Commit Graph

83 Commits

Author SHA1 Message Date
Rafael J. Wysocki 3513ac743d Merge branches 'pm-avs', 'pm-clk', 'pm-devfreq' and 'pm-sleep'
* pm-avs:
  PM / AVS: rockchip-io: add io selectors and supplies for rk3399

* pm-clk:
  PM / clk: Add support for obtaining clocks from device-tree

* pm-devfreq:
  PM / devfreq: Spelling s/frequnecy/frequency/

* pm-sleep:
  ACPI / PM: Runtime resume devices when waking from hibernate
  PM / sleep: Clear pm_suspend_global_flags upon hibernate
2016-03-25 00:58:18 +01:00
Lukas Wunner 276142730c PM / sleep: Clear pm_suspend_global_flags upon hibernate
When suspending to RAM, waking up and later suspending to disk,
we gratuitously runtime resume devices after the thaw phase.
This does not occur if we always suspend to RAM or always to disk.

pm_complete_with_resume_check(), which gets called from
pci_pm_complete() among others, schedules a runtime resume
if PM_SUSPEND_FLAG_FW_RESUME is set. The flag is set during
a suspend-to-RAM cycle. It is cleared at the beginning of
the suspend-to-RAM cycle but not afterwards and it is not
cleared during a suspend-to-disk cycle at all. Fix it.

Fixes: ef25ba0476 (PM / sleep: Add flags to indicate platform firmware involvement)
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: 4.4+ <stable@vger.kernel.org> # 4.4+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-03-23 02:43:11 +01:00
Laura Abbott 1414c7f4f7 mm/page_poisoning.c: allow for zero poisoning
By default, page poisoning uses a poison value (0xaa) on free.  If this
is changed to 0, the page is not only sanitized but zeroing on alloc
with __GFP_ZERO can be skipped as well.  The tradeoff is that detecting
corruption from the poisoning is harder to detect.  This feature also
cannot be used with hibernation since pages are not guaranteed to be
zeroed after hibernation.

Credit to Grsecurity/PaX team for inspiring this work

Signed-off-by: Laura Abbott <labbott@fedoraproject.org>
Acked-by: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mathias Krause <minipli@googlemail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Jianyu Zhan <nasa4836@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-03-15 16:55:16 -07:00
Geliang Tang d439e64f22 PM / hibernate: fix a comment typo
Just fix a typo in a function name in kerneldoc comments.

Signed-off-by: Geliang Tang <geliangtang@163.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-10-14 02:37:17 +02:00
Vitaly Kuznetsov 8c506608c3 PM / hibernate: re-enable nonboot cpus on disable_nonboot_cpus() failure
When disable_nonboot_cpus() fails on some cpu it doesn't bring back all
cpus it managed to offline, a consequent call to enable_nonboot_cpus() is
expected. In hibernation_platform_enter() we don't call
enable_nonboot_cpus() on error so cpus stay offlined.

create_image() and resume_target_kernel() functions handle
disable_nonboot_cpus() faults correctly, hibernation_platform_enter()
is the only one which is doing it wrong.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-06-24 23:48:44 +02:00
Tina Ruchandani db59760582 PM / Hibernate: Migrate to ktime_t
This patch migrates swsusp_show_speed and its callers to using ktime_t instead
of 'struct timeval' which suffers from the y2038 problem.

Changes to swsusp_show_speed:
        - use ktime_t for start and stop times
        - pass start and stop times by value
Calling functions affected:
        - load_image
        - load_image_lzo
        - save_image
        - save_image_lzo
        - hibernate_preallocate_memory
Design decisions:
        - use ktime_t to preserve same granularity of reporting as before
        - use centisecs logic as before to avoid 'div by zero' issues caused by
          using seconds and nanoseconds directly
        - use monotonic time (ktime_get()) since we only care about elapsed time.

Signed-off-by: Tina Ruchandani <ruchandani.tina@gmail.com>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-11-03 01:02:55 +01:00
Imre Deak 94fb823fcb PM / Sleep: fix recovery during resuming from hibernation
If a device's dev_pm_ops::freeze callback fails during the QUIESCE
phase, we don't rollback things correctly calling the thaw and complete
callbacks. This could leave some devices in a suspended state in case of
an error during resuming from hibernation.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-10-27 18:42:26 +01:00
Steven Rostedt (Red Hat) 2b014666a1 PM / Sleep: Remove ftrace_stop/start() from suspend and hibernate
ftrace_stop() and ftrace_start() were added to the suspend and hibernate
process because there was some function within the work flow that caused
the system to reboot if it was traced. This function has recently been
found (restore_processor_state()). Now there's no reason to disable
function tracing while we are going into suspend or hibernate, which means
that being able to trace this will help tremendously in debugging any
issues with suspend or hibernate.

This also means that the ftrace_stop/start() functions can be removed
and simplify the function tracing code a bit.

Link: http://lkml.kernel.org/r/1518201.VD9cU33jRU@vostro.rjw.lan

Acked-by: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2014-07-17 09:45:06 -04:00
Kees Cook 24f2e0273f x86, kaslr: boot-time selectable with hibernation
Changes kASLR from being compile-time selectable (blocked by
CONFIG_HIBERNATION), to being boot-time selectable (with hibernation
available by default) via the "kaslr" kernel command line.

