix type mismatch warning
  cpufreq / intel_pstate: Fix max_perf_pct on resume

11 years agoMerge branch 'for-linus' of git://git.samba.org/sfrench/cifs-2.6
Linus Torvalds [Fri, 18 Oct 2013 01:49:21 +0000 (18:49 -0700)]
Merge branch 'for-linus' of git://git.samba.org/sfrench/cifs-2.6

Pull CIFS fixes from Steve French:
 "Five small cifs fixes (includes fixes for: unmount hang, 2 security
  related, symlink, large file writes)"

* 'for-linus' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: ntstatus_to_dos_map[] is not terminated
  cifs: Allow LANMAN auth method for servers supporting unencapsulated authentication methods
  cifs: Fix inability to write files >2GB to SMB2/3 shares
  cifs: Avoid umount hangs with smb2 when server is unresponsive
  do not treat non-symlink reparse points as valid symlinks

11 years agospi: spi-mxs: Use u32 instead of uint32_t
Trent Piepho [Tue, 1 Oct 2013 20:15:54 +0000 (13:15 -0700)]
spi: spi-mxs: Use u32 instead of uint32_t

It's consistent with all the other spi drivers that way.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-mxs: Don't set clock for each xfer
Trent Piepho [Tue, 1 Oct 2013 20:15:47 +0000 (13:15 -0700)]
spi: spi-mxs: Don't set clock for each xfer

mxs_spi_setup_transfer() would set the SSP SCK rate every time it was
called, which is before every transfer.  It is uncommon for the SCK rate to
change between transfers (or at all of that matter) and this causes many
unnecessary reprogrammings of the clock registers.

Code changed to only set the rate when it changes.  This significantly
speeds up short SPI messages, especially messages made up of many transfers,
as the calculation of the clock divisors is rather costly.  On an iMX287,
using spidev with messages that consist of 511 transfers of 4 bytes each at
an SCK of 48 MHz, the effective transfer rate more than doubles from about
290 KB/sec to 600 KB/sec!

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-mxs: Clean up setup_transfer function
Trent Piepho [Tue, 1 Oct 2013 20:15:40 +0000 (13:15 -0700)]
spi: spi-mxs: Clean up setup_transfer function

It can't be called with a NULL transfer anymore so it can be simplified
to not check for that.

Fix indention of line-wrapped code to Linux standard.

The transfer pointer can be const.

It's not necessary to check if the spi_transfer's speed_hz is zero, as
the spi core also fills it in from the spi_device.  However, the spi
core does not check if spi_device's speed is zero so we have to do
that still.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-mxs: Remove check of spi mode bits
Trent Piepho [Tue, 1 Oct 2013 20:15:33 +0000 (13:15 -0700)]
spi: spi-mxs: Remove check of spi mode bits

The spi core already checks for a slave setting mode bits that we
didn't list as supported when the master was registered.  There is no
need to do it again in the master driver.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-mxs: Fix race in setup method
Trent Piepho [Tue, 1 Oct 2013 20:15:25 +0000 (13:15 -0700)]
spi: spi-mxs: Fix race in setup method

Despite many warnings in the SPI documentation and code, the spi-mxs
driver sets shared chip registers in the ->setup method.  This method can
be called when transfers are in progress on other slaves controlled by the
master.  Setting registers or any other shared state will corrupt those
transfers.

So fix mxs_spi_setup() to not call mxs_spi_setup_transfer().
mxs_spi_setup_transfer() is already called for each transfer when they
are actually performed in mxs_spi_transfer_one(), so the call in
mxs_spi_setup() isn't necessary to setup anything.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-mxs: Remove bogus setting of ssp clk rate field
Trent Piepho [Tue, 1 Oct 2013 20:15:18 +0000 (13:15 -0700)]
spi: spi-mxs: Remove bogus setting of ssp clk rate field

The ssp struct has a clock rate field, to provide the actual value, in Hz,
of the SSP output clock (the rate of SSP_SCK) after mxs_ssp_set_clk_rate()
is called.  It is set by mxs_ssp_set_clk_rate(), for SSP using drivers (like
SPI and MMC) to *read* if they want to know the actual clock rate.  The SPI
driver isn't supposed to *write* to it.

For some reason the spi-mxs driver decides to write to this field on init,
and sets it to the value of the SSP input clock (clk_sspN, from the MXS
clocking block) in kHz.  It shouldn't be setting the value, and certainly
shouldn't be setting it with the wrong clock in the wrong units.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-mxs: Remove full duplex check, spi core already does it
Trent Piepho [Tue, 1 Oct 2013 20:15:11 +0000 (13:15 -0700)]
spi: spi-mxs: Remove full duplex check, spi core already does it

Because the driver sets the SPI_MASTER_HALF_DUPLEX flag, the spi core
will check transfers to insure they are not full duplex.  It's not
necessary to check that in the spi-mxs driver as well.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-mxs: Fix chip select control bits in DMA mode
Trent Piepho [Tue, 1 Oct 2013 20:15:04 +0000 (13:15 -0700)]
spi: spi-mxs: Fix chip select control bits in DMA mode

In DMA mode the chip select control bits would be ORed into the CTRL0
register without first clearing the bits.  This means that after
addressing slave 1, the CTRL0 bit to address slave 1 would be still be
set when addressing slave 0, resulting in slave 1 continuing to be
addressed.

