linux-kernel - RE: [PATCH 3/3] watchdog: da9062: No need to ping manually before setting timeout

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <AM6PR10MB226301829B873FFEFE845FE180C90@AM6PR10MB2263.EURPRD10.PROD.OUTLOOK.COM>
Date:   Wed, 1 Apr 2020 10:20:32 +0000
From:   Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:     Stefan Riedmueller <s.riedmueller@...tec.de>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Support Opensource <Support.Opensource@...semi.com>
CC:     "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/3] watchdog: da9062: No need to ping manually before
 setting timeout

On 26 March 2020 15:02, Stefan Riedmueller wrote:

> There is actually no need to ping the watchdog before disabling it
> during timeout change. Disabling the watchdog already takes care of
> resetting the counter.
> 
> This fixes an issue during boot when the userspace watchdog handler takes
> over and the watchdog is already running. Opening the watchdog in this case
> leads to the first ping and directly after that without the required
> heartbeat delay a second ping issued by the set_timeout call. Due to the
> missing delay this resulted in a reset.
> 
> Signed-off-by: Stefan Riedmueller <s.riedmueller@...tec.de>

Thanks for the update:

Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>

> ---
>  drivers/watchdog/da9062_wdt.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c
> index 6d81b1276b87..c5bd075c8b14 100644
> --- a/drivers/watchdog/da9062_wdt.c
> +++ b/drivers/watchdog/da9062_wdt.c
> @@ -66,11 +66,6 @@ static int da9062_wdt_update_timeout_register(struct
> da9062_watchdog *wdt,
>  					      unsigned int regval)
>  {
>  	struct da9062 *chip = wdt->hw;
> -	int ret;
> -
> -	ret = da9062_reset_watchdog_timer(wdt);
> -	if (ret)
> -		return ret;
> 
>  	regmap_update_bits(chip->regmap,
>  				  DA9062AA_CONTROL_D,
> --
> 2.23.0