diff options
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/led-triggers.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c index f910eaffe3a6..d8ddd9ef8994 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); |