virtio_test: verify if virtqueue_kick() succeeded

Verify if a host kick succeeded by checking return value of virtqueue_kick().

Signed-off-by: Heinz Graalfs <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>

tools/virtio/virtio_test.c

@@ -172,7 +172,8 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
 							 GFP_ATOMIC);
 				if (likely(r == 0)) {
 					++started;
-					virtqueue_kick(vq->vq);
+					if (unlikely(!virtqueue_kick(vq->vq))
+						r = -1;
 				}
 			} else
 				r = -1;