The message handling function would pass the CS value to the txrx
function, which would re-program the bits on each transfer in the
message.  The selected CS does not change during a message so this is
inefficient.  It also means there are two different sets of code for
selecting the CS, one for PIO that worked and one for DMA that didn't.

Change the code to set the CS bits in the message handling function
once.  Now the DMA and PIO txrx functions don't need to care about CS
at all.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-mxs: Fix extra CS pulses and read mode in multi-transfer messages
Trent Piepho [Tue, 1 Oct 2013 20:14:57 +0000 (13:14 -0700)]
spi: spi-mxs: Fix extra CS pulses and read mode in multi-transfer messages

There are two bits which control the CS line in the CTRL0 register:
LOCK_CS and IGNORE_CRC.  The latter would be better named DEASSERT_CS
in SPI mode.

Setting DEASSERT_CS causes CS to be de-asserted at the end of the transfer.
It should normally be set only for the final segment of the final transfer.
The DMA code explicitly sets it in this case, but because it never clears
the bit from the ctrl0 register, it will remain set for all transfers in
subsequent messages.  This results in a CS pulse between transfers.

There is a similar problem with the read mode bit never being cleared
in DMA mode.

This patch fixes DEASSERT_CS and READ being left on in DMA mode.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-mxs: Change flag arguments in txrx functions to bit flags
Trent Piepho [Tue, 1 Oct 2013 20:14:50 +0000 (13:14 -0700)]
spi: spi-mxs: Change flag arguments in txrx functions to bit flags

There are three flag arguments to the PIO and DMA txrx functions.  Two
are passed as pointers to integers, even though they are input only
and not modified, which makes no sense to do.  The third is passed as
an integer.

The compiler must use an argument register or stack variable for each
flag this way.  Using bitflags in a single flag argument is more
efficient and produces smaller code, since all the flags can fit in a
single register.  And all the flag arguments get cumbersome,
especially when more are added for things like GPIO chipselects.

The "first" flag is never used, so can just be deleted.

The "last" flag is renamed to DEASSERT_CS, since that's really what it
does.  The spi_transfer cs_change flag means that CS might be
de-asserted on a transfer which is not last and not de-assert on the
last transfer, so it is not which transfer is the last we need to know
but rather the transfers after which CS should be de-asserted.

This also extends the driver to not ignore cs_change when setting the
DEASSERT_CS nee "last" flag.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-mxs: Always clear INGORE_CRC, to keep CS asserted
Trent Piepho [Tue, 1 Oct 2013 20:14:39 +0000 (13:14 -0700)]
spi: spi-mxs: Always clear INGORE_CRC, to keep CS asserted

INGORE_CRC, better named DEASSERT_CS, should be cleared on all tranfers
except the last.  So instead of only clearing it on the first transfer, we
can just always clear it.  It will set on the last transfer.

This removes the only use of the "first" flag in the transfer functions, so
that flag can be then be removed.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-mxs: Remove mxs_spi_enable and mxs_spi_disable
Trent Piepho [Tue, 1 Oct 2013 20:14:32 +0000 (13:14 -0700)]
spi: spi-mxs: Remove mxs_spi_enable and mxs_spi_disable

These functions consist of nothing but one single writel call and are
only called once.  And the names really aren't accurate or clear,
since they don't enable or disble SPI.  Rather they set the bit that
controls the state of CS at the end of transfer.  It easier to follow
the code to just set this bit with a writel() along with all the other
bits being set in the same function.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi: spi-mxs: Always set LOCK_CS
Trent Piepho [Tue, 1 Oct 2013 20:14:25 +0000 (13:14 -0700)]
spi: spi-mxs: Always set LOCK_CS

There are two bits which control the CS line in the CTRL0 register:
LOCK_CS and IGNORE_CRC.  The latter would be better named DEASSERT_CS
in SPI mode.

LOCK_CS keeps CS asserted though the entire transfer.  This should
always be set.  The DMA code will always set it, explicitly on the
first segment of the first transfer, and then implicitly on all the
rest by never clearing the bit from the value read from the ctrl0
register.

The PIO code will explicitly set it for the first transfer, leave it
set for intermediate transfers, and then clear it for the final
transfer.  It should not clear it.

The only reason to not set LOCK_CS would be to attempt an altered
protocol where CS pulses between each word.  Though don't get your
hopes up if you want to do this, as the hardware doesn't appear to do
this in any sane manner.  It appears to be related to the hardware
FIFO fill level.

The code can be simplified by just setting LOCK_CS once and then not
needing to deal with it at all in the PIO and DMA transfer functions.

Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi/s3c64xx: Add missing pm_runtime_put on setup fail
Krzysztof Kozlowski [Thu, 17 Oct 2013 12:45:41 +0000 (14:45 +0200)]
spi/s3c64xx: Add missing pm_runtime_put on setup fail

pm_runtime_put() wasn't called if clock rate could not be set up in
s3c64xx_spi_setup() leading to invalid count of device pm_runtime usage.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agospi/s3c64xx: Add missing pm_runtime_set_active() call in probe()
Krzysztof Kozlowski [Thu, 17 Oct 2013 16:06:46 +0000 (18:06 +0200)]
spi/s3c64xx: Add missing pm_runtime_set_active() call in probe()

Mark device as PM runtime active during initialization to reflect
actual device power/clocks state. This reduces the enable count for SPI
bus controller gate clock so it can be disabled when the bus controller
is not used.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
11 years agoMerge tag 'driver-core-3.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Thu, 17 Oct 2013 17:39:01 +0000 (10:39 -0700)]
Merge tag 'driver-core-3.12-rc6' of git://git./linux/kernel/git/gregkh/driver-core

Pull driver core fix from Greg KH:
 "Here is one fix for the hotplug memory path that resolves a regression
  when removing memory that showed up in 3.12-rc1"

* tag 'driver-core-3.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  driver core: Release device_hotplug_lock when store_mem_state returns EINVAL

11 years agoMerge tag 'usb-3.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Thu, 17 Oct 2013 17:38:18 +0000 (10:38 -0700)]
Merge tag 'usb-3.12-rc6' of git://git./linux/kernel/git/gregkh/usb

Pull USB fixes from Greg KH:
 "Here are some USB fixes and new device ids for 3.12-rc6

  The largest change here is a bunch of new device ids for the option
  USB serial driver for new Huawei devices.  Other than that, just some
  small bug fixes for issues that people have reported (run-time and
  build-time), nothing major"

* tag 'usb-3.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  usb: usb_phy_gen: refine conditional declaration of usb_nop_xceiv_register
  usb: misc: usb3503: Fix compile error due to incorrect regmap depedency
  usb/chipidea: fix oops on memory allocation failure
  usb-storage: add quirk for mandatory READ_CAPACITY_16
  usb: serial: option: blacklist Olivetti Olicard200
  USB: quirks: add touchscreen that is dazzeled by remote wakeup
  Revert "usb: musb: gadget: fix otg active status flag"
  USB: quirks.c: add one device that cannot deal with suspension
  USB: serial: option: add support for Inovia SEW858 device
  USB: serial: ti_usb_3410_5052: add Abbott strip port ID to combined table as well.
  USB: support new huawei devices in option.c
  usb: musb: start musb on the udc side, too
  xhci: Fix spurious wakeups after S5 on Haswell
  xhci: fix write to USB3_PSSEN and XUSB2PRM pci config registers
  xhci: quirk for extra long delay for S4
  xhci: Don't enable/disable RWE on bus suspend/resume.

11 years agoMerge tag 'tty-3.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Linus Torvalds [Thu, 17 Oct 2013 17:37:42 +0000 (10:37 -0700)]
Merge tag 'tty-3.12-rc6' of git://git./linux/kernel/git/gregkh/tty

Pull serial driver fixes from Greg KH:
 "Here are two serial driver fixes for your tree.  One is a revert of a
  patch that causes a build error, the other is a fix to provide the
  correct brace placement which resolves a bug where the driver was not
  working properly"

* tag 'tty-3.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  serial: vt8500: add missing braces
  Revert "serial: i.MX: evaluate linux,stdout-path property"

11 years agoMerge tag 'char-misc-3.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregk...
Linus Torvalds [Thu, 17 Oct 2013 17:36:57 +0000 (10:36 -0700)]
Merge tag 'char-misc-3.12-rc6' of git://git./linux/kernel/git/gregkh/char-misc

Pull char/misc driver fixes from Greg KH:
 "Here are some small iio and w1 driver fixes for 3.12-rc6.

  There is also a hyper-v fix in here, which turned out to be incorrect,
  so it was reverted.  That will probably have to wait unto 3.13-rc1 to
  get accepted as it's still being discussed"

* tag 'char-misc-3.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  Revert "Drivers: hv: vmbus: Fix a bug in channel rescind code"
  Drivers: hv: vmbus: Fix a bug in channel rescind code
  iio:buffer: Free active scan mask in iio_disable_all_buffers()
  iio: frequency: adf4350: add missing clk_disable_unprepare() on error in adf4350_probe()
  w1 - call request_module with w1 master mutex unlocked
  w1 - fix fops in w1_bus_notify

11 years agoMerge tag 'sound-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Linus Torvalds [Thu, 17 Oct 2013 17:17:25 +0000 (10:17 -0700)]
Merge tag 'sound-3.12' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "All reasonably small fixes as rc6: a HD-audio mic fix, a us122l mmap
  regression fix, and kernel memory leak fix in hdsp driver.  Hopefully
  this will be the last pull request for 3.12..."

* tag 'sound-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hdsp - info leak in snd_hdsp_hwdep_ioctl()
  ALSA: us122l: Fix pcm_usb_stream mmapping regression
  ALSA: hda - Fix inverted internal mic not indicated on some machines

11 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
Linus Torvalds [Thu, 17 Oct 2013 17:16:45 +0000 (10:16 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/jmorris/linux-security

Pull apparmor fixes from James Morris:
 "A couple more regressions fixed"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  apparmor: fix bad lock balance when introspecting policy
  apparmor: fix memleak of the profile hash

11 years agoMerge tag 'iio-fixes-for-3.12c' of git://git.kernel.org/pub/scm/linux/kernel/git...
Greg Kroah-Hartman [Thu, 17 Oct 2013 16:40:52 +0000 (09:40 -0700)]
Merge tag 'iio-fixes-for-3.12c' of git://git./linux/kernel/git/jic23/iio into char-misc-linus

Jonathan writes:

Third set of IIO fixes for the 3.12 cycle.

