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

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  [PATCH 12/15] thermal: sysfs: lock cdev while accessing max_state Eduardo Valentin <edubezval@gmail.com> - 2016-05-31 08:40 +0200

#1409880 — [PATCH 12/15] thermal: sysfs: lock cdev while accessing max_state

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

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