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| author | Doug Ledford <dledford@redhat.com> | 2018-01-08 16:06:20 -0500 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2018-01-08 16:06:20 -0500 |
| commit | f8457d5832d882d8a74fe41a6ce70313a31b3e0e (patch) | |
| tree | c5d080c599c0f2aa8bd2ce522698242a540e6b88 /drivers/infiniband/ulp/ipoib/ipoib_main.c | |
| parent | c4b76d8d95600d143f4d75f1bd700eb5d378099f (diff) | |
| parent | 2d67017cc78f1607bac5347ce0c5258734796faf (diff) | |
| download | lwn-f8457d5832d882d8a74fe41a6ce70313a31b3e0e.tar.gz lwn-f8457d5832d882d8a74fe41a6ce70313a31b3e0e.zip | |
Merge branch 'bart-srpt-for-next' into k.o/wip/dl-for-next
Merging in 12 patch series from Bart that required changes in the
current for-rc branch in order to apply cleanly.
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/ulp/ipoib/ipoib_main.c')
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_main.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index cb79be1a1474..5930c7d9a8fb 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -926,8 +926,8 @@ static int path_rec_start(struct net_device *dev, return 0; } -static void neigh_add_path(struct sk_buff *skb, u8 *daddr, - struct net_device *dev) +static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr, + struct net_device *dev) { struct ipoib_dev_priv *priv = ipoib_priv(dev); struct rdma_netdev *rn = netdev_priv(dev); @@ -941,7 +941,15 @@ static void neigh_add_path(struct sk_buff *skb, u8 *daddr, spin_unlock_irqrestore(&priv->lock, flags); ++dev->stats.tx_dropped; dev_kfree_skb_any(skb); - return; + return NULL; + } + + /* To avoid race condition, make sure that the + * neigh will be added only once. + */ + if (unlikely(!list_empty(&neigh->list))) { + spin_unlock_irqrestore(&priv->lock, flags); + return neigh; } path = __path_find(dev, daddr + 4); @@ -980,7 +988,7 @@ static void neigh_add_path(struct sk_buff *skb, u8 *daddr, path->ah->last_send = rn->send(dev, skb, path->ah->ah, IPOIB_QPN(daddr)); ipoib_neigh_put(neigh); - return; + return NULL; } } else { neigh->ah = NULL; @@ -997,7 +1005,7 @@ static void neigh_add_path(struct sk_buff *skb, u8 *daddr, spin_unlock_irqrestore(&priv->lock, flags); ipoib_neigh_put(neigh); - return; + return NULL; err_path: ipoib_neigh_free(neigh); @@ -1007,6 +1015,8 @@ err_drop: spin_unlock_irqrestore(&priv->lock, flags); ipoib_neigh_put(neigh); + + return NULL; } static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev, @@ -1127,8 +1137,9 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) case htons(ETH_P_TIPC): neigh = ipoib_neigh_get(dev, phdr->hwaddr); if (unlikely(!neigh)) { - neigh_add_path(skb, phdr->hwaddr, dev); - return NETDEV_TX_OK; + neigh = neigh_add_path(skb, phdr->hwaddr, dev); + if (likely(!neigh)) + return NETDEV_TX_OK; } break; case htons(ETH_P_ARP): |