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Commit 700c6ea2 authored by Adam Nielsen's avatar Adam Nielsen Committed by Richard Purdie
Browse files

leds: Prevent multiple LED triggers with the same name 



Signed-off-by: default avatarAdam Nielsen <a.nielsen@shikadi.net>
Signed-off-by: default avatarRichard Purdie <rpurdie@linux.intel.com>
parent 17354bfe

drivers/leds/led-triggers.c

+9 −1
Original line number Original line Diff line number Diff line
@@ -156,12 +156,20 @@ EXPORT_SYMBOL_GPL(led_trigger_set_default); 
int led_trigger_register(struct led_trigger *trigger)

int led_trigger_register(struct led_trigger *trigger)

{

{

	struct led_classdev *led_cdev;

	struct led_classdev *led_cdev;

	struct led_trigger *trig;





	rwlock_init(&trigger->leddev_list_lock);

	rwlock_init(&trigger->leddev_list_lock);

	INIT_LIST_HEAD(&trigger->led_cdevs);

	INIT_LIST_HEAD(&trigger->led_cdevs);





	/* Add to the list of led triggers */

	down_write(&triggers_list_lock);

	down_write(&triggers_list_lock);

	/* Make sure the trigger's name isn't already in use */

	list_for_each_entry(trig, &trigger_list, next_trig) {

		if (!strcmp(trig->name, trigger->name)) {

			up_write(&triggers_list_lock);

			return -EEXIST;

		}

	}

	/* Add to the list of led triggers */

	list_add_tail(&trigger->next_trig, &trigger_list);

	list_add_tail(&trigger->next_trig, &trigger_list);

	up_write(&triggers_list_lock);

	up_write(&triggers_list_lock);