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>
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 5aa5773..7b723c7 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -757,6 +757,7 @@
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 @@
ret = count;
exit:
+ mutex_unlock(&tz->lock);
mutex_unlock(&thermal_governor_lock);
return ret;
}