Commit 3b9c10e9 authored Aug 30, 2013 by Daniel Fu Committed by Rafael J. Wysocki Aug 30, 2013

cpuidle: Check the result of cpuidle_get_driver() against NULL



If the current CPU has no cpuidle driver, drv will be NULL in
cpuidle_driver_ref().  Check if that is the case before trying
to bump up the driver's refcount to prevent the kernel from
crashing.

[rjw: Subject and changelog]
Signed-off-by: Daniel Fu <danifu@nvidia.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 9e19b73c

drivers/cpuidle/driver.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -331,6 +331,7 @@ struct cpuidle_driver *cpuidle_driver_ref(void)
		spin_lock(&cpuidle_driver_lock);

		drv = cpuidle_get_driver();
		if (drv)
		drv->refcnt++;

		spin_unlock(&cpuidle_driver_lock);