Two little ones this time:

1) A missing clk_unprepare in adf4350.
2) A missing free of the active_scan_mask when iio_disable_all_buffers is
called during an unexpected device removal.  This leak was introduced by
the fix
a87c82e454f184a9473f8cdfd4d304205f585f65 iio: Stop sampling when the device is removed
and hence is a regression fix.

11 years agousb: usb_phy_gen: refine conditional declaration of usb_nop_xceiv_register
Guenter Roeck [Thu, 17 Oct 2013 02:18:41 +0000 (19:18 -0700)]
usb: usb_phy_gen: refine conditional declaration of usb_nop_xceiv_register

Commit 3fa4d734 (usb: phy: rename nop_usb_xceiv => usb_phy_gen_xceiv)
changed the conditional around the declaration of usb_nop_xceiv_register
from
#if defined(CONFIG_NOP_USB_XCEIV) ||
(defined(CONFIG_NOP_USB_XCEIV_MODULE) && defined(MODULE))
to
#if IS_ENABLED(CONFIG_NOP_USB_XCEIV)

While that looks the same, it is semantically different. The first expression
is true if CONFIG_NOP_USB_XCEIV is built as module and if the including
code is built as module. The second expression is true if code depending on
CONFIG_NOP_USB_XCEIV if built as module or into the kernel.

As a result, the arm:allmodconfig build fails with

arch/arm/mach-omap2/built-in.o: In function `omap3_evm_init':
arch/arm/mach-omap2/board-omap3evm.c:703: undefined reference to
`usb_nop_xceiv_register'

Fix the problem by reverting to the old conditional.

Cc: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
11 years agoRevert "Drivers: hv: vmbus: Fix a bug in channel rescind code"
Greg Kroah-Hartman [Thu, 17 Oct 2013 16:30:10 +0000 (09:30 -0700)]
Revert "Drivers: hv: vmbus: Fix a bug in channel rescind code"

This reverts commit 90d33f3ec519db19d785216299a4ee85ef58ec97 as it's not
the correct fix for this issue, and it causes a build warning to be
added to the kernel tree.

Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
11 years agoACPI / PM: Drop two functions that are not used any more
Rafael J. Wysocki [Thu, 17 Oct 2013 13:44:48 +0000 (15:44 +0200)]
ACPI / PM: Drop two functions that are not used any more

Two functions defined in device_pm.c, acpi_dev_pm_add_dependent()
and acpi_dev_pm_remove_dependent(), have no callers and may be
dropped, so drop them.

Moreover, they are the only functions adding entries to and removing
entries from the power_dependent list in struct acpi_device, so drop
that list too.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
11 years agoATA / ACPI: remove power dependent device handling
Aaron Lu [Thu, 17 Oct 2013 13:38:53 +0000 (15:38 +0200)]
ATA / ACPI: remove power dependent device handling

Previously, we wanted SCSI devices corrsponding to ATA devices to
be runtime resumed when the power resource for those ATA device was
turned on by some other device, so we added the SCSI device to the
dependent device list of the ATA device's ACPI node.  However, this
code has no effect after commit 41863fc (ACPI / power: Drop automaitc
resume of power resource dependent devices) and the mechanism it was
supposed to implement is regarded as a bad idea now, so drop it.

[rjw: Changelog]
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
11 years agospi/tegra20-slink: Move first transfer preparation to prepare_message
Mark Brown [Sat, 5 Oct 2013 11:30:42 +0000 (12:30 +0100)]
spi/tegra20-slink: Move first transfer preparation to prepare_message

This is more idiomatic for the factored out message processing and gives a
small simplification of the code since we always set the per-transfer
parameters in the same fashion.

Signed-off-by: Mark Brown <broonie@linaro.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
11 years agospi/tegra20-slink: Crude refactoring to use core message parsing
Mark Brown [Sat, 5 Oct 2013 11:23:38 +0000 (12:23 +0100)]
spi/tegra20-slink: Crude refactoring to use core message parsing

This is a half done conversion with minimal code reorganisation provided
for bisection purposes. A further patch will move the first transfer
preparation into tegra_slink_prepare_message().

The cs_change and udelay handling is removed, these should be
implemented by the framework and in any case are buggy - the two fields
should not be related and the cs_change handling appears to at best only
work the first time it's used in a message.

Signed-off-by: Mark Brown <broonie@linaro.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
11 years agoMerge branch 'akpm' (fixes from Andrew Morton)
Linus Torvalds [Thu, 17 Oct 2013 04:36:03 +0000 (21:36 -0700)]
Merge branch 'akpm' (fixes from Andrew Morton)

Merge misc fixes from Andrew Morton.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (21 commits)
  mm: revert mremap pud_free anti-fix
  mm: fix BUG in __split_huge_page_pmd
  swap: fix set_blocksize race during swapon/swapoff
  procfs: call default get_unmapped_area on MMU-present architectures
  procfs: fix unintended truncation of returned mapped address
  writeback: fix negative bdi max pause
  percpu_refcount: export symbols
  fs: buffer: move allocation failure loop into the allocator
  mm: memcg: handle non-error OOM situations more gracefully
  tools/testing/selftests: fix uninitialized variable
  block/partitions/efi.c: treat size mismatch as a warning, not an error
  mm: hugetlb: initialize PG_reserved for tail pages of gigantic compound pages
  mm/zswap: bugfix: memory leak when re-swapon
  mm: /proc/pid/pagemap: inspect _PAGE_SOFT_DIRTY only on present pages
  mm: migration: do not lose soft dirty bit if page is in migration state
  gcov: MAINTAINERS: Add an entry for gcov
  mm/hugetlb.c: correct missing private flag clearing
  mm/vmscan.c: don't forget to free shrinker->nr_deferred
  ipc/sem.c: synchronize semop and semctl with IPC_RMID
  ipc: update locking scheme comments
  ...

