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>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index f0fd52cdfadc..70ac60437d17 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -703,6 +703,10 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
                 vhost_net_disable_vq(n, vq);
                 rcu_assign_pointer(vq->private_data, sock);
                 vhost_net_enable_vq(n, vq);
+
+                r = vhost_init_used(vq);
+                if (r)
+                        goto err_vq;
         }
 
         mutex_unlock(&vq->mutex);