linux-kernel - Re: [PATCH] watchdog: iTCO_wdt: Fix detection of SMI-off case

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Message-ID: <49ce8c0c-b34d-d14c-9c9b-4eef4c991826@roeck-us.net>
Date:   Mon, 26 Jul 2021 06:51:02 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Jan Kiszka <jan.kiszka@...mens.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc:     linux-watchdog@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Christian Storm <christian.storm@...mens.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Mantas Mikulėnas <grawity@...il.com>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH] watchdog: iTCO_wdt: Fix detection of SMI-off case

On 7/26/21 5:05 AM, Jan Kiszka wrote:
> On 26.07.21 14:03, Paolo Bonzini wrote:
>> On 26/07/21 13:46, Jan Kiszka wrote:
>>> From: Jan Kiszka <jan.kiszka@...mens.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@...il.com>
>>> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.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@...hat.com>
>> Cc: stable@...r.kernel.org
>>
>> (the latter because cb011044e34c has been picked up by stable kernels
>> already).
>>
> 
> Thanks. Originally wanted to add stable myself, but I'm still unsure
> whether this is the privilege of the subsystem maintainer or should also
> be done by contributors.
> 

Normally it is done by maintainers.

Guenter