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-06-16 23:30:44 +02:00
Kees Cook a6e15a3904 PM / hibernate: introduce "nohibernate" boot parameter
To support using kernel features that are not compatible with hibernation,
this creates the "nohibernate" kernel boot parameter to disable both
hibernation and resume. This allows hibernation support to be a boot-time
choice instead of only a compile-time choice.

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-06-16 23:29:39 +02:00
Todd E Brandt bb3632c610 PM / sleep: trace events for suspend/resume
Adds trace events that give finer resolution into suspend/resume. These
events are graphed in the timelines generated by the analyze_suspend.py
script. They represent large areas of time consumed that are typical to
suspend and resume.

The event is triggered by calling the function "trace_suspend_resume"
with three arguments: a string (the name of the event to be displayed
in the timeline), an integer (case specific number, such as the power
state or cpu number), and a boolean (where true is used to denote the start
of the timeline event, and false to denote the end).

The suspend_resume trace event reproduces the data that the machine_suspend
trace event did, so the latter has been removed.

Signed-off-by: Todd Brandt <todd.e.brandt@intel.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-06-07 00:18:07 +02:00
Dan Carpenter f6514be5fe PM / hibernate: Fix memory corruption in resumedelay_setup()
In the original code "resume_delay" is an int so on 64 bits, the call to
kstrtoul() will cause memory corruption.  We may as well fix a style
issue here as well and make "resume_delay" unsigned int, since that's
what we pass to ssleep().

Fixes: 317cf7e5e8 (PM / hibernate: convert simple_strtoul to kstrtoul)
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-05-16 23:15:05 +02:00
Fabian Frederick 317cf7e5e8 PM / hibernate: convert simple_strtoul to kstrtoul
Replace obsolete function.

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-05-09 23:32:08 +02:00
Sebastian Capella 2c730785d9 PM / hibernate: no kernel_power_off when pm_power_off NULL
Reboot logic in kernel/reboot will avoid calling kernel_power_off
when pm_power_off is null, and instead uses kernel_halt.  Change
hibernate's power_down to follow the behavior in the reboot call.

Calling the notifier twice (once for SYS_POWER_OFF and again for
SYS_HALT) causes a panic during hibernation on Kirkwood
Openblocks A6 board.

Signed-off-by: Sebastian Capella <sebastian.capella@linaro.org>
Reported-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-05-01 01:02:25 +02:00
Chen Gang 4881f603d7 PM / hibernate: use unsigned local variables in swsusp_show_speed()
do_div() needs 'u64' type, or it reports warning. And negative number
is meaningless for "speed", so change all signed to unsigned within
swsusp_show_speed().

The related warning (with allmodconfig for unicore32):

    CC      kernel/power/hibernate.o
  kernel/power/hibernate.c: In function ‘swsusp_show_speed’:
  kernel/power/hibernate.c:237: warning: comparison of distinct pointer types lacks a cast

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
[rjw: Subject]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-04-28 13:02:12 +02:00
Sebastian Capella 421a5fa1a6 PM / hibernate: use name_to_dev_t to parse resume
Use the name_to_dev_t call to parse the device name echo'd to
to /sys/power/resume.  This imitates the method used in hibernate.c
in software_resume, and allows the resume partition to be specified
using other equivalent device formats as well.  By allowing
/sys/debug/resume to accept the same syntax as the resume=device
parameter, we can parse the resume=device in the init script and
use the resume device directly from the kernel command line.

Signed-off-by: Sebastian Capella <sebastian.capella@linaro.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-03-01 01:02:52 +01:00
Bjørn Mork 362e77d1cb PM / hibernate: Call platform_leave() in suspend path too
Since create_image() only executes platform_leave() if in_suspend is
not set, enable_nonboot_cpus() is run by it with EC transactions
blocked (on ACPI systems) in the image creation code path (that is,
for in_suspend set), which may cause CPU online to fail for the CPUs
in question.  In particular, this causes the acpi_cpufreq driver's
initialization to fail for those CPUs on some systems with the
following dmesg:

 cpufreq: adding CPU 1
 acpi_cpufreq_cpu_init
 cpufreq: FREQ: 1401000 - CPU: 0
 ACPI Exception: AE_BAD_PARAMETER, Returned by Handler for [EmbeddedControl] (20130725/evregion-287)
 ACPI Error: Method parse/execution failed [\_SB_.PCI0.LPC_.EC__.LPMD] (Node ffff88023249ab28), AE_BAD_PARAMETER (20130725/psparse-536)
 ACPI Error: Method parse/execution failed [\_PR_.CPU0._PPC] (Node ffff88023270e3f8), AE_BAD_PARAMETER (20130725/psparse-536)
 ACPI Error: Method parse/execution failed [\_PR_.CPU1._PPC] (Node ffff88023270e290), AE_BAD_PARAMETER (20130725/psparse-536)
 ACPI Exception: AE_BAD_PARAMETER, Evaluating _PPC (20130725/processor_perflib-140)
 cpufreq: initialization failed
 CPU1 is up

To fix this problem, modify create_image() to execute platform_leave()
unconditionally.  [rjw: This shouldn't lead to any significant side
effects on ACPI systems.]

