Re: Weirdness in pci_read_bases()

[Alan Cox]

> The main question regarding 0 in a BAR is do we know of devices that
> consider it as "disabled" and don't operate/decode 0 ? (That would be
> gross and out of spec but who knows...)

In the PC world it never gets tested so it might be wise to be cautious.

> But that can be solved, using something akin to IORESOURCE_UNSET, like
> we do on powerpc, generalizing it, and having an x86-specific quirk set
> it on anything that comes up with resource->start == 0.

And add pci_resource_unassigned() to wrap it nicely. That would
definitely be a good thing as we have confusion right now and it has
turned up in the real world.

Alan
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