vhost: init used ring after backend was set
Move the used ring initialization after backend was set. This
makes it possible to disable the backend and tweak the used ring,
then restart. This will also make it possible to log the used ring
write correctly.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
index 734e1d7..fc9a1d7 100644
--- a/drivers/vhost/test.c
+++ b/drivers/vhost/test.c
@@ -195,8 +195,13 @@
lockdep_is_held(&vq->mutex));
rcu_assign_pointer(vq->private_data, priv);
+ r = vhost_init_used(&n->vqs[index]);
+
mutex_unlock(&vq->mutex);
+ if (r)
+ goto err;
+
if (oldpriv) {
vhost_test_flush_vq(n, index);
}