cpuidle: add cpuidle_unregister_driver() error check

Assure that cpuidle_unregister_driver() will not clobber the registered driver if unregistered by somebody else. Signed-off-by: Len Brown <len.brown@intel.com>
git-mirror · May 27, 2010 · c0d64cb · c0d64cb
1 parent 6b2c676
commit c0d64cb
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
@@ -45,8 +45,11 @@ EXPORT_SYMBOL_GPL(cpuidle_register_driver);
  */
 void cpuidle_unregister_driver(struct cpuidle_driver *drv)
 {
-	if (!drv)
+	if (drv != cpuidle_curr_driver) {
+		WARN(1, "invalid cpuidle_unregister_driver(%s)\n",
+			drv->name);
 		return;
+	}
 
 	spin_lock(&cpuidle_driver_lock);
 	cpuidle_curr_driver = NULL;