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From
SubjectRe: VGA PCI IO port reservations
Date
Followup to:  <20001117202009.B2472@zalem.puupuu.org>
By author: Olivier Galibert <galibert@pobox.com>
In newsgroup: linux.dev.kernel
>
> What guarantees you that:
> 1- No device will respond 0xffff for an address it decodes
> 2- No device will crap up on you simply because you've read one
> particular address
>
> If any of these if true for any device out there (I think I have one
> in my computer that does the 1/ part in some cases), your code is
> unsafe.
>

It is. There are plenty of devices for which an arbitrary IN is an
irrecoverable state transition.

-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt
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