leds: fix led_brightness_set when soft-blinking
Move led_stop_software_blink() code into led_brightness_set() to ensure
software blink timer is stopped and cleared when changing trigger.
Also use led_set_brightness() instead of calling
led_cdev->brightness_set() directly to keep led_cdev->brightness
consistent with current LED status.
This ensure proper cleaning when changing triggers, as without this fix
a LED may be turned off while leaving it's led_cdev->brightness = 1,
leading to an erratic software-blink behaviour.
The problem was easy to reproduce by changing the trigger from "timer"
to "oneshot".
Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index a6f4d91..31f1f78 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -24,13 +24,6 @@
LIST_HEAD(leds_list);
EXPORT_SYMBOL_GPL(leds_list);
-static void led_stop_software_blink(struct led_classdev *led_cdev)
-{
- /* deactivate previous settings */
- led_cdev->blink_delay_on = 0;
- led_cdev->blink_delay_off = 0;
-}
-
static void led_set_software_blink(struct led_classdev *led_cdev,
unsigned long delay_on,
unsigned long delay_off)
@@ -113,7 +106,11 @@
void led_brightness_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
- led_stop_software_blink(led_cdev);
- led_cdev->brightness_set(led_cdev, brightness);
+ /* stop and clear soft-blink timer */
+ del_timer_sync(&led_cdev->blink_timer);
+ led_cdev->blink_delay_on = 0;
+ led_cdev->blink_delay_off = 0;
+
+ led_set_brightness(led_cdev, brightness);
}
EXPORT_SYMBOL(led_brightness_set);
