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authorJason Wang <jasowang@redhat.com>2018-03-09 09:50:33 +0300
committerDavid S. Miller <davem@davemloft.net>2018-03-09 20:02:59 +0300
commit303fd71b37fb710b26f5ff5444029d62cfd627bd (patch)
tree293b96678dda7f617ccf9a8e167f4ac977f3a17c /drivers/vhost/net.c
parentab7e34b3431c5d29817c503ad4d3bf2732f92ad3 (diff)
downloadlinux-303fd71b37fb710b26f5ff5444029d62cfd627bd.tar.xz
vhost_net: keep private_data and rx_ring synced
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>
Diffstat (limited to 'drivers/vhost/net.c')
-rw-r--r--drivers/vhost/net.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 60f1080bffc7..efb93063fda1 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -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;