diff options
Diffstat (limited to 'net/core/netpoll.c')
| -rw-r--r-- | net/core/netpoll.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/net/core/netpoll.c b/net/core/netpoll.c index 19ff66079f76..e9ab4f0c454c 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -261,6 +261,7 @@ void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) unsigned long tries; struct net_device *dev = np->dev; const struct net_device_ops *ops = dev->netdev_ops; + /* It is up to the caller to keep npinfo alive. */ struct netpoll_info *npinfo = np->dev->npinfo; if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { @@ -810,10 +811,7 @@ int netpoll_setup(struct netpoll *np) refill_skbs(); /* last thing to do is link it to the net device structure */ - ndev->npinfo = npinfo; - - /* avoid racing with NAPI reading npinfo */ - synchronize_rcu(); + rcu_assign_pointer(ndev->npinfo, npinfo); return 0; @@ -857,6 +855,16 @@ void netpoll_cleanup(struct netpoll *np) if (atomic_dec_and_test(&npinfo->refcnt)) { const struct net_device_ops *ops; + + ops = np->dev->netdev_ops; + if (ops->ndo_netpoll_cleanup) + ops->ndo_netpoll_cleanup(np->dev); + + rcu_assign_pointer(np->dev->npinfo, NULL); + + /* avoid racing with NAPI reading npinfo */ + synchronize_rcu_bh(); + skb_queue_purge(&npinfo->arp_tx); skb_queue_purge(&npinfo->txq); cancel_rearming_delayed_work(&npinfo->tx_work); @@ -864,10 +872,6 @@ void netpoll_cleanup(struct netpoll *np) /* clean after last, unfinished work */ __skb_queue_purge(&npinfo->txq); kfree(npinfo); - ops = np->dev->netdev_ops; - if (ops->ndo_netpoll_cleanup) - ops->ndo_netpoll_cleanup(np->dev); - np->dev->npinfo = NULL; } } |