Serialized calls to tz.ops in user facing sysfs handler policy_show(). policy_store() is already locked by the thermal core.
Cc: Zhang Rui <[email protected]> Cc: [email protected] Cc: [email protected] Signed-off-by: Eduardo Valentin <[email protected]> --- drivers/thermal/thermal_sysfs.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c index dcaeb17..234eb18 100644 --- a/drivers/thermal/thermal_sysfs.c +++ b/drivers/thermal/thermal_sysfs.c @@ -311,8 +311,14 @@ static ssize_t policy_show(struct device *dev, struct device_attribute *devattr, char *buf) { struct thermal_zone_device *tz = to_thermal_zone(dev); + char *name; - return sprintf(buf, "%s\n", tz->governor->name); + /* locking the zone because governor->name does not change */ + mutex_lock(&tz->lock); + name = tz->governor->name; + mutex_unlock(&tz->lock); + + return sprintf(buf, "%s\n", name); } static ssize_t -- 2.1.4
