linux-kernel - [PATCH 12/15] thermal: sysfs: lock cdev while accessing max

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Date:	Mon, 30 May 2016 23:31:33 -0700
From:	Eduardo Valentin <edubezval@...il.com>
To:	Rui Zhang <rui.zhang@...el.com>
Cc:	Linux PM <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Eduardo Valentin <edubezval@...il.com>
Subject: [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@...el.com>
Cc: linux-pm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Eduardo Valentin <edubezval@...il.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