drm/vmwgfx: Remove call to reservation_object_test_signaled_rcu before wait

Since fence_wait_timeout_reservation_object_wait_timeout_rcu() with a
timeout of 0 becomes reservation_object_test_signaled_rcu(), we do not
need to handle such conversion in the caller. The only challenge are
those callers that wish to differentiate the error code between the
nonblocking busy check and potentially blocking wait.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Sinclair Yeh <syeh@vmware.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20160829070834.22296-5-chris@chris-wilson.co.uk

drivers/gpu/drm/vmwgfx/vmwgfx_resource.c

@@ -574,10 +574,8 @@ static int vmw_user_dmabuf_synccpu_grab(struct vmw_user_dma_buffer *user_bo,
 		bool nonblock = !!(flags & drm_vmw_synccpu_dontblock);
 		long lret;
 
-		if (nonblock)
-			return reservation_object_test_signaled_rcu(bo->resv, true) ? 0 : -EBUSY;
-
-		lret = reservation_object_wait_timeout_rcu(bo->resv, true, true, MAX_SCHEDULE_TIMEOUT);
+		lret = reservation_object_wait_timeout_rcu(bo->resv, true, true,
+							   nonblock ? 0 : MAX_SCHEDULE_TIMEOUT);
 		if (!lret)
 			return -EBUSY;
 		else if (lret < 0)