Re: VGA PCI IO port reservations

[H. Peter Anvin]

Followup to:  <[EMAIL PROTECTED]>
By author:    Olivier Galibert <[EMAIL PROTECTED]>
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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"Unix gives you enough rope to shoot yourself in the foot."
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