Signed-off-by: Bjørn Mork <bjorn@mork.no>
[rjw: Changelog]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-01-06 14:08:39 +01:00
Leonardo Potenza e0c7855e36 PM / hibernate: export hibernation_set_ops
To support the ability to implement PM hibernation code as modules
the hibernation_set_ops function requires to be exported.

Similar solution already available for suspend_set_ops
(please refer to commit a5e4fd8783).

Signed-off-by: Leonardo Potenza <leonardo.potenza@intel.com>
Signed-off-by: Edwin Verplanke <edwin.verplanke@intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-11-30 15:12:16 +01:00
Russ Dill d3c345dbc7 PM / hibernate: Move software_resume to late_initcall_sync
software_resume is being called after deferred_probe_initcall in
drivers base. If the probing of the device that contains the resume
image is deferred, and the system has been instructed to wait for
it to show up, this wait will occur in software_resume. This causes
a deadlock.

Move software_resume into late_initcall_sync so that it happens
after all the other late_initcalls.

Signed-off-by: Russ Dill <Russ.Dill@ti.com>
Acked-by: Pavel Machek <Pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-10-25 01:58:49 +02:00
Linus Torvalds 02b9735c12 ACPI and power management fixes for 3.12-rc1
1) ACPI-based PCI hotplug (ACPIPHP) fixes related to spurious events
 
   After the recent ACPIPHP changes we've seen some interesting breakage
   on a system that triggers device check notifications during boot for
   non-existing devices.  Although those notifications are really
   spurious, we should be able to deal with them nevertheless and that
   shouldn't introduce too much overhead.  Four commits to make that
   work properly.
 
  2) Memory hotplug and hibernation mutual exclusion rework
 
   This was maent to be a cleanup, but it happens to fix a classical
   ABBA deadlock between system suspend/hibernation and ACPI memory
   hotplug which is possible if they are started roughly at the same
   time.  Three commits rework memory hotplug so that it doesn't
   acquire pm_mutex and make hibernation use device_hotplug_lock
   which prevents it from racing with memory hotplug.
 
  3) ACPI Intel LPSS (Low-Power Subsystem) driver crash fix
 
   The ACPI LPSS driver crashes during boot on Apple Macbook Air with
   Haswell that has slightly unusual BIOS configuration in which one
   of the LPSS device's _CRS method doesn't return all of the information
   expected by the driver.  Fix from Mika Westerberg, for stable.
 
  4) ACPICA fix related to Store->ArgX operation
 
   AML interpreter fix for obscure breakage that causes AML to be
   executed incorrectly on some machines (observed in practice).  From
   Bob Moore.
 
  5) ACPI core fix for PCI ACPI device objects lookup
 
   There still are cases in which there is more than one ACPI device
   object matching a given PCI device and we don't choose the one that
   the BIOS expects us to choose, so this makes the lookup take more
   criteria into account in those cases.
 
  6) Fix to prevent cpuidle from crashing in some rare cases
 
   If the result of cpuidle_get_driver() is NULL, which can happen on
   some systems, cpuidle_driver_ref() will crash trying to use that
   pointer and the Daniel Fu's fix prevents that from happening.
 
  7) cpufreq fixes related to CPU hotplug
 
   Stephen Boyd reported a number of concurrency problems with cpufreq
   related to CPU hotplug which are addressed by a series of fixes
   from Srivatsa S Bhat and Viresh Kumar.
 
  8) cpufreq fix for time conversion in time_in_state attribute
 
   Time conversion carried out by cpufreq when user space attempts to
   read /sys/devices/system/cpu/cpu*/cpufreq/stats/time_in_state won't
   work correcty if cputime_t doesn't map directly to jiffies.  Fix
   from Andreas Schwab.
 
  9) Revert of a troublesome cpufreq commit
 
   Commit 7c30ed5 (cpufreq: make sure frequency transitions are
   serialized) was intended to address some known concurrency problems
   in cpufreq related to the ordering of transitions, but unfortunately
   it introduced several problems of its own, so I decided to revert it
   now and address the original problems later in a more robust way.
 
 10) Intel Haswell CPU models for intel_pstate from Nell Hardcastle.
 
 11) cpufreq fixes related to system suspend/resume
 
   The recent cpufreq changes that made it preserve CPU sysfs attributes
   over suspend/resume cycles introduced a possible NULL pointer
   dereference that caused it to crash during the second attempt to
   suspend.  Three commits from Srivatsa S Bhat fix that problem and a
   couple of related issues.
 
 12) cpufreq locking fix
 
   cpufreq_policy_restore() should acquire the lock for reading, but
   it acquires it for writing.  Fix from Lan Tianyu.
 
 /
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Merge tag 'pm+acpi-fixes-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI and power management fixes from Rafael Wysocki:
 "All of these commits are fixes that have emerged recently and some of
  them fix bugs introduced during this merge window.

  Specifics:

   1) ACPI-based PCI hotplug (ACPIPHP) fixes related to spurious events

      After the recent ACPIPHP changes we've seen some interesting
      breakage on a system that triggers device check notifications
      during boot for non-existing devices.  Although those
      notifications are really spurious, we should be able to deal with
      them nevertheless and that shouldn't introduce too much overhead.
      Four commits to make that work properly.

