Bring radeon up to speed with the async event synchronization for
drmWaitVblank. See c9a9c5e0 for
more information. Without this patch event never get delivered
to userspace client.
Signed-off-by: NJerome Glisse <jglisse@redhat.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>