Re: [PATCH] fbdev: suppress warning when assigningvga-save/restore base

From: David Miller
Date: Sun Aug 04 2013 - 21:51:57 EST

From: "H. Peter Anvin" <hpa@xxxxxxxxx>
Date: Sun, 04 Aug 2013 10:33:46 -0700

> Anyone who can dig backwards and summarize? In other words:
> Where in the current code do we stuff a physical address in a pointer,
> or a virtual address into a non-pointer?

The VGA register accessors try to accomodate iomem and ioport

If they are given a non-NULL iomem pointer 'regbase' they use
iomem accesses, otherwise they do direct ISA port poking.

And yes the drivers in question are making some brash assumptions.
I suspect they should be using ioremap() or similar.
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