drm/i915: Only wait on a pending flip if we intend to write to the buffer
authorChris Wilson <chris@chris-wilson.co.uk>
Sun, 6 Mar 2011 13:51:29 +0000 (13:51 +0000)
committerChris Wilson <chris@chris-wilson.co.uk>
Mon, 7 Mar 2011 11:06:02 +0000 (11:06 +0000)
... as if we are only reading from it, we can do that concurrently with
the queue flip.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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