[Linux-parport] [PATCH] parport_pc: after superio probing restore original register values
alan at lxorguk.ukuu.org.uk
Mon Jun 15 17:58:26 EDT 2009
On Mon, 15 Jun 2009 19:33:52 +0200
Jens Rottmann <JRottmann at LiPPERTEmbedded.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 at LiPPERTEmbedded.de>
Will queue for Linus
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