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Yi Zeng d8ccbd1691 thermal: power_allocator: fix one race condition issue for thermal_instances list 
[ Upstream commit a5de11d67dcd268b8d0beb73dc374de5e97f0caf ]

When invoking allow_maximum_power and traverse tz->thermal_instances,
we should grab thermal_zone_device->lock to avoid race condition. For
example, during the system reboot, if the mali GPU device implements
device shutdown callback and unregister GPU devfreq cooling device,
the deleted list head may be accessed to cause panic, as the following
log shows:

[   33.551070] c3 25 (kworker/3:0) Unable to handle kernel paging request at virtual address dead000000000070
[   33.566708] c3 25 (kworker/3:0) pgd = ffffffc0ed290000
[   33.572071] c3 25 (kworker/3:0) [dead000000000070] *pgd=00000001ed292003, *pud=00000001ed292003, *pmd=0000000000000000
[   33.581515] c3 25 (kworker/3:0) Internal error: Oops: 96000004 [#1] PREEMPT SMP
[   33.599761] c3 25 (kworker/3:0) CPU: 3 PID: 25 Comm: kworker/3:0 Not tainted 4.4.35+ #912
[   33.614137] c3 25 (kworker/3:0) Workqueue: events_freezable thermal_zone_device_check
[   33.620245] c3 25 (kworker/3:0) task: ffffffc0f32e4200 ti: ffffffc0f32f0000 task.ti: ffffffc0f32f0000
[   33.629466] c3 25 (kworker/3:0) PC is at power_allocator_throttle+0x7c8/0x8a4
[   33.636609] c3 25 (kworker/3:0) LR is at power_allocator_throttle+0x808/0x8a4
[   33.643742] c3 25 (kworker/3:0) pc : [<ffffff8008683dd0>] lr : [<ffffff8008683e10>] pstate: 20000145
[   33.652874] c3 25 (kworker/3:0) sp : ffffffc0f32f3bb0
[   34.468519] c3 25 (kworker/3:0) Process kworker/3:0 (pid: 25, stack limit = 0xffffffc0f32f0020)
[   34.477220] c3 25 (kworker/3:0) Stack: (0xffffffc0f32f3bb0 to 0xffffffc0f32f4000)
[   34.819822] c3 25 (kworker/3:0) Call trace:
[   34.824021] c3 25 (kworker/3:0) Exception stack(0xffffffc0f32f39c0 to 0xffffffc0f32f3af0)
[   34.924993] c3 25 (kworker/3:0) [<ffffff8008683dd0>] power_allocator_throttle+0x7c8/0x8a4
[   34.933184] c3 25 (kworker/3:0) [<ffffff80086807f4>] handle_thermal_trip.part.25+0x70/0x224
[   34.941545] c3 25 (kworker/3:0) [<ffffff8008680a68>] thermal_zone_device_update+0xc0/0x20c
[   34.949818] c3 25 (kworker/3:0) [<ffffff8008680bd4>] thermal_zone_device_check+0x20/0x2c
[   34.957924] c3 25 (kworker/3:0) [<ffffff80080b93a4>] process_one_work+0x168/0x458
[   34.965414] c3 25 (kworker/3:0) [<ffffff80080ba068>] worker_thread+0x13c/0x4b4
[   34.972650] c3 25 (kworker/3:0) [<ffffff80080c0a4c>] kthread+0xe8/0xfc
[   34.979187] c3 25 (kworker/3:0) [<ffffff8008084e90>] ret_from_fork+0x10/0x40
[   34.986244] c3 25 (kworker/3:0) Code: f9405e73 eb1302bf d102e273 54ffc460 (b9402a61)
[   34.994339] c3 25 (kworker/3:0) ---[ end trace 32057901e3b7e1db ]---

