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>

parent 6b2c676b

drivers/cpuidle/driver.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -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;