diff options
| author | Heinz Graalfs <graalfs@linux.vnet.ibm.com> | 2013-10-29 09:40:02 +1030 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2013-10-29 11:28:14 +1030 |
| commit | 67975901183799af8e93ec60e322f9e2a1940b9b (patch) | |
| tree | fbf1f6289c2e2d1a6d67ad336cb7c61dc623ca45 /drivers/net/virtio_net.c | |
| parent | 5b1bf7cb673ade0ab5c75f200dce911d9fb91c21 (diff) | |
virtio_net: verify if virtqueue_kick() succeeded
Verify if a host kick succeeded by checking return value of virtqueue_kick().
Signed-off-by: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/net/virtio_net.c')
| -rw-r--r-- | drivers/net/virtio_net.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index ee022714eadb..ff208d2787d3 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -545,7 +545,8 @@ static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp) } while (rq->vq->num_free); if (unlikely(rq->num > rq->max)) rq->max = rq->num; - virtqueue_kick(rq->vq); + if (unlikely(!virtqueue_kick(rq->vq))) + return false; return !oom; } @@ -751,7 +752,7 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) err = xmit_skb(sq, skb); /* This should not happen! */ - if (unlikely(err)) { + if (unlikely(err) || unlikely(!virtqueue_kick(sq->vq))) { dev->stats.tx_fifo_errors++; if (net_ratelimit()) dev_warn(&dev->dev, @@ -760,7 +761,6 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) kfree_skb(skb); return NETDEV_TX_OK; } - virtqueue_kick(sq->vq); /* Don't wait up for transmitted skbs to be freed. */ skb_orphan(skb); @@ -819,7 +819,8 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, BUG_ON(virtqueue_add_sgs(vi->cvq, sgs, out_num, in_num, vi, GFP_ATOMIC) < 0); - virtqueue_kick(vi->cvq); + if (unlikely(!virtqueue_kick(vi->cvq))) + return status == VIRTIO_NET_OK; /* Spin for a response, the kick causes an ioport write, trapping * into the hypervisor, so the request should be handled immediately. |