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vhost_net: keep private_data and rx_ring synced

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We get pointer ring from the exported sock, this means we should keep
rx_ring and vq->private synced during both vq stop and backend set,
otherwise we may see stale rx_ring.

Fixes: c67df11f6e480 ("vhost_net: try batch dequing from skb array")
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2018-03-09 14:50:33 +08:00 committed by David S. Miller
parent ab7e34b343
commit 303fd71b37
1 changed files with 3 additions and 2 deletions
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5
drivers/vhost/net.c
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@ -973,6 +973,7 @@ static struct socket *vhost_net_stop_vq(struct vhost_net *n,
vhost_net_disable_vq(n, vq);
vq->private_data = NULL;
vhost_net_buf_unproduce(nvq);
nvq->rx_ring = NULL;
mutex_unlock(&vq->mutex);
return sock;
}
@ -1162,14 +1163,14 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
vhost_net_disable_vq(n, vq);
vq->private_data = sock;
vhost_net_buf_unproduce(nvq);
if (index == VHOST_NET_VQ_RX)
nvq->rx_ring = get_tap_ptr_ring(fd);
r = vhost_vq_init_access(vq);
if (r)
goto err_used;
r = vhost_net_enable_vq(n, vq);
if (r)
goto err_used;
if (index == VHOST_NET_VQ_RX)
nvq->rx_ring = get_tap_ptr_ring(fd);
oldubufs = nvq->ubufs;
nvq->ubufs = ubufs;