Re: [PATCH] Clarify pci_iomap() usage for MMIO-only devices

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> If you use ioport_map/unmap, then you really *should* access them with the 
> proper iomem accessors (ioread/iowrite). The fact that it may happen to 
> work (when using the default lib/iomap.c implementation, at least) on 
> some architectures and with the current implementation still doesn't mean 
> that you should necessarily use readb/writeb.

Another reason we should enforce the use of ioread/iowrite is that some
platforms do daft things like map mmio type devices through indirect
register access. Sparc PCMCIA is a classic example. The only sane way to
make these work is to require ioread/iowrite is used with iomap

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