   2) Memory hotplug and hibernation mutual exclusion rework

      This was maent to be a cleanup, but it happens to fix a classical
      ABBA deadlock between system suspend/hibernation and ACPI memory
      hotplug which is possible if they are started roughly at the same
      time.  Three commits rework memory hotplug so that it doesn't
      acquire pm_mutex and make hibernation use device_hotplug_lock
      which prevents it from racing with memory hotplug.

   3) ACPI Intel LPSS (Low-Power Subsystem) driver crash fix

      The ACPI LPSS driver crashes during boot on Apple Macbook Air with
      Haswell that has slightly unusual BIOS configuration in which one
      of the LPSS device's _CRS method doesn't return all of the
      information expected by the driver.  Fix from Mika Westerberg, for
      stable.

   4) ACPICA fix related to Store->ArgX operation

      AML interpreter fix for obscure breakage that causes AML to be
      executed incorrectly on some machines (observed in practice).
      From Bob Moore.

   5) ACPI core fix for PCI ACPI device objects lookup

      There still are cases in which there is more than one ACPI device
      object matching a given PCI device and we don't choose the one
      that the BIOS expects us to choose, so this makes the lookup take
      more criteria into account in those cases.

   6) Fix to prevent cpuidle from crashing in some rare cases

      If the result of cpuidle_get_driver() is NULL, which can happen on
      some systems, cpuidle_driver_ref() will crash trying to use that
      pointer and the Daniel Fu's fix prevents that from happening.

   7) cpufreq fixes related to CPU hotplug

      Stephen Boyd reported a number of concurrency problems with
      cpufreq related to CPU hotplug which are addressed by a series of
      fixes from Srivatsa S Bhat and Viresh Kumar.

   8) cpufreq fix for time conversion in time_in_state attribute

      Time conversion carried out by cpufreq when user space attempts to
      read /sys/devices/system/cpu/cpu*/cpufreq/stats/time_in_state
      won't work correcty if cputime_t doesn't map directly to jiffies.
      Fix from Andreas Schwab.

   9) Revert of a troublesome cpufreq commit

      Commit 7c30ed5 (cpufreq: make sure frequency transitions are
      serialized) was intended to address some known concurrency
      problems in cpufreq related to the ordering of transitions, but
      unfortunately it introduced several problems of its own, so I
      decided to revert it now and address the original problems later
      in a more robust way.

  10) Intel Haswell CPU models for intel_pstate from Nell Hardcastle.

  11) cpufreq fixes related to system suspend/resume

      The recent cpufreq changes that made it preserve CPU sysfs
      attributes over suspend/resume cycles introduced a possible NULL
      pointer dereference that caused it to crash during the second
      attempt to suspend.  Three commits from Srivatsa S Bhat fix that
      problem and a couple of related issues.

  12) cpufreq locking fix

      cpufreq_policy_restore() should acquire the lock for reading, but
      it acquires it for writing.  Fix from Lan Tianyu"

* tag 'pm+acpi-fixes-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (25 commits)
  cpufreq: Acquire the lock in cpufreq_policy_restore() for reading
  cpufreq: Prevent problems in update_policy_cpu() if last_cpu == new_cpu
  cpufreq: Restructure if/else block to avoid unintended behavior
  cpufreq: Fix crash in cpufreq-stats during suspend/resume
  intel_pstate: Add Haswell CPU models
  Revert "cpufreq: make sure frequency transitions are serialized"
  cpufreq: Use signed type for 'ret' variable, to store negative error values
  cpufreq: Remove temporary fix for race between CPU hotplug and sysfs-writes
  cpufreq: Synchronize the cpufreq store_*() routines with CPU hotplug
  cpufreq: Invoke __cpufreq_remove_dev_finish() after releasing cpu_hotplug.lock
  cpufreq: Split __cpufreq_remove_dev() into two parts
  cpufreq: Fix wrong time unit conversion
  cpufreq: serialize calls to __cpufreq_governor()
  cpufreq: don't allow governor limits to be changed when it is disabled
  ACPI / bind: Prefer device objects with _STA to those without it
  ACPI / hotplug / PCI: Avoid parent bus rescans on spurious device checks
  ACPI / hotplug / PCI: Use _OST to notify firmware about notify status
  ACPI / hotplug / PCI: Avoid doing too much for spurious notifies
  ACPICA: Fix for a Store->ArgX when ArgX contains a reference to a field.
  ACPI / hotplug / PCI: Don't trim devices before scanning the namespace
  ...
2013-09-12 11:22:45 -07:00
Rafael J. Wysocki 942f40155a PM / hibernate / memory hotplug: Rework mutual exclusion
Since all of the memory hotplug operations have to be carried out
under device_hotplug_lock, they won't need to acquire pm_mutex if
device_hotplug_lock is held around hibernation.

For this reason, make the hibernation code acquire
device_hotplug_lock after freezing user space processes and
release it before thawing them.  At the same tim drop the
lock_system_sleep() and unlock_system_sleep() calls from
lock_memory_hotplug() and unlock_memory_hotplug(), respectively.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
2013-08-31 02:49:47 +02:00
Rafael J. Wysocki 8fd37a4c98 PM / hibernate: Create memory bitmaps after freezing user space
The hibernation core uses special memory bitmaps during image
creation and restoration and traditionally those bitmaps are
allocated before freezing tasks, because in the past GFP_KERNEL
allocations might not work after all tasks had been frozen.

