From 700c6ea2242cf04ba3612fa7cf74763fffcc04fd Mon Sep 17 00:00:00 2001
From: Adam Nielsen <a.nielsen@shikadi.net>
Date: Wed, 18 Feb 2009 08:18:04 +1000
Subject: [PATCH] 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>
---
drivers/leds/led-triggers.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index f910eaffe3a6f..d8ddd9ef89949 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);
--
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