[RFC PATCH 04/24] virtio-vdpa: don't set callback if virtio doesn't need it

[Jason Wang]

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

Signed-off-by: Jason Wang <jasow...@redhat.com>
---
 drivers/virtio/virtio_vdpa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index 4a9ddb44b2a7..af6ee677f319 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -175,7 +175,7 @@ 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));
-- 
2.20.1