[01/15] thermal: sysfs: lock tz in type_show
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Message ID 1464676296-5610-2-git-send-email-edubezval@gmail.com
State Changes Requested
Delegated to: Zhang Rui
Headers show

Commit Message

Eduardo Valentin May 31, 2016, 6:31 a.m. UTC
Avoid race while accessing tz->type.

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 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Patch
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diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c
index 4136b71..ee983ca 100644
--- a/drivers/thermal/thermal_sysfs.c
+++ b/drivers/thermal/thermal_sysfs.c
@@ -29,8 +29,13 @@  static ssize_t
 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct thermal_zone_device *tz = to_thermal_zone(dev);
+	char *type;
 
-	return sprintf(buf, "%s\n", tz->type);
+	mutex_lock(&tz->lock);
+	type = tz->type;
+	mutex_unlock(&tz->lock);
+
+	return sprintf(buf, "%s\n", type);
 }
 
 static ssize_t