However, this is an anachronism, because hibernation_snapshot()
now calls hibernate_preallocate_memory() which allocates memory
for the image upfront anyway, so the memory bitmaps may be
allocated after freezing user space safely.

For this reason, move all of the create_basic_memory_bitmaps()
calls after freeze_processes() and all of the corresponding
free_basic_memory_bitmaps() calls before thaw_processes().

This will allow us to hold device_hotplug_lock around hibernation
without the need to worry about freezing issues with user space
processes attempting to acquire it via sysfs attributes after the
creation of memory bitmaps and before the freezing of tasks.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
2013-08-31 02:49:33 +02:00
Andi Kleen d6efc2f724 x86, asmlinkage, power: Make various symbols used by the suspend asm code visible
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1375740170-7446-16-git-send-email-andi@firstfloor.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2013-08-06 14:21:03 -07:00
Linus Torvalds 7100e505b7 Power management updates for 3.6
* ACPI conversion to PM handling based on struct dev_pm_ops.
 * Conversion of a number of platform drivers to PM handling based on struct
   dev_pm_ops and removal of empty legacy PM callbacks from a couple of PCI
   drivers.
 * Suspend-to-both for in-kernel hibernation from Bojan Smojver.
 * cpuidle fixes and cleanups from ShuoX Liu, Daniel Lezcano and Preeti U Murthy.
 * cpufreq bug fixes from Jonghwa Lee and Stephen Boyd.
 * Suspend and hibernate fixes from Srivatsa S. Bhat and Colin Cross.
 * Generic PM domains framework updates.
 * RTC CMOS wakeup signaling update from Paul Fox.
 * sparse warnings fixes from Sachin Kamat.
 * Build warnings fixes for the generic PM domains framework and PM sysfs code.
 * sysfs switch for printing device suspend times from Sameer Nanda.
 * Documentation fix from Oskar Schirmer.
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Merge tag 'pm-for-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management updates from Rafael Wysocki:

 - ACPI conversion to PM handling based on struct dev_pm_ops.
 - Conversion of a number of platform drivers to PM handling based on
   struct dev_pm_ops and removal of empty legacy PM callbacks from a
   couple of PCI drivers.
 - Suspend-to-both for in-kernel hibernation from Bojan Smojver.
 - cpuidle fixes and cleanups from ShuoX Liu, Daniel Lezcano and Preeti
   Murthy.
 - cpufreq bug fixes from Jonghwa Lee and Stephen Boyd.
 - Suspend and hibernate fixes from Srivatsa Bhat and Colin Cross.
 - Generic PM domains framework updates.
 - RTC CMOS wakeup signaling update from Paul Fox.
 - sparse warnings fixes from Sachin Kamat.
 - Build warnings fixes for the generic PM domains framework and PM
   sysfs code.
 - sysfs switch for printing device suspend times from Sameer Nanda.
 - Documentation fix from Oskar Schirmer.

* tag 'pm-for-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (70 commits)
  cpufreq: Fix sysfs deadlock with concurrent hotplug/frequency switch
  EXYNOS: bugfix on retrieving old_index from freqs.old
  PM / Sleep: call early resume handlers when suspend_noirq fails
  PM / QoS: Use NULL pointer instead of plain integer in qos.c
  PM / QoS: Use NULL pointer instead of plain integer in pm_qos.h
  PM / Sleep: Require CAP_BLOCK_SUSPEND to use wake_lock/wake_unlock
  PM / Sleep: Add missing static storage class specifiers in main.c
  cpuilde / ACPI: remove time from acpi_processor_cx structure
  cpuidle / ACPI: remove usage from acpi_processor_cx structure
  cpuidle / ACPI : remove latency_ticks from acpi_processor_cx structure
  rtc-cmos: report wakeups from interrupt handler
  PM / Sleep: Fix build warning in sysfs.c for CONFIG_PM_SLEEP unset
  PM / Domains: Fix build warning for CONFIG_PM_RUNTIME unset
  olpc-xo15-sci: Use struct dev_pm_ops for power management
  PM / Domains: Replace plain integer with NULL pointer in domain.c file
  PM / Domains: Add missing static storage class specifier in domain.c file
  PM / crypto / ux500: Use struct dev_pm_ops for power management
  PM / IPMI: Remove empty legacy PCI PM callbacks
  tpm_nsc: Use struct dev_pm_ops for power management
  tpm_tis: Use struct dev_pm_ops for power management
  ...
2012-07-22 13:36:52 -07:00
Linus Torvalds eea03c20ae Make wait_for_device_probe() also do scsi_complete_async_scans()
Commit a7a20d1039 ("sd: limit the scope of the async probe domain")
make the SCSI device probing run device discovery in it's own async
domain.

However, as a result, the partition detection was no longer synchronized
by async_synchronize_full() (which, despite the name, only synchronizes
the global async space, not all of them).  Which in turn meant that
"wait_for_device_probe()" would not wait for the SCSI partitions to be
parsed.

And "wait_for_device_probe()" was what the boot time init code relied on
for mounting the root filesystem.

Now, most people never noticed this, because not only is it
timing-dependent, but modern distributions all use initrd.  So the root
filesystem isn't actually on a disk at all.  And then before they
actually mount the final disk filesystem, they will have loaded the
scsi-wait-scan module, which not only does the expected
wait_for_device_probe(), but also does scsi_complete_async_scans().

