diff options
Diffstat (limited to 'drivers/leds/led-triggers.c')
| -rw-r--r-- | drivers/leds/led-triggers.c | 41 |
1 files changed, 21 insertions, 20 deletions
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c index 4e7b78a84149..072491d3e17b 100644 --- a/drivers/leds/led-triggers.c +++ b/drivers/leds/led-triggers.c @@ -157,7 +157,6 @@ EXPORT_SYMBOL_GPL(led_trigger_read); /* Caller must ensure led_cdev->trigger_lock held */ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig) { - unsigned long flags; char *event = NULL; char *envp[2]; const char *name; @@ -171,10 +170,13 @@ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig) /* Remove any existing trigger */ if (led_cdev->trigger) { - write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags); - list_del(&led_cdev->trig_list); - write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, - flags); + spin_lock(&led_cdev->trigger->leddev_list_lock); + list_del_rcu(&led_cdev->trig_list); + spin_unlock(&led_cdev->trigger->leddev_list_lock); + + /* ensure it's no longer visible on the led_cdevs list */ + synchronize_rcu(); + cancel_work_sync(&led_cdev->set_brightness_work); led_stop_software_blink(led_cdev); if (led_cdev->trigger->deactivate) @@ -186,9 +188,9 @@ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig) led_set_brightness(led_cdev, LED_OFF); } if (trig) { - write_lock_irqsave(&trig->leddev_list_lock, flags); - list_add_tail(&led_cdev->trig_list, &trig->led_cdevs); - write_unlock_irqrestore(&trig->leddev_list_lock, flags); + spin_lock(&trig->leddev_list_lock); + list_add_tail_rcu(&led_cdev->trig_list, &trig->led_cdevs); + spin_unlock(&trig->leddev_list_lock); led_cdev->trigger = trig; if (trig->activate) @@ -223,9 +225,10 @@ err_add_groups: trig->deactivate(led_cdev); err_activate: - write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags); - list_del(&led_cdev->trig_list); - write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, flags); + spin_lock(&led_cdev->trigger->leddev_list_lock); + list_del_rcu(&led_cdev->trig_list); + spin_unlock(&led_cdev->trigger->leddev_list_lock); + synchronize_rcu(); led_cdev->trigger = NULL; led_cdev->trigger_data = NULL; led_set_brightness(led_cdev, LED_OFF); @@ -285,7 +288,7 @@ int led_trigger_register(struct led_trigger *trig) struct led_classdev *led_cdev; struct led_trigger *_trig; - rwlock_init(&trig->leddev_list_lock); + spin_lock_init(&trig->leddev_list_lock); INIT_LIST_HEAD(&trig->led_cdevs); down_write(&triggers_list_lock); @@ -378,15 +381,14 @@ void led_trigger_event(struct led_trigger *trig, enum led_brightness brightness) { struct led_classdev *led_cdev; - unsigned long flags; if (!trig) return; - read_lock_irqsave(&trig->leddev_list_lock, flags); - list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) + rcu_read_lock(); + list_for_each_entry_rcu(led_cdev, &trig->led_cdevs, trig_list) led_set_brightness(led_cdev, brightness); - read_unlock_irqrestore(&trig->leddev_list_lock, flags); + rcu_read_unlock(); } EXPORT_SYMBOL_GPL(led_trigger_event); @@ -397,20 +399,19 @@ static void led_trigger_blink_setup(struct led_trigger *trig, int invert) { struct led_classdev *led_cdev; - unsigned long flags; if (!trig) return; - read_lock_irqsave(&trig->leddev_list_lock, flags); - list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) { + rcu_read_lock(); + list_for_each_entry_rcu(led_cdev, &trig->led_cdevs, trig_list) { if (oneshot) led_blink_set_oneshot(led_cdev, delay_on, delay_off, invert); else led_blink_set(led_cdev, delay_on, delay_off); } - read_unlock_irqrestore(&trig->leddev_list_lock, flags); + rcu_read_unlock(); } void led_trigger_blink(struct led_trigger *trig, |