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From: Paolo Bonzini <pbonzini@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>,
	Wim Van Sebroeck <wim@linux-watchdog.org>,
	Guenter Roeck <linux@roeck-us.net>
Cc: linux-watchdog@vger.kernel.org,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Christian Storm" <christian.storm@siemens.com>,
	"Andy Shevchenko" <andy.shevchenko@gmail.com>,
	"Mantas Mikulėnas" <grawity@gmail.com>,
	stable <stable@vger.kernel.org>
Subject: Re: [PATCH] watchdog: iTCO_wdt: Fix detection of SMI-off case
Date: Mon, 26 Jul 2021 14:03:25 +0200	[thread overview]
Message-ID: <b3b75b72-33d4-ce21-a8f4-77a37156aa9e@redhat.com> (raw)
In-Reply-To: <d84f8e06-f646-8b43-d063-fb11f4827044@siemens.com>

On 26/07/21 13:46, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@siemens.com>
> 
> Obviously, the test needs to run against the register content, not its
> address.
> 
> Fixes: cb011044e34c ("watchdog: iTCO_wdt: Account for rebooting on second timeout")
> Reported-by: Mantas Mikulėnas <grawity@gmail.com>
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> ---
>   drivers/watchdog/iTCO_wdt.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
> index b3f604669e2c..643c6c2d0b72 100644
> --- a/drivers/watchdog/iTCO_wdt.c
> +++ b/drivers/watchdog/iTCO_wdt.c
> @@ -362,7 +362,7 @@ static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t)
>   	 * Otherwise, the BIOS generally reboots when the SMI triggers.
>   	 */
>   	if (p->smi_res &&
> -	    (SMI_EN(p) & (TCO_EN | GBL_SMI_EN)) != (TCO_EN | GBL_SMI_EN))
> +	    (inl(SMI_EN(p)) & (TCO_EN | GBL_SMI_EN)) != (TCO_EN | GBL_SMI_EN))
>   		tmrval /= 2;
>   
>   	/* from the specs: */
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: stable@vger.kernel.org

(the latter because cb011044e34c has been picked up by stable kernels 
already).

Paolo


  parent reply	other threads:[~2021-07-26 12:03 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-26 11:46 Jan Kiszka
2021-07-26 12:01 ` Andy Shevchenko
2021-07-26 12:04   ` Jan Kiszka
2021-07-26 13:40     ` Andy Shevchenko
2021-07-26 13:59       ` Guenter Roeck
2021-07-26 14:05         ` Jan Kiszka
2021-07-26 14:51           ` Andy Shevchenko
2021-07-26 17:10             ` Jan Kiszka
2021-07-26 21:45               ` Andy Shevchenko
2021-07-26 12:03 ` Paolo Bonzini [this message]
2021-07-26 12:05   ` Jan Kiszka
2021-07-26 13:51     ` Guenter Roeck
2021-07-26 13:44 ` Guenter Roeck
2021-07-26 16:59 ` Mantas Mikulėnas
2021-08-20 13:45 ` Jan Kiszka
2021-08-30 19:47   ` Jan Kiszka
2021-08-30 20:00     ` Guenter Roeck
2021-09-07 20:14       ` Wim Van Sebroeck

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