linux-kernel - Re: [PATCH] watchdog: core: stop watchdog when executing poweroff command

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Message-ID: <5a6cb162-790a-d24a-8946-090f4a893cf7@roeck-us.net>
Date:   Thu, 29 Jun 2023 22:44:37 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Meng Li <Meng.Li@...driver.com>, wim@...ux-watchdog.org,
        linux-watchdog@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: core: stop watchdog when executing poweroff
 command

On 6/29/23 22:39, Meng Li wrote:
> From: Meng Li <meng.li@...driver.com>
> 
> On some platforms, for example, Intel SoC FPGA platform, the watchdog is
> started in from u-boot, and so kernel will create a timer and work to
> keep watchdog alive. .But when user executes commands "poweroff" or
> "shutdown -h", the system is reset when watchdog triggers timeout even
> if WDOG_STOP_ON_REBOOT is set in watchdog driver. The root cause is
> that the watchdog not stopped properly because the SYS_POWER_OFF case
> is not supported in nofify callback function. So, add this case to stop
> watchdog when executing poweroff command.
> 
> Signed-off-by: Meng Li <Meng.Li@...driver.com>

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

> ---
>   drivers/watchdog/watchdog_core.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
> index d4c5a736fdcb..5b55ccae06d4 100644
> --- a/drivers/watchdog/watchdog_core.c
> +++ b/drivers/watchdog/watchdog_core.c
> @@ -161,7 +161,7 @@ static int watchdog_reboot_notifier(struct notifier_block *nb,
>   	struct watchdog_device *wdd;
>   
>   	wdd = container_of(nb, struct watchdog_device, reboot_nb);
> -	if (code == SYS_DOWN || code == SYS_HALT) {
> +	if (code == SYS_DOWN || code == SYS_HALT || code == SYS_POWER_OFF) {
>   		if (watchdog_hw_running(wdd)) {
>   			int ret;
>