[ Side note: scsi_complete_async_scans() had also been partially broken,
  but that was fixed in commit 43a8d39d01 ("fix async probe
  regression"), so that same commit a7a20d1039 had actually broken
  setups even if you used scsi-wait-scan explicitly ]

Solve this problem by just moving the scsi_complete_async_scans() call
into wait_for_device_probe().  Everybody who wants to wait for device
probing to finish really wants the SCSI probing to complete, so there's
no reason not to do this.

So now "wait_for_device_probe()" really does what the name implies, and
properly waits for device probing to finish.  This also removes the now
unnecessary extra calls to scsi_complete_async_scans().

Reported-and-tested-by: Artem S. Tashkinov <t.artem@mailcity.com>
Cc: Dan Williams <dan.j.williams@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: James Bottomley <jbottomley@parallels.com>
Cc: Borislav Petkov <bp@amd64.org>
Cc: linux-scsi <linux-scsi@vger.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-07-18 18:15:46 -07:00
Srivatsa S. Bhat 443772d408 ftrace: Disable function tracing during suspend/resume and hibernation, again
If function tracing is enabled for some of the low-level suspend/resume
functions, it leads to triple fault during resume from suspend, ultimately
ending up in a reboot instead of a resume (or a total refusal to come out
of suspended state, on some machines).

This issue was explained in more detail in commit f42ac38c59 (ftrace:
disable tracing for suspend to ram). However, the changes made by that commit
got reverted by commit cbe2f5a6e8 (tracing: allow tracing of
suspend/resume & hibernation code again). So, unfortunately since things are
not yet robust enough to allow tracing of low-level suspend/resume functions,
suspend/resume is still broken when ftrace is enabled.

So fix this by disabling function tracing during suspend/resume & hibernation.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-01 13:31:22 +02:00
Bojan Smojver 62c552ccc3 PM / Hibernate: Enable suspend to both for in-kernel hibernation.
It is often useful to suspend to memory after hibernation image has been
written to disk. If the battery runs out or power is otherwise lost, the
computer will resume from the hibernated image. If not, it will resume
from memory and hibernation image will be discarded.

Signed-off-by: Bojan Smojver <bojan@rexursive.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-07-01 13:31:22 +02:00
Minho Ban 2df83fa4bc PM / Hibernate: Use get_gendisk to verify partition if resume_file is integer format
Sometimes resume= parameter comes in integer style (e.g. major:minor)
and then name_to_dev_t can not detect partition properly. (especially
async device like usb, mmc).

This patch calls get_gendisk() if resumewait is true and resume_file
is in integer format to work around this problem.

Signed-off-by: Minho Ban <mhban@samsung.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-05-18 20:44:59 +02:00
Rafael J. Wysocki 1e73203cd1 PM / Sleep: Move disabling of usermode helpers to the freezer
The core suspend/hibernation code calls usermodehelper_disable() to
avoid race conditions between the freezer and the starting of
usermode helpers and each code path has to do that on its own.
However, it is always called right before freeze_processes()
and usermodehelper_enable() is always called right after
thaw_processes().  For this reason, to avoid code duplication and
to make the connection between usermodehelper_disable() and the
freezer more visible, make freeze_processes() call it and remove the
direct usermodehelper_disable() and usermodehelper_enable() calls
from all suspend/hibernation code paths.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org
2012-03-28 23:30:21 +02:00
Rafael J. Wysocki 7b5179ac14 PM / Hibernate: Disable usermode helpers right before freezing tasks
There is no reason to call usermodehelper_disable() before creating
memory bitmaps in hibernate() and software_resume(), so call it right
before freeze_processes(), in accordance with the other suspend and
hibernation code.  Consequently, call usermodehelper_enable() right
after the thawing of tasks rather than after freeing the memory
bitmaps.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org
2012-03-28 23:30:14 +02:00
Srivatsa S. Bhat 05b4877f6a PM / Hibernate: Enable usermodehelpers in hibernate() error path
If create_basic_memory_bitmaps() fails, usermodehelpers are not re-enabled
before returning. Fix this. And while at it, reword the goto labels so that
they look more meaningful.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-03-04 23:08:37 +01:00
Srivatsa S. Bhat a556d5b583 PM / Hibernate: Refactor and simplify freezer_test_done
The code related to 'freezer_test_done' is needlessly convoluted.
Refactor the code and simplify the implementation.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-02-09 23:56:01 +01:00
Srivatsa S. Bhat 51d6ff7acd PM / Hibernate: Thaw kernel threads in hibernation_snapshot() in error/test path
In the hibernation call path, the kernel threads are frozen inside
hibernation_snapshot(). If we happen to encounter an error further down
the road or if we are exiting early due to a successful freezer test,
then thaw kernel threads before returning to the caller.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2012-02-09 23:55:54 +01:00
Rafael J. Wysocki cf579dfb82 PM / Sleep: Introduce "late suspend" and "early resume" of devices
The current device suspend/resume phases during system-wide power
transitions appear to be insufficient for some platforms that want
to use the same callback routines for saving device states and
related operations during runtime suspend/resume as well as during
system suspend/resume.  In principle, they could point their
.suspend_noirq() and .resume_noirq() to the same callback routines
as their .runtime_suspend() and .runtime_resume(), respectively,
but at least some of them require device interrupts to be enabled
while the code in those routines is running.

It also makes sense to have device suspend-resume callbacks that will
be executed with runtime PM disabled and with device interrupts
enabled in case someone needs to run some special code in that
context during system-wide power transitions.

Apart from this, .suspend_noirq() and .resume_noirq() were introduced
as a workaround for drivers using shared interrupts and failing to
prevent their interrupt handlers from accessing suspended hardware.
It appears to be better not to use them for other porposes, or we may
have to deal with some serious confusion (which seems to be happening
already).

For the above reasons, introduce new device suspend/resume phases,
"late suspend" and "early resume" (and analogously for hibernation)
whose callback will be executed with runtime PM disabled and with
device interrupts enabled and whose callback pointers generally may
point to runtime suspend/resume routines.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
2012-01-29 20:38:29 +01:00
Srivatsa S. Bhat bcda53faf5 PM / Sleep: Replace mutex_[un]lock(&pm_mutex) with [un]lock_system_sleep()
Using [un]lock_system_sleep() is safer than directly using mutex_[un]lock()
on 'pm_mutex', since the latter could lead to freezing failures. Hence convert
all the present users of mutex_[un]lock(&pm_mutex) to use these safe APIs
instead.

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-12-08 23:22:29 +01:00
Rafael J. Wysocki 2e8e89e392 Merge branch 'pm-freezer' into pm-sleep
* pm-freezer: (26 commits)
  Freezer / sunrpc / NFS: don't allow TASK_KILLABLE sleeps to block the freezer
  Freezer: fix more fallout from the thaw_process rename
  freezer: fix wait_event_freezable/__thaw_task races
  freezer: kill unused set_freezable_with_signal()
  dmatest: don't use set_freezable_with_signal()
  usb_storage: don't use set_freezable_with_signal()
  freezer: remove unused @sig_only from freeze_task()
  freezer: use lock_task_sighand() in fake_signal_wake_up()
  freezer: restructure __refrigerator()
  freezer: fix set_freezable[_with_signal]() race
  freezer: remove should_send_signal() and update frozen()
  freezer: remove now unused TIF_FREEZE
  freezer: make freezing() test freeze conditions in effect instead of TIF_FREEZE
  cgroup_freezer: prepare for removal of TIF_FREEZE
  freezer: clean up freeze_processes() failure path
  freezer: kill PF_FREEZING
  freezer: test freezable conditions while holding freezer_lock
  freezer: make freezing indicate freeze condition in effect
  freezer: use dedicated lock instead of task_lock() + memory barrier
  freezer: don't distinguish nosig tasks on thaw
  ...
2011-12-06 22:12:50 +01:00
Srivatsa S. Bhat 48580ab872 PM / Hibernate: Remove deprecated hibernation test modes
The hibernation test modes 'test' and 'testproc' are deprecated, because
the 'pm_test' framework offers much more fine-grained control for debugging
suspend and hibernation related problems.

So, remove the deprecated 'test' and 'testproc' hibernation test modes.

Suggested-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-12-06 22:08:14 +01:00
Srivatsa S. Bhat 97819a2622 PM / Hibernate: Thaw processes in SNAPSHOT_CREATE_IMAGE ioctl test path
Commit 2aede851dd (PM / Hibernate: Freeze
kernel threads after preallocating memory) moved the freezing of kernel
threads to hibernation_snapshot() function.

So now, if the call to hibernation_snapshot() returns early due to a
successful hibernation test, the caller has to thaw processes to ensure
that the system gets back to its original state.

But in SNAPSHOT_CREATE_IMAGE hibernation ioctl, the caller does not thaw
processes in case hibernation_snapshot() returned due to a successful
freezer test. Fix this issue. But note we still send the value of 'in_suspend'
(which is now 0) to userspace, because we are not in an error path per-se,
and moreover, the value of in_suspend correctly depicts the situation here.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-12-06 22:07:59 +01:00
Srivatsa S. Bhat 0118521cc7 PM / Hibernate: Enable usermodehelpers in software_resume() error path
In the software_resume() function defined in kernel/power/hibernate.c,
if the call to create_basic_memory_bitmaps() fails, the usermodehelpers
are not enabled (which had been disabled in the previous step). Fix it.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-12-06 22:07:51 +01:00
Srivatsa S. Bhat 953a206393 PM / Hibernate: Refactor and simplify hibernation_snapshot() code
The goto statements in hibernation_snapshot() are a bit complex.
Refactor the code to remove some of them, thereby simplifying the
implementation.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-11-23 21:13:41 +01:00
Rafael J. Wysocki 986b11c3ee Merge branch 'pm-freezer' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc into pm-freezer
* 'pm-freezer' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc: (24 commits)
  freezer: fix wait_event_freezable/__thaw_task races
  freezer: kill unused set_freezable_with_signal()
  dmatest: don't use set_freezable_with_signal()
  usb_storage: don't use set_freezable_with_signal()
  freezer: remove unused @sig_only from freeze_task()
  freezer: use lock_task_sighand() in fake_signal_wake_up()
  freezer: restructure __refrigerator()
  freezer: fix set_freezable[_with_signal]() race
  freezer: remove should_send_signal() and update frozen()
  freezer: remove now unused TIF_FREEZE
  freezer: make freezing() test freeze conditions in effect instead of TIF_FREEZE
  cgroup_freezer: prepare for removal of TIF_FREEZE
  freezer: clean up freeze_processes() failure path
  freezer: kill PF_FREEZING
  freezer: test freezable conditions while holding freezer_lock
  freezer: make freezing indicate freeze condition in effect
  freezer: use dedicated lock instead of task_lock() + memory barrier
  freezer: don't distinguish nosig tasks on thaw
  freezer: remove racy clear_freeze_flag() and set PF_NOFREEZE on dead tasks
  freezer: rename thaw_process() to __thaw_task() and simplify the implementation
  ...
2011-11-23 21:09:02 +01:00
Rafael J. Wysocki bb58dd5d1f PM / Hibernate: Do not leak memory in error/test code paths
The hibernation core code forgets to release memory preallocated
for hibernation if there's an error in its early stages or if test
modes causing hibernation_snapshot() to return early are used.  This
causes the system to be hardly usable, because the amount of
preallocated memory is usually huge.  Fix this problem.

