1 files changed, 37 insertions, 15 deletions

diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index bd59a14a4a..6345c52afb 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -23,7 +23,7 @@
  * Nests outside led_cdev->trigger_lock
  */
 static DECLARE_RWSEM(triggers_list_lock);
-LIST_HEAD(trigger_list);
+static LIST_HEAD(trigger_list);
 
  /* Used by LED Class */
 
@@ -179,9 +179,9 @@ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
 
 		cancel_work_sync(&led_cdev->set_brightness_work);
 		led_stop_software_blink(led_cdev);
+		device_remove_groups(led_cdev->dev, led_cdev->trigger->groups);
 		if (led_cdev->trigger->deactivate)
 			led_cdev->trigger->deactivate(led_cdev);
-		device_remove_groups(led_cdev->dev, led_cdev->trigger->groups);
 		led_cdev->trigger = NULL;
 		led_cdev->trigger_data = NULL;
 		led_cdev->activated = false;
@@ -194,11 +194,17 @@ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
 		spin_unlock(&trig->leddev_list_lock);
 		led_cdev->trigger = trig;
 
+		/*
+		 * If "set brightness to 0" is pending in workqueue,
+		 * we don't want that to be reordered after ->activate()
+		 */
+		flush_work(&led_cdev->set_brightness_work);
+
+		ret = 0;
 		if (trig->activate)
 			ret = trig->activate(led_cdev);
 		else
-			ret = 0;
-
+			led_set_brightness(led_cdev, trig->brightness);
 		if (ret)
 			goto err_activate;
 
@@ -247,9 +253,23 @@ void led_trigger_remove(struct led_classdev *led_cdev)
 }
 EXPORT_SYMBOL_GPL(led_trigger_remove);
 
+static bool led_match_default_trigger(struct led_classdev *led_cdev,
+				      struct led_trigger *trig)
+{
+	if (!strcmp(led_cdev->default_trigger, trig->name) &&
+	    trigger_relevant(led_cdev, trig)) {
+		led_cdev->flags |= LED_INIT_DEFAULT_TRIGGER;
+		led_trigger_set(led_cdev, trig);
+		return true;
+	}
+
+	return false;
+}
+
 void led_trigger_set_default(struct led_classdev *led_cdev)
 {
 	struct led_trigger *trig;
+	bool found = false;
 
 	if (!led_cdev->default_trigger)
 		return;
@@ -257,15 +277,19 @@ void led_trigger_set_default(struct led_classdev *led_cdev)
 	down_read(&triggers_list_lock);
 	down_write(&led_cdev->trigger_lock);
 	list_for_each_entry(trig, &trigger_list, next_trig) {
-		if (!strcmp(led_cdev->default_trigger, trig->name) &&
-		    trigger_relevant(led_cdev, trig)) {
-			led_cdev->flags |= LED_INIT_DEFAULT_TRIGGER;
-			led_trigger_set(led_cdev, trig);
+		found = led_match_default_trigger(led_cdev, trig);
+		if (found)
 			break;
-		}
 	}
 	up_write(&led_cdev->trigger_lock);
 	up_read(&triggers_list_lock);
+
+	/*
+	 * If default trigger wasn't found, maybe trigger module isn't loaded yet.
+	 * Once loaded it will re-probe with all led_cdev's.
+	 */
+	if (!found)
+		request_module_nowait("ledtrig:%s", led_cdev->default_trigger);
 }
 EXPORT_SYMBOL_GPL(led_trigger_set_default);
 
@@ -297,12 +321,8 @@ int led_trigger_register(struct led_trigger *trig)
 	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 &&
-		    !strcmp(led_cdev->default_trigger, trig->name) &&
-		    trigger_relevant(led_cdev, trig)) {
-			led_cdev->flags |= LED_INIT_DEFAULT_TRIGGER;
-			led_trigger_set(led_cdev, trig);
-		}
+		if (!led_cdev->trigger && led_cdev->default_trigger)
+			led_match_default_trigger(led_cdev, trig);
 		up_write(&led_cdev->trigger_lock);
 	}
 	up_read(&leds_list_lock);
@@ -373,6 +393,8 @@ void led_trigger_event(struct led_trigger *trig,
 	if (!trig)
 		return;
 
+	trig->brightness = brightness;
+
 	rcu_read_lock();
 	list_for_each_entry_rcu(led_cdev, &trig->led_cdevs, trig_list)
 		led_set_brightness(led_cdev, brightness);