Signed-off-by: Yi Zeng <yizeng@asrmicro.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-13 19:50:12 +02:00
..
int340x_thermal thermal: consistently use int for temperatures 2015-08-03 23:15:50 +08:00
samsung Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2015-11-11 09:03:01 -08:00
st Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2015-09-11 16:13:47 -07:00
ti-soc-thermal thermal: ti-soc-thermal: add OMAP36xx support 2015-09-29 14:13:19 -07:00
armada_thermal.c thermal: armada: Fix possible overflow in the Armada 380 thermal sensor formula 2015-10-30 11:33:23 -07:00
clock_cooling.c
cpu_cooling.c thermal: cpu_cooling: Avoid accessing potentially freed structures 2017-07-27 15:06:02 -07:00
db8500_cpufreq_cooling.c thermal: db8500_cpufreq_cooling: Fix module autoload for OF platform driver 2015-09-13 20:26:19 -07:00
db8500_thermal.c thermal: consistently use int for temperatures 2015-08-03 23:15:50 +08:00
devfreq_cooling.c devfreq_cooling: return on allocation failure 2015-11-04 11:06:29 -08:00
dove_thermal.c thermal: consistently use int for temperatures 2015-08-03 23:15:50 +08:00
fair_share.c thermal: consistently use int for temperatures 2015-08-03 23:15:50 +08:00
gov_bang_bang.c thermal: consistently use int for temperatures 2015-08-03 23:15:50 +08:00
hisi_thermal.c thermal: hisilicon: Handle return value of clk_prepare_enable 2017-12-25 14:22:15 +01:00
imx_thermal.c imx: thermal: use CPU temperature grade info for thresholds 2015-11-23 16:38:40 -08:00
intel_pch_thermal.c thermal: fix intel PCH thermal driver mismerge 2015-09-11 20:06:59 -07:00
intel_powerclamp.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2015-09-11 16:13:47 -07:00
intel_quark_dts_thermal.c thermal: consistently use int for temperatures 2015-08-03 23:15:50 +08:00
intel_soc_dts_iosf.c thermal: consistently use int for temperatures 2015-08-03 23:15:50 +08:00
intel_soc_dts_iosf.h Thermal: Intel SoC: DTS thermal IOSF core 2015-05-01 11:20:42 +08:00
intel_soc_dts_thermal.c Thermal: Intel SoC: DTS thermal use common APIs 2015-05-01 11:20:42 +08:00
Kconfig thermal: fix INTEL_SOC_DTS_IOSF_CORE dependencies 2018-02-25 11:03:43 +01:00
kirkwood_thermal.c thermal: consistently use int for temperatures 2015-08-03 23:15:50 +08:00
Makefile thermal: Add devfreq cooling 2015-10-30 10:21:01 -07:00
of-thermal.c thermal: of-thermal: Reduce log level for message when can't fine thermal zone 2015-11-16 10:49:17 -08:00
power_allocator.c thermal: power_allocator: fix one race condition issue for thermal_instances list 2018-04-13 19:50:12 +02:00
qcom-spmi-temp-alarm.c thermal: consistently use int for temperatures 2015-08-03 23:15:50 +08:00
rcar_thermal.c thermal: rcar_thermal: remove redundant operation 2015-11-16 10:53:08 -08:00
rockchip_thermal.c thermal: rockchip: fix a impossible condition caused by the warning 2016-05-04 14:48:54 -07:00
spear_thermal.c thermal: spear: use __maybe_unused for PM functions 2018-02-25 11:03:44 +01:00
step_wise.c thermal/drivers/step_wise: Fix temperature regulation misbehavior 2017-12-20 10:04:59 +01:00
tegra_soctherm.c thermal: consistently use int for temperatures 2015-08-03 23:15:50 +08:00
thermal_core.c Thermal: Ignore invalid trip points 2016-04-12 09:08:35 -07:00
thermal_core.h Thermal: initialize thermal zone device correctly 2016-03-03 15:07:25 -08:00
thermal_hwmon.c thermal: hwmon: Properly report critical temperature in sysfs 2017-01-09 08:07:44 +01:00
thermal_hwmon.h
user_space.c
x86_pkg_temp_thermal.c thermal: consistently use int for temperatures 2015-08-03 23:15:50 +08:00