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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: George Cherian <gcherian@marvell.com>,
	"linux@roeck-us.net" <linux@roeck-us.net>
Cc: "wim@linux-watchdog.org" <wim@linux-watchdog.org>,
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	"Pengutronix Kernel Team" <kernel@pengutronix.de>
Subject: Re: [PATCH v4 1/2] watchdog: Add a new flag WDIOF_STOP_MAYSLEEP
Date: Wed, 5 Mar 2025 12:01:53 +0100	[thread overview]
Message-ID: <7ac2b8db-22c7-4168-b1b7-4f9f0ab10531@pengutronix.de> (raw)
In-Reply-To: <PH8PR18MB538122CE6706872B8A836A94C5CB2@PH8PR18MB5381.namprd18.prod.outlook.com>

Hi George,
Hi Guenter,

On 05.03.25 11:34, George Cherian wrote:
>> why is armada_37xx_wdt also here?
>> The stop function in that driver may not sleep.
> Marek,
> 
> Thanks for reviewing.
> Since the stop function has a regmap_write(), I thought it might sleep.
> Now that you pointed it out, I assume that it is an MMIO based regmap being used for armada.
> I will update the same in the next version

Failure to add WDIOF_STOP_MAYSLEEP when it's needed can lead to
kernel hanging. Failure to add an alternative WDIOF_STOP_ATOMIC
would lead to the kernel option being a no-op.

I think a no-op stop_on_panic (or reset_on_panic) is a saner default.

Cheers,
Ahmad

> 
>>
>> Marek
> 
> -George


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  reply	other threads:[~2025-03-05 11:03 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-03-05 10:10 [PATCH v4 0/2] Add stop_on_panic support for watchdog George Cherian
2025-03-05 10:10 ` [PATCH v4 1/2] watchdog: Add a new flag WDIOF_STOP_MAYSLEEP George Cherian
2025-03-05 10:18   ` Marek Behún
2025-03-05 10:34     ` George Cherian
2025-03-05 11:01       ` Ahmad Fatoum [this message]
2025-03-05 23:58         ` Guenter Roeck
2025-03-06 12:18           ` [EXTERNAL] " George Cherian
2025-03-06 17:22             ` Guenter Roeck
2025-03-05 10:30   ` Andy Shevchenko
2025-03-05 22:50   ` Julius Werner
2025-03-06  9:40     ` George Cherian
2025-03-05 23:03   ` Guenter Roeck
2025-03-05 10:10 ` [PATCH v4 2/2] drivers: watchdog: Add support for panic notifier callback George Cherian
2025-03-05 10:33   ` Andy Shevchenko
2025-03-06  0:00     ` Guenter Roeck
2025-03-05 10:31 ` [PATCH v4 0/2] Add stop_on_panic support for watchdog Andy Shevchenko
2025-03-05 10:41 ` Ahmad Fatoum
2025-03-05 11:28   ` [EXTERNAL] " George Cherian
2025-03-05 11:39     ` Ahmad Fatoum
2025-03-05 12:15       ` George Cherian
2025-03-05 12:23         ` Ahmad Fatoum

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