11 years agomm: revert mremap pud_free anti-fix
Hugh Dickins [Wed, 16 Oct 2013 20:47:09 +0000 (13:47 -0700)]
mm: revert mremap pud_free anti-fix

Revert commit 1ecfd533f4c5 ("mm/mremap.c: call pud_free() after fail
calling pmd_alloc()").

The original code was correct: pud_alloc(), pmd_alloc(), pte_alloc_map()
ensure that the pud, pmd, pt is already allocated, and seldom do they
need to allocate; on failure, upper levels are freed if appropriate by
the subsequent do_munmap().  Whereas commit 1ecfd533f4c5 did an
unconditional pud_free() of a most-likely still-in-use pud: saved only
by the near-impossiblity of pmd_alloc() failing.

Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agomm: fix BUG in __split_huge_page_pmd
Hugh Dickins [Wed, 16 Oct 2013 20:47:08 +0000 (13:47 -0700)]
mm: fix BUG in __split_huge_page_pmd

Occasionally we hit the BUG_ON(pmd_trans_huge(*pmd)) at the end of
__split_huge_page_pmd(): seen when doing madvise(,,MADV_DONTNEED).

It's invalid: we don't always have down_write of mmap_sem there: a racing
do_huge_pmd_wp_page() might have copied-on-write to another huge page
before our split_huge_page() got the anon_vma lock.

Forget the BUG_ON, just go back and try again if this happens.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: David Rientjes <rientjes@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agoswap: fix set_blocksize race during swapon/swapoff
Krzysztof Kozlowski [Wed, 16 Oct 2013 20:47:06 +0000 (13:47 -0700)]
swap: fix set_blocksize race during swapon/swapoff

Fix race between swapoff and swapon.  Swapoff used old_block_size from
swap_info outside of swapon_mutex so it could be overwritten by
concurrent swapon.

The race has visible effect only if more than one swap block device
exists with different block sizes (e.g.  /dev/sda1 with block size 4096
and /dev/sdb1 with 512).  In such case it leads to setting the blocksize
of swapped off device with wrong blocksize.

The bug can be triggered with multiple concurrent swapoff and swapon:
0. Swap for some device is on.
1. swapoff:
First the swapoff is called on this device and "struct swap_info_struct
*p" is assigned. This is done under swap_lock however this lock is
released for the call try_to_unuse().

2. swapon:
After the assignment above (and before acquiring swapon_mutex &
swap_lock by swapoff) the swapon is called on the same device.
The p->old_block_size is assigned to the value of block_size the device.
This block size should be the same as previous but sometimes it is not.
The swapon ends successfully.

3. swapoff:
Swapoff resumes, grabs the locks and mutex and continues to disable this
swap device. Now it sets the block size to value taken from swap_info
which was overwritten by swapon in 2.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reported-by: Weijie Yang <weijie.yang.kh@gmail.com>
Cc: Bob Liu <bob.liu@oracle.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Shaohua Li <shli@fusionio.com>
Cc: Minchan Kim <minchan@kernel.org>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agoprocfs: call default get_unmapped_area on MMU-present architectures
HATAYAMA Daisuke [Wed, 16 Oct 2013 20:47:05 +0000 (13:47 -0700)]
procfs: call default get_unmapped_area on MMU-present architectures

Commit c4fe24485729 ("sparc: fix PCI device proc file mmap(2)") added
proc_reg_get_unmapped_area in proc_reg_file_ops and
proc_reg_file_ops_no_compat, by which now mmap always returns EIO if
get_unmapped_area method is not defined for the target procfs file,
which causes regression of mmap on /proc/vmcore.

To address this issue, like get_unmapped_area(), call default
current->mm->get_unmapped_area on MMU-present architectures if
pde->proc_fops->get_unmapped_area, i.e.  the one in actual file
operation in the procfs file, is not defined.

Reported-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Tested-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agoprocfs: fix unintended truncation of returned mapped address
HATAYAMA Daisuke [Wed, 16 Oct 2013 20:47:04 +0000 (13:47 -0700)]
procfs: fix unintended truncation of returned mapped address

Currently, proc_reg_get_unmapped_area truncates upper 32-bit of the
mapped virtual address returned from get_unmapped_area method in
pde->proc_fops due to the variable rv of signed integer on x86_64.  This
is too small to have vitual address of unsigned long on x86_64 since on
x86_64, signed integer is of 4 bytes while unsigned long is of 8 bytes.
To fix this issue, use unsigned long instead.

Fixes a regression added in commit c4fe24485729 ("sparc: fix PCI device
proc file mmap(2)").

Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Tested-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agowriteback: fix negative bdi max pause
Fengguang Wu [Wed, 16 Oct 2013 20:47:03 +0000 (13:47 -0700)]
writeback: fix negative bdi max pause

Toralf runs trinity on UML/i386.  After some time it hangs and the last
message line is

BUG: soft lockup - CPU#0 stuck for 22s! [trinity-child0:1521]

It's found that pages_dirtied becomes very large.  More than 1000000000
pages in this case:

period = HZ * pages_dirtied / task_ratelimit;
BUG_ON(pages_dirtied > 2000000000);
BUG_ON(pages_dirtied > 1000000000);      <---------

UML debug printf shows that we got negative pause here:

ick: pause : -984
ick: pages_dirtied : 0
ick: task_ratelimit: 0

 pause:
+       if (pause < 0)  {
+               extern int printf(char *, ...);
+               printf("ick : pause : %li\n", pause);
+               printf("ick: pages_dirtied : %lu\n", pages_dirtied);
+               printf("ick: task_ratelimit: %lu\n", task_ratelimit);
+               BUG_ON(1);
+       }
        trace_balance_dirty_pages(bdi,

Since pause is bounded by [min_pause, max_pause] where min_pause is also
bounded by max_pause.  It's suspected and demonstrated that the
max_pause calculation goes wrong:

ick: pause : -717
ick: min_pause : -177
ick: max_pause : -717
ick: pages_dirtied : 14
ick: task_ratelimit: 0

The problem lies in the two "long = unsigned long" assignments in
bdi_max_pause() which might go negative if the highest bit is 1, and the
min_t(long, ...) check failed to protect it falling under 0.  Fix all of
them by using "unsigned long" throughout the function.

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Reported-by: Toralf Förster <toralf.foerster@gmx.de>
Tested-by: Toralf Förster <toralf.foerster@gmx.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Richard Weinberger <richard@nod.at>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agopercpu_refcount: export symbols
Matias Bjorling [Wed, 16 Oct 2013 20:47:01 +0000 (13:47 -0700)]
percpu_refcount: export symbols

Export the interface to be used within modules.

Signed-off-by: Matias Bjorling <m@bjorling.me>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agofs: buffer: move allocation failure loop into the allocator
Johannes Weiner [Wed, 16 Oct 2013 20:47:00 +0000 (13:47 -0700)]
fs: buffer: move allocation failure loop into the allocator

Buffer allocation has a very crude indefinite loop around waking the
flusher threads and performing global NOFS direct reclaim because it can
not handle allocation failures.

The most immediate problem with this is that the allocation may fail due
to a memory cgroup limit, where flushers + direct reclaim might not make
any progress towards resolving the situation at all.  Because unlike the
global case, a memory cgroup may not have any cache at all, only
anonymous pages but no swap.  This situation will lead to a reclaim
livelock with insane IO from waking the flushers and thrashing unrelated
filesystem cache in a tight loop.

Use __GFP_NOFAIL allocations for buffers for now.  This makes sure that
any looping happens in the page allocator, which knows how to
orchestrate kswapd, direct reclaim, and the flushers sensibly.  It also
allows memory cgroups to detect allocations that can't handle failure
and will allow them to ultimately bypass the limit if reclaim can not
make progress.

Reported-by: azurIt <azurit@pobox.sk>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agomm: memcg: handle non-error OOM situations more gracefully
Johannes Weiner [Wed, 16 Oct 2013 20:46:59 +0000 (13:46 -0700)]
mm: memcg: handle non-error OOM situations more gracefully

Commit 3812c8c8f395 ("mm: memcg: do not trap chargers with full
callstack on OOM") assumed that only a few places that can trigger a
memcg OOM situation do not return VM_FAULT_OOM, like optional page cache
readahead.  But there are many more and it's impractical to annotate
them all.

First of all, we don't want to invoke the OOM killer when the failed
allocation is gracefully handled, so defer the actual kill to the end of
the fault handling as well.  This simplifies the code quite a bit for
added bonus.

Second, since a failed allocation might not be the abrupt end of the
fault, the memcg OOM handler needs to be re-entrant until the fault
finishes for subsequent allocation attempts.  If an allocation is
attempted after the task already OOMed, allow it to bypass the limit so
that it can quickly finish the fault and invoke the OOM killer.

Reported-by: azurIt <azurit@pobox.sk>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agotools/testing/selftests: fix uninitialized variable
Felipe Pena [Wed, 16 Oct 2013 20:46:58 +0000 (13:46 -0700)]
tools/testing/selftests: fix uninitialized variable

The err variable is intended to receive the timer_create() return before
checking it

Signed-off-by: Felipe Pena <felipensp@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agoblock/partitions/efi.c: treat size mismatch as a warning, not an error
Doug Anderson [Wed, 16 Oct 2013 20:46:57 +0000 (13:46 -0700)]
block/partitions/efi.c: treat size mismatch as a warning, not an error

In commit 27a7c642174e ("partitions/efi: account for pmbr size in lba")
we started treating bad sizes in lba field of the partition that has the
0xEE (GPT protective) as errors.

However, we may run into these "bad sizes" in the real world if someone
uses dd to copy an image from a smaller disk to a bigger disk.  Since
this case used to work (even without using force_gpt), keep it working
and treat the size mismatch as a warning instead of an error.

