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

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Message-ID: <85c2c85e-147c-b54e-e84d-10b989610979@siemens.com>
Date:   Mon, 30 Aug 2021 21:47:44 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-watchdog@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Christian Storm <christian.storm@...mens.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Mantas Mikulėnas <grawity@...il.com>
Subject: Re: [PATCH] watchdog: iTCO_wdt: Fix detection of SMI-off case

On 20.08.21 15:45, Jan Kiszka 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: */
>>
> 
> Ping, this is still missing in master. Stable kernels had the revert,
> but 5.14 will need this.
> 

Second reminder: 5.14 is out and now broken. Is the patch queued
somewhere? I do not see it in the watchdog staging branch.

Jan

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