linux-kernel - Re: [PATCH] watchdog: add support for w83697hg chip

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Message-ID: <20060906194149.GA2386@infomag.infomag.iguana.be>
Date:	Wed, 6 Sep 2006 21:41:49 +0200
From:	Wim Van Sebroeck <wim@...ana.be>
To:	Samuel Tardieu <sam@...1149.net>
Cc:	Pádraig Brady <P@...igBrady.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: add support for w83697hg chip

Hi All,

> | So in the case the BIOS sets the watchdog to 4 mins
> | for example the 2 drivers are a little different.
> | 
> | W83627HF resets to timeout seconds on module load
> | W83697HG resets to timeout seconds on /dev/watchdog open
> 
> Yes, I'm reluctant at changing anything set by the BIOS before the first
> *use* of the module. In particular, if the watchdog was not activated by
> default in the BIOS, I'd prefer the box not to reboot just because the
> module was loaded (maybe by mistake) if no daemon open /dev/watchdog
> at least once.

My feedback: it is important that during the initialization of the module,
the watchdog is being disabled. A watchdog should only start working after
it has been started via /dev/watchdog.

> In particular, some boxes may take a long time to boot, e.g. if fscks are
> needed; if the module is loaded by an initrd before filesystems are mounted
> and fscks are done, if I'm not mistaken the box could reboot in loop
> every time in the middle of fscks.

Please note that I added 4 days ago a patch of Marcus Junker <junker@...uras.de>
in my linux-2.6-watchdog-mm tree for the w83697hf chipset.
See: http://www.kernel.org/git/?p=linux/kernel/git/wim/linux-2.6-watchdog-mm.git;a=commitdiff;h=d19ea38e6e99c4924c894cb54440e242179bf27d;hp=19cdb014d58f2c47470d86188a7e556380469008

Greetings,
Wim.

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