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drivers: thermal: add check when unregistering cpu cooling

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This patch avoids NULL pointer accesses while unregistering
cpu cooling devices, in case a NULL pointer is received.

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
This commit is contained in:
Eduardo Valentin 2013-08-15 10:54:46 -04:00
parent a8892d8389
commit 50e66c7ed8
1 changed files with 5 additions and 1 deletions
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6
drivers/thermal/cpu_cooling.c
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@ -498,8 +498,12 @@ EXPORT_SYMBOL_GPL(cpufreq_cooling_register);
*/ */
void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
{ {
struct cpufreq_cooling_device *cpufreq_dev = cdev->devdata; struct cpufreq_cooling_device *cpufreq_dev;
if (!cdev)
return;
cpufreq_dev = cdev->devdata;
mutex_lock(&cooling_cpufreq_lock); mutex_lock(&cooling_cpufreq_lock);
cpufreq_dev_count--; cpufreq_dev_count--;