linux-stable.git/kernel/power, branch linux-3.15.y

PM / sleep: Fix request_firmware() error at resume

2014-07-28T15:08:28+00:00

commit 4320f6b1d9db4ca912c5eb6ecb328b2e090e1586 upstream.

The commit [247bc037: PM / Sleep: Mitigate race between the freezer
and request_firmware()] introduced the finer state control, but it
also leads to a new bug; for example, a bug report regarding the
firmware loading of intel BT device at suspend/resume:
  https://bugzilla.novell.com/show_bug.cgi?id=873790

The root cause seems to be a small window between the process resume
and the clear of usermodehelper lock.  The request_firmware() function
checks the UMH lock and gives up when it's in UMH_DISABLE state.  This
is for avoiding the invalid  f/w loading during suspend/resume phase.
The problem is, however, that usermodehelper_enable() is called at the
end of thaw_processes().  Thus, a thawed process in between can kick
off the f/w loader code path (in this case, via btusb_setup_intel())
even before the call of usermodehelper_enable().  Then
usermodehelper_read_trylock() returns an error and request_firmware()
spews WARN_ON() in the end.

This oneliner patch fixes the issue just by setting to UMH_FREEZING
state again before restarting tasks, so that the call of
request_firmware() will be blocked until the end of this function
instead of returning an error.

Fixes: 247bc0374254 (PM / Sleep: Mitigate race between the freezer and request_firmware())
Link: https://bugzilla.novell.com/show_bug.cgi?id=873790
Signed-off-by: Takashi Iwai 
Signed-off-by: Rafael J. Wysocki 
Signed-off-by: Greg Kroah-Hartman

asmlinkage: Add explicit __visible to drivers/, lib/, kernel/*

2014-05-05T23:07:46+00:00

As requested by Linus add explicit __visible to the asmlinkage users.
This marks functions visible to assembler.

Tree sweep for rest of tree.

Signed-off-by: Andi Kleen 
Link: http://lkml.kernel.org/r/1398984278-29319-4-git-send-email-andi@firstfloor.org
Signed-off-by: H. Peter Anvin

PM / suspend: Make cpuidle work in the "freeze" state

2014-04-21T21:39:59+00:00

The "freeze" system sleep state introduced by commit 7e73c5ae6e79
(PM: Introduce suspend state PM_SUSPEND_FREEZE) requires cpuidle
to be functional when freeze_enter() is executed to work correctly
(that is, to be able to save any more energy than runtime idle),
but that is impossible after commit 8651f97bd951d (PM / cpuidle:
System resume hang fix with cpuidle) which caused cpuidle to be
paused in dpm_suspend_noirq() and resumed in dpm_resume_noirq().

To avoid that problem, add cpuidle_resume() and cpuidle_pause()
to the beginning and the end of freeze_enter(), respectively.

Reported-by: Zhang Rui 
Signed-off-by: Rafael J. Wysocki 
Reviewed-by: Preeti U Murthy

kernel: use macros from compiler.h instead of attribute((...))

2014-04-07T23:36:11+00:00

To increase compiler portability there is  which
provides convenience macros for various gcc constructs.  Eg: __weak for
__attribute__((weak)).  I've replaced all instances of gcc attributes
with the right macro in the kernel subsystem.

Signed-off-by: Gideon Israel Dsouza 
Cc: "Rafael J. Wysocki" 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branches 'pm-runtime' and 'pm-sleep'

2014-03-20T12:25:54+00:00

* pm-runtime:
  PM / Runtime: Update runtime_idle() documentation for return value meaning

* pm-sleep:
  PM / sleep: Correct whitespace errors in 
  PM: Add missing "freeze" state
  PM / Hibernate: Spelling s/anonymouns/anonymous/
  PM / Runtime: Add missing "it" in comment
  PM / suspend: Remove unnecessary !!
  PCI / PM: Resume runtime-suspended devices later during system suspend
  ACPI / PM: Resume runtime-suspended devices later during system suspend
  PM / sleep: Set pm_generic functions to NULL for !CONFIG_PM_SLEEP
  PM: fix typo in comment
  PM / hibernate: use name_to_dev_t to parse resume
  PM / wakeup: Include appropriate header file in kernel/power/wakelock.c
  PM / sleep: Move prototype declaration to header file kernel/power/power.h
  PM / sleep: Asynchronous threads for suspend_late
  PM / sleep: Asynchronous threads for suspend_noirq
  PM / sleep: Asynchronous threads for resume_early
  PM / sleep: Asynchronous threads for resume_noirq
  PM / sleep: Two flags for async suspend_noirq and suspend_late

Merge branches 'pm-qos', 'pm-domains' and 'pm-drivers'

2014-03-20T12:25:36+00:00

* pm-qos:
  PM / QoS: Add type to dev_pm_qos_add_ancestor_request() arguments
  ACPI / LPSS: Support for device latency tolerance PM QoS
  ACPI / scan: Add bind/unbind callbacks to struct acpi_scan_handler
  PM / QoS: Introcuce latency tolerance device PM QoS type
  PM / QoS: Add no_constraints_value field to struct pm_qos_constraints
  PM / QoS: Rename device resume latency QoS items

* pm-domains:
  PM / domains: Turn latency warning into debug message

* pm-drivers:
  PM: Add pm_runtime_suspend|resume_force functions
  PM / runtime: Fetch runtime PM callbacks using a macro

PM: Add missing "freeze" state

2014-03-11T23:54:53+00:00

Fix descriptions of /sys/power/state in the documentation and in
a code comment.

Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Srivatsa S. Bhat 
Acked-by: Pavel Machek 
[rjw: Changelog]
Signed-off-by: Rafael J. Wysocki

PM / Hibernate: Spelling s/anonymouns/anonymous/

2014-03-11T23:54:53+00:00

Spelling fix.

Signed-off-by: Geert Uytterhoeven 
Acked-by: Pavel Machek 
Signed-off-by: Rafael J. Wysocki

PM / suspend: Remove unnecessary !!

2014-03-11T00:45:21+00:00

Double ! or !! are normally required to get 0 or 1 out of a expression. A
comparision always returns 0 or 1 and hence there is no need to apply double !
over it again.

Signed-off-by: Viresh Kumar 
Signed-off-by: Rafael J. Wysocki

PM / hibernate: use name_to_dev_t to parse resume

2014-03-01T00:02:52+00:00

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 
Acked-by: Pavel Machek 
Signed-off-by: Rafael J. Wysocki