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leds: Prevent multiple LED triggers with the same name

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Signed-off-by: Adam Nielsen <a.nielsen@shikadi.net>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
This commit is contained in:
Adam Nielsen
2009-02-18 08:18:04 +10:00
committed by Richard Purdie
parent 17354bfe85
commit 700c6ea224
1 changed files with 9 additions and 1 deletions
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10
drivers/leds/led-triggers.c
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@@ -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);