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On the out-fence side we get fence returned by the submitted draw call and attach it to a sync_file and send the sync_file fd to userspace. On error -1 is returned to userspace. Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com> Signed-off-by: Robert Foss <robert.foss@collabora.com> Suggested-by: Rob Herring <robh@kernel.org>