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drm/i915: Zap mmaps of objects before unbinding them from the GTT.
authorEric Anholt <eric@anholt.net>
Wed, 9 Sep 2009 18:50:45 +0000 (11:50 -0700)
committerEric Anholt <eric@anholt.net>
Wed, 9 Sep 2009 19:52:05 +0000 (12:52 -0700)
Otherwise, some other userland writing into its buffer may race to land
writes either after the CPU thinks it's got a coherent view, or after its
GTT entries have been redirected to point at the scratch page.  Either
result is unpleasant.

Signed-off-by: Eric Anholt <eric@anholt.net>

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