linux-kernel - [040/262] leds: turn the blink_timer off before starting to blink

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Date:	Wed, 09 Nov 2011 13:26:02 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Antonio Ospite <ospite@...denti.unina.it>,
	Richard Purdie <rpurdie@...ys.net>
Subject: [040/262] leds: turn the blink_timer off before starting to blink

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Antonio Ospite <ospite@...denti.unina.it>

commit 488bc35bf40df89d37486c1826b178a2fba36ce7 upstream.

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>
Reviewed-by: Johannes Berg <johannes@...solutions.net>
Cc: Richard Purdie <rpurdie@...ys.net>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/leds/led-class.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -267,6 +267,8 @@ void led_blink_set(struct led_classdev *
 		   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;


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