commit c501ae7f332cdaf42e31af30b72b4b66cbbb1604
Author: Chris Wilson <ch...@chris-wilson.co.uk>
Date:   Wed Dec 14 13:57:23 2011 +0100

    drm/i915: Only clear the GPU domains upon a successful finish
    
    By clearing the GPU read domains before waiting upon the buffer, we run
    the risk of the wait being interrupted and the domains prematurely
    cleared. The next time we attempt to wait upon the buffer (after
    userspace handles the signal), we believe that the buffer is idle and so
    skip the wait.
    
    There are a number of bugs across all generations which show signs of an
    overly haste reuse of active buffers.

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Title:
  [sandybridge-gt1] False GPU lockup  render.IPEHR: 0x7a000003

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