drm/fb_helper: prevent some troubles waiting to happen

Ilija Hadzic ihadzic at research.bell-labs.com
Tue Oct 25 18:57:17 PDT 2011

The following two patches address potential problems that I 
called "troubles waiting to happen" in this note

I didn't hear anyone take on my question, so I figured I would just send
the patches. I tested the patches on a variety of AMD cards that I have.
I don't have other GPUs handy.

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