linux-kernel - [PATCH 2/2] leds: turn the blink_timer off before starting to blink

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Message-Id: <1317938611-4418-3-git-send-email-ospite@studenti.unina.it>
Date:	Fri,  7 Oct 2011 00:03:31 +0200
From:	Antonio Ospite <ospite@...denti.unina.it>
To:	Richard Purdie <rpurdie@...ys.net>
Cc:	Antonio Ospite <ospite@...denti.unina.it>,
	Johannes Berg <johannes.berg@...el.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] leds: turn the blink_timer off before starting to blink

Depending on the implementation of the hardware blinking function in
blink_set(), the led can support hardware blinking for some values of
delay_on and delay_off and fall-back to software blinking for some other
values.

Turning off the blink_timer unconditionally before starting to blink 
make sure that a sequence like:

  OFF
  hardware blinking
  software blinking
  hardware blinking

does not leave the software blinking timer active.

Signed-off-by: Antonio Ospite <ospite@...denti.unina.it>
---
 drivers/leds/led-class.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 939f24a..a7f0b29 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -266,6 +266,8 @@ void led_blink_set(struct led_classdev *led_cdev,
 		   unsigned long *delay_on,
 		   unsigned long *delay_off)
 {
+	del_timer_sync(&led_cdev->blink_timer);
+
 	if (led_cdev->blink_set &&
 	    !led_cdev->blink_set(led_cdev, delay_on, delay_off)) {
 		led_cdev->blink_delay_on = *delay_on;
-- 
1.7.6.3

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