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thermal/core/fair share: Lock the thermal zone while looping over instances 

commit fef05776eb02238dcad8d5514e666a42572c3f32 upstream.

The tz->lock must be hold during the looping over the instances in that
thermal zone. This lock was missing in the governor code since the
beginning, so it's hard to point into a particular commit.

CC: stable@vger.kernel.org # 4.4+
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210422153624.6074-2-lukasz.luba@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lukasz Luba 2021-04-22 16:36:22 +01:00 committed by Greg Kroah-Hartman
parent 2c44110300
commit 7a474350d8
1 changed files with 4 additions and 0 deletions
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4
drivers/thermal/fair_share.c
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@ -82,6 +82,8 @@ static int fair_share_throttle(struct thermal_zone_device *tz, int trip)
int total_instance = 0;
int cur_trip_level = get_trip_level(tz);
mutex_lock(&tz->lock);
list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
if (instance->trip != trip)
continue;
@ -110,6 +112,8 @@ static int fair_share_throttle(struct thermal_zone_device *tz, int trip)
mutex_unlock(&instance->cdev->lock);
thermal_cdev_update(cdev);
}
mutex_unlock(&tz->lock);
return 0;
}