virtio-vdpa: don't set callback if virtio doesn't need it

There's no need for setting callbacks for the driver that doesn't care
about that.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Gautam Dawar <gdawar@xilinx.com>
Message-Id: <20220330180436.24644-3-gdawar@xilinx.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index 7650455..46c7165 100644 (file)
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -184,7 +184,7 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
        }
 
        /* Setup virtqueue callback */
-       cb.callback = virtio_vdpa_virtqueue_cb;
+       cb.callback = callback ? virtio_vdpa_virtqueue_cb : NULL;
        cb.private = info;
        ops->set_vq_cb(vdpa, index, &cb);
        ops->set_vq_num(vdpa, index, virtqueue_get_vring_size(vq));