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authorFabio Baltieri <fabio.baltieri@gmail.com>2012-06-07 03:12:34 +0800
committerBryan Wu <bryan.wu@canonical.com>2012-07-24 07:52:34 +0800
commit437864828d82b9dee50b5741106fbf5fa12b139a (patch)
tree356c64833d43ff01b36277aa7bcf556e6ee367b1 /drivers/leds
parent3740e49c668bbe7719f292c24c4c5f152a88b97e (diff)
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>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/led-core.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index a6f4d910ca0..31f1f78ef40 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -24,13 +24,6 @@ EXPORT_SYMBOL_GPL(leds_list_lock);
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 @@ EXPORT_SYMBOL(led_blink_set_oneshot);
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);