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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>
This commit is contained in:
Fabio Baltieri 2012-06-07 03:12:34 +08:00 committed by Bryan Wu
parent 3740e49c66
commit 437864828d
1 changed files with 6 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/leds/led-core.c
View File

@ -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);