Reported-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
2011-11-23 21:03:38 +01:00
Tejun Heo 03afed8bc2 freezer: clean up freeze_processes() failure path
freeze_processes() failure path is rather messy.  Freezing is canceled
for workqueues and tasks which aren't frozen yet but frozen tasks are
left alone and should be thawed by the caller and of course some
callers (xen and kexec) didn't do it.

This patch updates __thaw_task() to handle cancelation correctly and
makes freeze_processes() and freeze_kernel_threads() call
thaw_processes() on failure instead so that the system is fully thawed
on failure.  Unnecessary [suspend_]thaw_processes() calls are removed
from kernel/power/hibernate.c, suspend.c and user.c.

While at it, restructure error checking if clause in suspend_prepare()
to be less weird.

-v2: Srivatsa spotted missing removal of suspend_thaw_processes() in
     suspend_prepare() and error in commit message.  Updated.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
2011-11-21 12:32:24 -08:00
Srivatsa S. Bhat aa9a7b1182 PM / Hibernate: Fix the early termination of test modes
Commit 2aede851dd
(PM / Hibernate: Freeze kernel threads after preallocating memory)
postponed the freezing of kernel threads to after preallocating memory
for hibernation. But while doing that, the hibernation test TEST_FREEZER
and the test mode HIBERNATION_TESTPROC were not moved accordingly.

As a result, when using these test modes, it only goes upto the freezing of
userspace and exits, when in fact it should go till the complete end of task
freezing stage, namely the freezing of kernel threads as well.

So, move these points of exit to appropriate places so that freezing of
kernel threads is also tested while using these test harnesses.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-11-18 23:02:42 +01:00
Paul Gortmaker 6e5fdeedca kernel: Fix files explicitly needing EXPORT_SYMBOL infrastructure
These files were getting <linux/module.h> via an implicit non-obvious
path, but we want to crush those out of existence since they cost
time during compiles of processing thousands of lines of headers
for no reason.  Give them the lightweight header that just contains
the EXPORT_SYMBOL infrastructure.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:30:05 -04:00
Bojan Smojver 081a9d043c PM / Hibernate: Improve performance of LZO/plain hibernation, checksum image
Use threads for LZO compression/decompression on hibernate/thaw.
Improve buffering on hibernate/thaw.
Calculate/verify CRC32 of the image pages on hibernate/thaw.

In my testing, this improved write/read speed by a factor of about two.

Signed-off-by: Bojan Smojver <bojan@rexursive.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-10-16 23:30:38 +02:00
Barry Song d231ff1af7 PM / Hibernate: Do not initialize static and extern variables to 0
Static and extern variables in kernel/power/hibernate.c need not be
initialized to 0 explicitly, so remove those initializations.

[rjw: Modified subject, added changelog.]

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-10-16 23:30:38 +02:00
Barry Song f126f7334f PM / Hibernate: Add resumedelay kernel param in addition to resumewait
Patch "PM / Hibernate: Add resumewait param to support MMC-like
devices as resume file" added the resumewait kernel command line
option.  The present patch adds resumedelay so that
resumewait/delay were analogous to rootwait/delay.

[rjw: Modified the subject and changelog slightly.]

Signed-off-by: Barry Song <baohua.song@csr.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-10-16 23:30:37 +02:00
Barry Song 6f8d7022a8 PM / Hibernate: Add resumewait param to support MMC-like devices as resume file
Some devices like MMC are async detected very slow. For example,
drivers/mmc/host/sdhci.c launches a 200ms delayed work to detect
MMC partitions then add disk.

We have wait_for_device_probe() and scsi_complete_async_scans()
before calling swsusp_check(), but it is not enough to wait for MMC.

This patch adds resumewait kernel param just like rootwait so
that we have enough time to wait until MMC is ready. The difference is
that we wait for resume partition whereas rootwait waits for rootfs
partition (which may be on a different device).

This patch will make hibernation support many embedded products
without SCSI devices, but with devices like MMC.

[rjw: Modified the changelog slightly.]

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Reviewed-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-10-16 23:30:36 +02:00
Barry Song 21e82808fc PM / Hibernate: Fix typo in a kerneldoc comment
Fix a typo in a function name in the kerneldoc comment next to
resume_target_kernel().

[rjw: Changed the subject slightly, added the changelog.]

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-10-16 23:28:52 +02:00