cpuidle: add cpuidle_unregister_driver() error check

Assure that cpuidle_unregister_driver() will not clobber the registered driver if unregistered by somebody else.

Len Brown committed 16 years ago

Commit c0d64cb1 parent 6b2c6761 file · +4 −1Browse files

Unified · Split

@@ -45,8 +45,11 @@ EXPORT_SYMBOL_GPL(cpuidle_register_driver); · 44 unmodified lines
45	45	*/
46	46	void cpuidle_unregister_driver(struct cpuidle_driver *drv)
47	47	{
48		− if (!drv)
	48	+ if (drv != cpuidle_curr_driver) {
	49	+ WARN(1, "invalid cpuidle_unregister_driver(%s)\n",
	50	+ drv->name);
49	51	return;
	52	+ }
50	53
51	54	spin_lock(&cpuidle_driver_lock);
52	55	cpuidle_curr_driver = NULL;