linux-kernel - Re: [PATCH] watchdog: sp805: disable watchdog on remove

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Date:   Sat, 2 Apr 2022 22:41:20 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eliav Farber <farbere@...zon.com>, wim@...ux-watchdog.org,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     ronenk@...zon.com, talel@...zon.com, hhhawa@...zon.com,
        jonnyc@...zon.com, hanochu@...zon.com, dwmw@...zon.co.uk
Subject: Re: [PATCH] watchdog: sp805: disable watchdog on remove

On 4/2/22 22:22, Eliav Farber wrote:
> Disable the watchdog if it is active while removing the module.
> It is necessary in order to prevent a reset in case watchdog
> hw was running before the removal.
> 
> Signed-off-by: Eliav Farber <farbere@...zon.com>
> ---
>   drivers/watchdog/sp805_wdt.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c
> index d8876fba686d..d7dc0f3f16ec 100644
> --- a/drivers/watchdog/sp805_wdt.c
> +++ b/drivers/watchdog/sp805_wdt.c
> @@ -311,6 +311,9 @@ static int sp805_wdt_remove(struct amba_device *adev)
>   {
>   	struct sp805_wdt *wdt = amba_get_drvdata(adev);
>   
> +	if (watchdog_active(&wdt->wdd))
> +		wdt_disable(&wdt->wdd);
> +

Why not use watchdog_stop_on_unregister() ?

Guenter

>   	watchdog_unregister_device(&wdt->wdd);
>   	watchdog_set_drvdata(&wdt->wdd, NULL);
>