summaryrefslogtreecommitdiff
path: root/drivers/leds/led-triggers.c
diff options
context:
space:
mode:
authorRichard Purdie <rpurdie@rpsys.net>2007-12-31 23:09:44 +0000
committerRichard Purdie <rpurdie@rpsys.net>2007-12-31 23:09:44 +0000
commit72f8da329e07ad8a72c1f0e96b8955cfeb7c7329 (patch)
tree7440f70caf2fb70e987f814cebcdf233a17b425c /drivers/leds/led-triggers.c
parente697789d64f8748cb219d7f5c413c512953802cc (diff)
downloadlwn-72f8da329e07ad8a72c1f0e96b8955cfeb7c7329.tar.gz
lwn-72f8da329e07ad8a72c1f0e96b8955cfeb7c7329.zip
leds: Fix leds_list_lock locking issues
Covert leds_list_lock to a rw_sempahore to match previous LED trigger locking fixes, fixing lock ordering. Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Diffstat (limited to 'drivers/leds/led-triggers.c')
-rw-r--r--drivers/leds/led-triggers.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 0bdb786210b1..13c9026d68af 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -169,7 +169,7 @@ int led_trigger_register(struct led_trigger *trigger)
up_write(&triggers_list_lock);
/* Register with any LEDs that have this as a default trigger */
- read_lock(&leds_list_lock);
+ down_read(&leds_list_lock);
list_for_each_entry(led_cdev, &leds_list, node) {
down_write(&led_cdev->trigger_lock);
if (!led_cdev->trigger && led_cdev->default_trigger &&
@@ -177,7 +177,7 @@ int led_trigger_register(struct led_trigger *trigger)
led_trigger_set(led_cdev, trigger);
up_write(&led_cdev->trigger_lock);
}
- read_unlock(&leds_list_lock);
+ up_read(&leds_list_lock);
return 0;
}
@@ -212,14 +212,14 @@ void led_trigger_unregister(struct led_trigger *trigger)
up_write(&triggers_list_lock);
/* Remove anyone actively using this trigger */
- read_lock(&leds_list_lock);
+ down_read(&leds_list_lock);
list_for_each_entry(led_cdev, &leds_list, node) {
down_write(&led_cdev->trigger_lock);
if (led_cdev->trigger == trigger)
led_trigger_set(led_cdev, NULL);
up_write(&led_cdev->trigger_lock);
}
- read_unlock(&leds_list_lock);
+ up_read(&leds_list_lock);
}
void led_trigger_unregister_simple(struct led_trigger *trigger)