linux-kernel - Re: [PATCH RFC] watchdog: add a new driver for VIA chipsets

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Date:	Wed, 23 Nov 2011 11:49:26 +0100
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Marc Vertes <marc.vertes@...fox.com>
Cc:	broonie@...nsource.wolfsonmicro.com, wim@...ana.be,
	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
	HaraldWelte@...tech.com
Subject: Re: [PATCH RFC] watchdog: add a new driver for VIA chipsets

(BTW I removed a few duplicates from the CC list)

> A question regarding "nowayout", in the case of this VIA chipset where
> a watchdog can not be stopped once started from BIOS. I think I should
> set unconditionally WDOG_NO_WAY_OUT in status, shouldn't I ?
> 
> I also do not think it is correct to implement a timer and ping
> proactively in case of magicclose because 1) it complicates a bit the
> code, 2) there is no way to know the timeout value, and it set very low
> in the BIOS (1 s).

Yup, I'd accept the reason that you can't know the timeout value and
then setting NO_WAY_OUT unconditionally looks like the thing to do here.

@Wim: Would you accept drivers which can only ping a watchdog but
neither start/stop it?

@Marc: If he does, would you be interested in updating the watchdog-core
so that no start()/stop() will also be accepted if there is a ping()?

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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