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thermal: Fix locking in cooling device sysfs update cur_state

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[ Upstream commit 68000a0d98 ]

Sysfs interface to update cooling device cur_state does not
currently holding cooling device lock sometimes leading to
stale values in cur_state if getting updated simultanelously
from user space and thermal framework. Adding the proper locking
code fixes this issue.

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thara Gopinath
2018-11-27 17:43:11 -05:00
committed by Greg Kroah-Hartman
parent f8a33ec536
commit 9c74cd4afb
1 changed files with 7 additions and 4 deletions
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11
drivers/thermal/thermal_sysfs.c
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@ -712,11 +712,14 @@ cur_state_store(struct device *dev, struct device_attribute *attr,
if ((long)state < 0)
return -EINVAL;
mutex_lock(&cdev->lock);
result = cdev->ops->set_cur_state(cdev, state);
if (result)
return result;
thermal_cooling_device_stats_update(cdev, state);
return count;
if (!result)
thermal_cooling_device_stats_update(cdev, state);
mutex_unlock(&cdev->lock);
return result ? result : count;
}
static struct device_attribute