Reported-by: Josh Triplett <josh@joshtriplett.org>
Reported-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Acked-by: Davidlohr Bueso <davidlohr@hp.com>
Tested-by: Artem Bityutskiy <dedekind1@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agomm: hugetlb: initialize PG_reserved for tail pages of gigantic compound pages
Andrea Arcangeli [Wed, 16 Oct 2013 20:46:56 +0000 (13:46 -0700)]
mm: hugetlb: initialize PG_reserved for tail pages of gigantic compound pages

Commit 11feeb498086 ("kvm: optimize away THP checks in
kvm_is_mmio_pfn()") introduced a memory leak when KVM is run on gigantic
compound pages.

That commit depends on the assumption that PG_reserved is identical for
all head and tail pages of a compound page.  So that if get_user_pages
returns a tail page, we don't need to check the head page in order to
know if we deal with a reserved page that requires different
refcounting.

The assumption that PG_reserved is the same for head and tail pages is
certainly correct for THP and regular hugepages, but gigantic hugepages
allocated through bootmem don't clear the PG_reserved on the tail pages
(the clearing of PG_reserved is done later only if the gigantic hugepage
is freed).

This patch corrects the gigantic compound page initialization so that we
can retain the optimization in 11feeb498086.  The cacheline was already
modified in order to set PG_tail so this won't affect the boot time of
large memory systems.

[akpm@linux-foundation.org: tweak comment layout and grammar]
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reported-by: andy123 <ajs124.ajs124@gmail.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Acked-by: Rafael Aquini <aquini@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agomm/zswap: bugfix: memory leak when re-swapon
Weijie Yang [Wed, 16 Oct 2013 20:46:54 +0000 (13:46 -0700)]
mm/zswap: bugfix: memory leak when re-swapon

zswap_tree is not freed when swapoff, and it got re-kmalloced in swapon,
so a memory leak occurs.

Free the memory of zswap_tree in zswap_frontswap_invalidate_area().

Signed-off-by: Weijie Yang <weijie.yang@samsung.com>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Cc: Minchan Kim <minchan@kernel.org>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Cc: <stable@vger.kernel.org>
From: Weijie Yang <weijie.yang@samsung.com>
Subject: mm/zswap: bugfix: memory leak when invalidate and reclaim occur concurrently

Consider the following scenario:
thread 0: reclaim entry x (get refcount, but not call zswap_get_swap_cache_page)
thread 1: call zswap_frontswap_invalidate_page to invalidate entry x.
finished, entry x and its zbud is not freed as its refcount != 0
now, the swap_map[x] = 0
thread 0: now call zswap_get_swap_cache_page
swapcache_prepare return -ENOENT because entry x is not used any more
zswap_get_swap_cache_page return ZSWAP_SWAPCACHE_NOMEM
zswap_writeback_entry do nothing except put refcount
Now, the memory of zswap_entry x and its zpage leak.

Modify:
 - check the refcount in fail path, free memory if it is not referenced.

 - use ZSWAP_SWAPCACHE_FAIL instead of ZSWAP_SWAPCACHE_NOMEM as the fail path
   can be not only caused by nomem but also by invalidate.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Weijie Yang <weijie.yang@samsung.com>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: <stable@vger.kernel.org>
Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agomm: /proc/pid/pagemap: inspect _PAGE_SOFT_DIRTY only on present pages
Cyrill Gorcunov [Wed, 16 Oct 2013 20:46:53 +0000 (13:46 -0700)]
mm: /proc/pid/pagemap: inspect _PAGE_SOFT_DIRTY only on present pages

If a page we are inspecting is in swap we may occasionally report it as
having soft dirty bit (even if it is clean).  The pte_soft_dirty helper
should be called on present pte only.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agomm: migration: do not lose soft dirty bit if page is in migration state
Cyrill Gorcunov [Wed, 16 Oct 2013 20:46:51 +0000 (13:46 -0700)]
mm: migration: do not lose soft dirty bit if page is in migration state

If page migration is turned on in config and the page is migrating, we
may lose the soft dirty bit.  If fork and mprotect are called on
migrating pages (once migration is complete) pages do not obtain the
soft dirty bit in the correspond pte entries.  Fix it adding an
appropriate test on swap entries.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agogcov: MAINTAINERS: Add an entry for gcov
Peter Oberparleiter [Wed, 16 Oct 2013 20:46:49 +0000 (13:46 -0700)]
gcov: MAINTAINERS: Add an entry for gcov

Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agomm/hugetlb.c: correct missing private flag clearing
Joonsoo Kim [Wed, 16 Oct 2013 20:46:48 +0000 (13:46 -0700)]
mm/hugetlb.c: correct missing private flag clearing

We should clear the page's private flag when returing the page to the
hugepage pool.  Otherwise, marked hugepage can be allocated to the user
who tries to allocate the non-reserved hugepage.  If this user fail to
map this hugepage, he would try to return the page to the hugepage pool.
Since this page has a private flag, resv_huge_pages would mistakenly
increase.  This patch fixes this situation.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agomm/vmscan.c: don't forget to free shrinker->nr_deferred
Andrew Vagin [Wed, 16 Oct 2013 20:46:46 +0000 (13:46 -0700)]
mm/vmscan.c: don't forget to free shrinker->nr_deferred

This leak was added by commit 1d3d4437eae1 ("vmscan: per-node deferred
work").

