linux-kernel - Re: [PATCH] parport_pc: after superio probing restore original register values

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Date:	Mon, 15 Jun 2009 22:58:26 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jens Rottmann <JRottmann@...PERTEmbedded.de>
Cc:	linux-parport@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] parport_pc: after superio probing restore original
 register values

On Mon, 15 Jun 2009 19:33:52 +0200
Jens Rottmann <JRottmann@...PERTEmbedded.de> wrote:

> CONFIG_PARPORT_PC_SUPERIO probes for various superio chips by writing
> byte sequences to a set of different potential I/O ranges.  But the
> probed ranges are not exclusive to parallel ports.  Some of our boards
> just happen to have a watchdog in one of them.  Took us almost a week
> to figure out why some distros reboot without warning after running
> flawlessly for 3 hours.  For exactly 170 = 0xAA minutes, that is ...

Ouch - that must have been a pig to find.

> Fixed by restoring original values after probing.  Also fixed too small
> request_region() in detect_and_report_it87().
> 
> Signed-off-by: Jens Rottmann <JRottmann@...PERTEmbedded.de>

Will queue for Linus

Alan
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