linux-kernel - Re: [PATCH] Revert "leds: save the delay values after a successful call to blink

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Message-Id: <20111116222100.323aa751b8a19c0fc2e08a97@studenti.unina.it>
Date:	Wed, 16 Nov 2011 22:21:00 +0100
From:	Antonio Ospite <ospite@...denti.unina.it>
To:	Johan Hovold <jhovold@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Berg <johannes@...solutions.net>,
	Richard Purdie <rpurdie@...ys.net>, stable@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert
 "leds: save the delay values after a successful call to blink_set()"

On Mon,  7 Nov 2011 11:36:37 +0100
Johan Hovold <jhovold@...il.com> wrote:

> This reverts commit 6123b0e274503a0d3588e84fbe07c9aa01bfaf5d.
> 
> The problem this patch intends to solve has already been fixed by commit
> 7a5caabd090b8f7 (drivers/leds/ledtrig-timer.c: fix broken sysfs delay
> handling).
> 
> Signed-off-by: Johan Hovold <jhovold@...il.com>

Sorry for not replying earlier, I was on vacation.

Thanks Johan, I've just verified the timer trigger works fine on 3.1
indeed even without my changes. But keep reading, please.

> ---
> 
> Hi, 
> 
> A fix for the problem with the delay parameters not being stored is already in
> 3.1 (and stable). Rather than storing both values at every call to
> led_blink_set only the updated value is stored in led_delay_{on,off}_store in
> ledtrig-timer.c.
>

I thought that this was better fixed in the led_blink_set() directly,
as delay_on and delay_off are led_cdev fields after all, not
necessarily specific to ledtrig-timer, what about other users of them?
For example I can see led_blink_set() used in: net/mac80211/led.c
and led_trigger_blink(), which uses led_blink_set() in:
drivers/power/power_supply_leds.c

Maybe I am missing something.

Regards,
   Antonio

> Thanks,
> Johan
> 
>  drivers/leds/led-class.c |    5 +----
>  1 files changed, 1 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
> index 661b692..6d5628b 100644
> --- a/drivers/leds/led-class.c
> +++ b/drivers/leds/led-class.c
> @@ -270,11 +270,8 @@ void led_blink_set(struct led_classdev *led_cdev,
>  	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;
> -		led_cdev->blink_delay_off = *delay_off;
> +	    !led_cdev->blink_set(led_cdev, delay_on, delay_off))
>  		return;
> -	}
>  
>  	/* blink with 1 Hz as default if nothing specified */
>  	if (!*delay_on && !*delay_off)
> -- 
> 1.7.6
> 
> 

-- 
Antonio Ospite
http://ao2.it

PGP public key ID: 0x4553B001

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