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drm/nouveau: use shared fences for readable objects
authorMaarten Lankhorst <maarten.lankhorst@canonical.com>
Wed, 9 Apr 2014 14:19:30 +0000 (16:19 +0200)
committerMaarten Lankhorst <maarten.lankhorst@canonical.com>
Tue, 2 Sep 2014 15:28:48 +0000 (17:28 +0200)
nouveau keeps track in userspace whether a buffer is being
written to or being read, but it doesn't use that information.

Change this to allow multiple readers on the same bo.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Ben Skeggs <bskeggs@redhat.com>

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