leds: Prevent multiple LED triggers with the same name

Signed-off-by: Adam Nielsen <a.nielsen@shikadi.net>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index f910eaffe3a..d8ddd9ef899 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -156,12 +156,20 @@ EXPORT_SYMBOL_GPL(led_trigger_set_default);
 int led_trigger_register(struct led_trigger *trigger)
 {
         struct led_classdev *led_cdev;
+        struct led_trigger *trig;
 
         rwlock_init(&trigger->leddev_list_lock);
         INIT_LIST_HEAD(&trigger->led_cdevs);
 
-        /* Add to the list of led triggers */
         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);
         up_write(&triggers_list_lock);