fix the prime lock deadlock

Dave Airlie airlied at gmail.com
Wed Oct 14 18:51:37 PDT 2015


The first two patches are cleanups, the second two attempt
to fix the deadlock on the prime lock, in the failure paths.

Patch 3 is based on a proposal from Daniel Vetter.

I've ran these under virgl and I can't reproduce the deadlock
there.

Dave.



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