linux-kernel - Re: AT91SAM9/CAP9 watchdog driver

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Date:	Wed, 4 Jun 2008 20:36:05 +0200
From:	"Andrew Victor" <avictor.za@...il.com>
To:	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>, wim@...ana.be,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: AT91SAM9/CAP9 watchdog driver

hi Alan,

>> Since the watchdog registers are Write-Once, if the user does not
>> specify a "wdt_timeout" parameter we'd still like the driver to load
>> even if it's not enabled.
>
> Surely you can avoid doing the register writes until after you check the
> validity of arguments ?

The validity of the timeout value is checked in at91_wdt_settimeout().
 It returns -EINVAL if the timeout value is invalid.

The issue above is rather that probe() should not fail if
at91_wdt_settimeout() returns -EINVAL, since we'd like the
driver/module to still load to allow the user to later specify a valid
timeout via ioctl(WDIOC_SETTIMEOUT).


Regards,
  Andrew Victor
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