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authorDaniel Fu <danifu@nvidia.com>2013-08-30 19:48:22 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-08-30 21:53:41 +0200
commit3b9c10e98021e1f92e6f8c7ce1778b86ba68db10 (patch)
treee8c2963b4d5a2c8d90836fc069256c733be54232 /drivers/cpuidle
parent9e19b73c30a5fa42a53583a1f7817dd857126156 (diff)
downloadlinux-3b9c10e98021e1f92e6f8c7ce1778b86ba68db10.tar.bz2
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>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/driver.c3
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;