linux-kernel - Re: [PATCH] watchdog: dw

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Message-ID: <20221118220834.GC685644@roeck-us.net>
Date:   Fri, 18 Nov 2022 14:08:34 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Cosmin Tanislav <demonsingur@...il.com>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Cosmin Tanislav <cosmin.tanislav@...log.com>
Subject: Re: [PATCH] watchdog: dw_wdt: stop on reboot

On Fri, Nov 18, 2022 at 05:08:09PM +0200, Cosmin Tanislav wrote:
> HW running watchdogs are just watchdogs that are enabled before the
> Linux driver is probed, usually by the bootloader (eg. U-Boot).
> 
> When the system is shutting down, the mechanism for keeping a HW running
> watchdog pinged is also stopped, but the watchdog itself is not stopped,
> causing a reset, and preventing the system from being shut down.
> 
> Opt into stopping watchdogs on reboot.
> 
> Signed-off-by: Cosmin Tanislav <cosmin.tanislav@...log.com>

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

> ---
>  drivers/watchdog/dw_wdt.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
> index 52962e8d11a6..462f15bd5ffa 100644
> --- a/drivers/watchdog/dw_wdt.c
> +++ b/drivers/watchdog/dw_wdt.c
> @@ -663,6 +663,7 @@ static int dw_wdt_drv_probe(struct platform_device *pdev)
>  	platform_set_drvdata(pdev, dw_wdt);
>  
>  	watchdog_set_restart_priority(wdd, 128);
> +	watchdog_stop_on_reboot(wdd);
>  
>  	ret = watchdog_register_device(wdd);
>  	if (ret)
> -- 
> 2.38.1
>