From 700c6ea2242cf04ba3612fa7cf74763fffcc04fd Mon Sep 17 00:00:00 2001 From: Adam Nielsen Date: Wed, 18 Feb 2009 08:18:04 +1000 Subject: leds: Prevent multiple LED triggers with the same name Signed-off-by: Adam Nielsen Signed-off-by: Richard Purdie --- drivers/leds/led-triggers.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'drivers/leds') diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c index f910eaf..d8ddd9e 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); -- cgit v1.1