1 files changed, 20 insertions, 6 deletions

diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index f6c46d2e5276..907fc703e0c5 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -159,8 +159,19 @@ static void set_brightness_delayed(struct work_struct *ws)
 	 * before this work item runs once. To make sure this works properly
 	 * handle LED_SET_BRIGHTNESS_OFF first.
 	 */
-	if (test_and_clear_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags))
+	if (test_and_clear_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags)) {
 		set_brightness_delayed_set_brightness(led_cdev, LED_OFF);
+		/*
+		 * The consecutives led_set_brightness(LED_OFF),
+		 * led_set_brightness(LED_FULL) could have been executed out of
+		 * order (LED_FULL first), if the work_flags has been set
+		 * between LED_SET_BRIGHTNESS_OFF and LED_SET_BRIGHTNESS of this
+		 * work. To avoid ending with the LED turned off, turn the LED
+		 * on again.
+		 */
+		if (led_cdev->delayed_set_value != LED_OFF)
+			set_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags);
+	}
 
 	if (test_and_clear_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags))
 		set_brightness_delayed_set_brightness(led_cdev, led_cdev->delayed_set_value);
@@ -234,7 +245,7 @@ void led_blink_set(struct led_classdev *led_cdev,
 		   unsigned long *delay_on,
 		   unsigned long *delay_off)
 {
-	del_timer_sync(&led_cdev->blink_timer);
+	timer_delete_sync(&led_cdev->blink_timer);
 
 	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
 	clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
@@ -283,7 +294,7 @@ EXPORT_SYMBOL_GPL(led_blink_set_nosleep);
 
 void led_stop_software_blink(struct led_classdev *led_cdev)
 {
-	del_timer_sync(&led_cdev->blink_timer);
+	timer_delete_sync(&led_cdev->blink_timer);
 	led_cdev->blink_delay_on = 0;
 	led_cdev->blink_delay_off = 0;
 	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
@@ -331,10 +342,13 @@ void led_set_brightness_nopm(struct led_classdev *led_cdev, unsigned int value)
 	 * change is done immediately afterwards (before the work runs),
 	 * it uses a separate work_flag.
 	 */
-	if (value) {
-		led_cdev->delayed_set_value = value;
+	led_cdev->delayed_set_value = value;
+	/* Ensure delayed_set_value is seen before work_flags modification */
+	smp_mb__before_atomic();
+
+	if (value)
 		set_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags);
-	} else {
+	else {
 		clear_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags);
 		clear_bit(LED_SET_BLINK, &led_cdev->work_flags);
 		set_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags);