pci_lock and runtime resume

[Dave Airlie]

So I've just been looking a bit more at dynamic PM for graphics and
noticed that when userspace reads pci config space, the read happens
under the pci_lock which is a spinlock.
Now on most of the GPU drivers we'll be entering standard s/r paths
which don't have this restriction from what I can see, I get to see
lots of scheduling while atomic fun, that I'm not really sure I can
fix nicely.

Dave.
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