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| author | Daniel Fu <danifu@nvidia.com> | 2013-08-30 19:48:22 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-08-30 21:53:41 +0200 |
| commit | 3b9c10e98021e1f92e6f8c7ce1778b86ba68db10 (patch) | |
| tree | e8c2963b4d5a2c8d90836fc069256c733be54232 | |
| parent | 9e19b73c30a5fa42a53583a1f7817dd857126156 (diff) | |
| download | linux-3b9c10e98021e1f92e6f8c7ce1778b86ba68db10.tar.gz linux-3b9c10e98021e1f92e6f8c7ce1778b86ba68db10.tar.bz2 linux-3b9c10e98021e1f92e6f8c7ce1778b86ba68db10.zip | |
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>
| -rw-r--r-- | drivers/cpuidle/driver.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c index 3ac499d5a207..6e11701f0fca 100644 --- a/drivers/cpuidle/driver.c +++ b/drivers/cpuidle/driver.c @@ -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; |