[PATCH 12/15] thermal: sysfs: lock cdev while accessing max_state

Eduardo Valentin
2016-05-31T06:34:10Z

Serialized calls to cdev->ops in user facing
sysfs handler thermal_cooling_device_max_state_show().

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
---
drivers/thermal/thermal_sysfs.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c
index 044090a..3eaa081 100644
--- a/drivers/thermal/thermal_sysfs.c
+++ b/drivers/thermal/thermal_sysfs.c
@@ -699,7 +699,9 @@ thermal_cooling_device_max_state_show(struct device *dev,
unsigned long state;
int ret;

+ mutex_lock(&cdev->lock);
ret = cdev->ops->get_max_state(cdev, &state);
+ mutex_unlock(&cdev->lock);
if (ret)
return ret;
return sprintf(buf, "%ld\n", state);
--
2.1.4