[PATCH 01/15] thermal: sysfs: lock tz in type_show

Eduardo Valentin
2016-05-31T06:32:02Z

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(-)

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
--
2.1.4