unreferenced object 0xffff88006ada3bd0 (size 8):
  comm "criu", pid 14781, jiffies 4295238251 (age 105.641s)
  hex dump (first 8 bytes):
    00 00 00 00 00 00 00 00                          ........
  backtrace:
    [<ffffffff8170caee>] kmemleak_alloc+0x5e/0xc0
    [<ffffffff811c0527>] __kmalloc+0x247/0x310
    [<ffffffff8117848c>] register_shrinker+0x3c/0xa0
    [<ffffffff811e115b>] sget+0x5ab/0x670
    [<ffffffff812532f4>] proc_mount+0x54/0x170
    [<ffffffff811e1893>] mount_fs+0x43/0x1b0
    [<ffffffff81202dd2>] vfs_kern_mount+0x72/0x110
    [<ffffffff81202e89>] kern_mount_data+0x19/0x30
    [<ffffffff812530a0>] pid_ns_prepare_proc+0x20/0x40
    [<ffffffff81083c56>] alloc_pid+0x466/0x4a0
    [<ffffffff8105aeda>] copy_process+0xc6a/0x1860
    [<ffffffff8105beab>] do_fork+0x8b/0x370
    [<ffffffff8105c1a6>] SyS_clone+0x16/0x20
    [<ffffffff8171f739>] stub_clone+0x69/0x90
    [<ffffffffffffffff>] 0xffffffffffffffff

Signed-off-by: Andrew Vagin <avagin@openvz.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Glauber Costa <glommer@openvz.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agoipc/sem.c: synchronize semop and semctl with IPC_RMID
Manfred Spraul [Wed, 16 Oct 2013 20:46:45 +0000 (13:46 -0700)]
ipc/sem.c: synchronize semop and semctl with IPC_RMID

After acquiring the semlock spinlock, operations must test that the
array is still valid.

 - semctl() and exit_sem() would walk stale linked lists (ugly, but
   should be ok: all lists are empty)

 - semtimedop() would sleep forever - and if woken up due to a signal -
   access memory after free.

The patch also:
 - standardizes the tests for .deleted, so that all tests in one
   function leave the function with the same approach.
 - unconditionally tests for .deleted immediately after every call to
   sem_lock - even it it means that for semctl(GETALL), .deleted will be
   tested twice.

Both changes make the review simpler: After every sem_lock, there must
be a test of .deleted, followed by a goto to the cleanup code (if the
function uses "goto cleanup").

The only exception is semctl_down(): If sem_ids().rwsem is locked, then
the presence in ids->ipcs_idr is equivalent to !.deleted, thus no
additional test is required.

Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Mike Galbraith <efault@gmx.de>
Acked-by: Davidlohr Bueso <davidlohr@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agoipc: update locking scheme comments
Davidlohr Bueso [Wed, 16 Oct 2013 20:46:45 +0000 (13:46 -0700)]
ipc: update locking scheme comments

The initial documentation was a bit incomplete, update accordingly.

[akpm@linux-foundation.org: make it more readable in 80 columns]
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Acked-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agomm, memcg: protect mem_cgroup_read_events for cpu hotplug
David Rientjes [Wed, 16 Oct 2013 20:46:43 +0000 (13:46 -0700)]
mm, memcg: protect mem_cgroup_read_events for cpu hotplug

for_each_online_cpu() needs the protection of {get,put}_online_cpus() so
cpu_online_mask doesn't change during the iteration.

cpu_hotplug.lock is held while a cpu is going down, it's a coarse lock
that is used kernel-wide to synchronize cpu hotplug activity.  Memcg has
a cpu hotplug notifier, called while there may not be any cpu hotplug
refcounts, which drains per-cpu event counts to memcg->nocpu_base.events
to maintain a cumulative event count as cpus disappear.  Without
get_online_cpus() in mem_cgroup_read_events(), it's possible to account
for the event count on a dying cpu twice, and this value may be
significantly large.

In fact, all memcg->pcp_counter_lock use should be nested by
{get,put}_online_cpus().

This fixes that issue and ensures the reported statistics are not vastly
over-reported during cpu hotplug.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
11 years agodriver core: Release device_hotplug_lock when store_mem_state returns EINVAL
Yasuaki Ishimatsu [Fri, 11 Oct 2013 06:36:25 +0000 (15:36 +0900)]
driver core: Release device_hotplug_lock when store_mem_state returns EINVAL

When inserting a wrong value to /sys/devices/system/memory/memoryX/state file,
following messages are shown. And device_hotplug_lock is never released.

================================================
[ BUG: lock held when returning to user space! ]
3.12.0-rc4-debug+ #3 Tainted: G        W
------------------------------------------------
bash/6442 is leaving the kernel with locks still held!
1 lock held by bash/6442:
 #0:  (device_hotplug_lock){+.+.+.}, at: [<ffffffff8146cbb5>] lock_device_hotplug_sysfs+0x15/0x50

This issue was introdued by commit fa2be40 (drivers: base: use standard
device online/offline for state change).

This patch releases device_hotplug_lcok when store_mem_state returns EINVAL.

Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Reviewed-by: Toshi Kani <toshi.kani@hp.com>
CC: Seth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
11 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Linus Torvalds [Thu, 17 Oct 2013 00:18:18 +0000 (17:18 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/viro/vfs

Pull tmpfile fix from Al Viro:
 "A fix for double iput() in ->tmpfile() on ext3 and ext4; I'd fucked it
  up, Miklos has caught it"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  ext[34]: fix double put in tmpfile