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cpuidle: Check the result of cpuidle_get_driver() against NULL

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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 <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Daniel Fu 2013-08-30 19:48:22 +08:00 • committed by Rafael J. Wysocki
commit 3b9c10e980
1 changed files with 2 additions and 1 deletions
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3
drivers/cpuidle/driver.c
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@ -331,7 +331,8 @@ struct cpuidle_driver *cpuidle_driver_ref(void)
spin_lock(&cpuidle_driver_lock);
drv = cpuidle_get_driver();
drv->refcnt++;
if (drv)
drv->refcnt++;
spin_unlock(&cpuidle_driver_lock);
return drv;