[PATCH v2] watchdog: fix watchdog_set_timeout breakage for drivers like imxwd

[Sascha Hauer]

On Wed, Aug 19, 2020 at 11:02:31AM +0200, Ahmad Fatoum wrote:
> Commit 0b944fce55f4 ("watchdog: permit `wd 0` for non-stoppable, but
> inactive, watchdogs") silently broke use of watchdogs, that report
> being inactive at driver probe time, altogether.
> Because those always had watchdog_hw_running evaluating to false,
> it early exited without a chance to ever actually set the timeout
> (and for watchdog_hw_running to evaluate to != false).
> 
> This results in following watchdog drivers being broken in v2020.08.0:
> 
>  - imxwd
>  - f71808e_wdt
>  - at91sam9_wdt
> 
> Fixes: 0b944fce55f4 ("watchdog: permit `wd 0` for non-stoppable, but inactive, watchdogs")
> Reported-by: Bastian Krause <bst at pengutronix.de>
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---

Applied to master, thanks

Sascha

> v1 -> v2:
>  - made commit message about scope of breakage more accurate
>  - moved check back to top, but in fixed form, as suggested by Sascha
> ---
>  drivers/watchdog/wd_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/wd_core.c b/drivers/watchdog/wd_core.c
> index ab1dcaa40a3a..665338af6197 100644
> --- a/drivers/watchdog/wd_core.c
> +++ b/drivers/watchdog/wd_core.c
> @@ -45,7 +45,7 @@ int watchdog_set_timeout(struct watchdog *wd, unsigned timeout)
>  	if (timeout > wd->timeout_max)
>  		return -EINVAL;
>  
> -	if (watchdog_hw_running(wd) == false)
> +	if (!timeout && !watchdog_hw_running(wd))
>  		return 0;
>  
>  	pr_debug("setting timeout on %s to %ds\n", watchdog_name(wd), timeout);
> -- 
> 2.28.0
> 
> 
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