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thermal: lock the thermal zone when switching governors 

Currently, userspace can request a governor change while the governor
itself is running.  Grab the thermal zone lock when changing the
governor to prevent this race.

Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Javi Merino 2014-11-25 16:00:33 +00:00 committed by Zhang Rui
parent 84ffe3ecc2
commit b6cc772f64
1 changed files with 2 additions and 0 deletions
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2
drivers/thermal/thermal_core.c
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@ -757,6 +757,7 @@ policy_store(struct device *dev, struct device_attribute *attr,
snprintf(name, sizeof(name), "%s", buf);
mutex_lock(&thermal_governor_lock);
mutex_lock(&tz->lock);
gov = __find_governor(strim(name));
if (!gov)
@ -766,6 +767,7 @@ policy_store(struct device *dev, struct device_attribute *attr,
ret = count;
exit:
mutex_unlock(&tz->lock);
mutex_unlock(&thermal_governor_lock);
return ret;
}