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drm/vc4: Fix race between page flip completion event and clean-up
There was a small window where a userspace program could submit a pageflip after receiving a pageflip completion event yet still receive EBUSY. Signed-off-by: Derek Foreman <derekf@osg.samsung.com> Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Daniel Stone <daniels@collabora.com> (cherry picked from commit 26fc78f)
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