linux-kernel - Re: [PATCH v4 1/5] watchdog: f71808e_wdt: fix inaccurate report in WDIOC

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Date:   Sun, 25 Jul 2021 14:41:29 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/5] watchdog: f71808e_wdt: fix inaccurate report in
 WDIOC_GETTIMEOUT

On Thu, Jul 22, 2021 at 12:14:40PM +0200, Ahmad Fatoum wrote:
> The fintek watchdog timer can configure timeouts of second granularity
> only up to 255 seconds. Beyond that, the timeout needs to be configured
> with minute granularity. WDIOC_GETTIMEOUT should report the actual
> timeout configured, not just echo back the timeout configured by the
> user. Do so.
> 
> Fixes: 96cb4eb019ce ("watchdog: f71808e_wdt: new watchdog driver for Fintek F71808E and F71882FG")
> Suggested-by: Guenter Roeck <linux@...ck-us.net>
> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/watchdog/f71808e_wdt.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/f71808e_wdt.c b/drivers/watchdog/f71808e_wdt.c
> index f60beec1bbae..f7d82d261913 100644
> --- a/drivers/watchdog/f71808e_wdt.c
> +++ b/drivers/watchdog/f71808e_wdt.c
> @@ -228,15 +228,17 @@ static int watchdog_set_timeout(int timeout)
>  
>  	mutex_lock(&watchdog.lock);
>  
> -	watchdog.timeout = timeout;
>  	if (timeout > 0xff) {
>  		watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
>  		watchdog.minutes_mode = true;
> +		timeout = watchdog.timer_val * 60;
>  	} else {
>  		watchdog.timer_val = timeout;
>  		watchdog.minutes_mode = false;
>  	}
>  
> +	watchdog.timeout = timeout;
> +
>  	mutex_unlock(&watchdog.lock);
>  
>  	return 0;
> -- 
> git-series 0.9.1