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
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