Li, Fei 4b70137931 cpuidle: check dev before usage in cpuidle_use_deepest_state() ...

commit 41dc750ea6 upstream.

In case of there is no cpuidle devices registered, dev will be null, and
panic will be triggered like below;
In this patch, add checking of dev before usage, like that done in
cpuidle_idle_call.

Panic without fix:
[  184.961328] BUG: unable to handle kernel NULL pointer dereference at
  (null)
[  184.961328] IP: cpuidle_use_deepest_state+0x30/0x60
...
[  184.961328]  play_idle+0x8d/0x210
[  184.961328]  ? __schedule+0x359/0x8e0
[  184.961328]  ? _raw_spin_unlock_irqrestore+0x28/0x50
[  184.961328]  ? kthread_queue_delayed_work+0x41/0x80
[  184.961328]  clamp_idle_injection_func+0x64/0x1e0

Fixes: bb8313b603 (cpuidle: Allow enforcing deepest idle state selection)
Signed-off-by: Li, Fei <fei.li@intel.com>
Tested-by: Shi, Feng <fengx.shi@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2017-05-25 15:46:26 +02:00

..

governors

Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2017-03-03 10:16:38 -08:00

coupled.c

cpuidle/coupled: Convert to hotplug state machine

2016-09-06 18:30:24 +02:00

cpuidle-arm.c

Merge branches 'pm-cpuidle', 'pm-opp' and 'pm-avs'

2016-10-02 01:43:16 +02:00

cpuidle-at91.c

drivers/cpuidle: Convert non-modular drivers to use builtin_platform_driver

2015-06-16 14:12:38 -04:00

cpuidle-big_little.c

ARM: MCPM: remove residency argument from mcpm_cpu_suspend()

2015-05-06 11:47:10 -04:00

cpuidle-calxeda.c

ARM: migrate to common PSCI client code

2015-08-03 15:38:39 +01:00

cpuidle-clps711x.c

drivers/cpuidle: make cpuidle-clps711x.c explicitly non-modular

2015-12-15 00:22:21 +01:00

cpuidle-cps.c

cpuidle: cpuidle-cps: Enable use with MIPSr6 CPUs.

2016-10-04 16:13:57 +02:00

cpuidle-exynos.c

drivers/cpuidle: make cpuidle-exynos.c explicitly non-modular

2015-12-15 00:22:22 +01:00

cpuidle-kirkwood.c

ARM: cpuidle: Remove duplicate header inclusion

2015-03-23 18:03:11 +01:00

cpuidle-mvebu-v7.c

cpuidle: mvebu: disable the bind/unbind attributes and use builtin_platform_driver

2015-10-23 12:40:48 +02:00

cpuidle-powernv.c

cpuidle: powernv: Pass correct drv->cpumask for registration

2017-03-29 22:55:36 +02:00

cpuidle-pseries.c

cpuidle/pseries: Convert to hotplug state machine

2016-09-06 18:30:24 +02:00

cpuidle-ux500.c

drivers/cpuidle: make cpuidle-ux500.c explicitly non-modular

2015-12-15 00:22:22 +01:00

cpuidle-zynq.c

drivers/cpuidle: Convert non-modular drivers to use builtin_platform_driver

2015-06-16 14:12:38 -04:00

cpuidle.c

cpuidle: check dev before usage in cpuidle_use_deepest_state()

2017-05-25 15:46:26 +02:00

cpuidle.h

cpuidle/coupled: Add sanity check for safe_state_index

2015-09-03 03:05:47 +02:00

driver.c

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/idle.h>

2017-03-02 08:42:26 +01:00

dt_idle_states.c

cpuidle: dt: assign ->enter_freeze to same as ->enter callback function

2016-11-23 02:03:11 +01:00

dt_idle_states.h

drivers: cpuidle: implement DT based idle states infrastructure

2014-09-25 10:52:20 +02:00

governor.c

cpuidle: governors: Remove remaining old module code

2016-10-21 14:49:51 +02:00

Kconfig

cpuidle: Don't enable all governors by default

2016-01-15 22:39:58 +01:00

Kconfig.arm

ARM: cpuidle: Enable the ARM64 driver for both ARM32/ARM64

2015-03-24 10:16:11 +01:00

Kconfig.mips

cpuidle: cpuidle-cps: Enable use with MIPSr6 CPUs.

2016-10-04 16:13:57 +02:00

Kconfig.powerpc

powerpc/powernv/cpuidle: Back-end cpuidle driver for powernv platform.

2014-01-29 17:02:24 +11:00

Makefile

ARM: cpuidle: Enable the ARM64 driver for both ARM32/ARM64

2015-03-24 10:16:11 +01:00

sysfs.c

cpuidle: Validate cpu_dev in cpuidle_add_sysfs()

2017-03-21 22:26:37 +01:00