diff options
| -rw-r--r-- | include/linux/netpoll.h | 1 | ||||
| -rw-r--r-- | net/core/netpoll.c | 25 |
2 files changed, 20 insertions, 6 deletions
diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h index 1efe60c5c00..39845fc975f 100644 --- a/include/linux/netpoll.h +++ b/include/linux/netpoll.h @@ -25,6 +25,7 @@ struct netpoll { }; struct netpoll_info { + atomic_t refcnt; spinlock_t poll_lock; int poll_owner; int tries; diff --git a/net/core/netpoll.c b/net/core/netpoll.c index 4de62f1f413..c66df2f45d2 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -658,8 +658,11 @@ int netpoll_setup(struct netpoll *np) npinfo->tries = MAX_RETRIES; spin_lock_init(&npinfo->rx_lock); skb_queue_head_init(&npinfo->arp_tx); - } else + atomic_set(&npinfo->refcnt, 1); + } else { npinfo = ndev->npinfo; + atomic_inc(&npinfo->refcnt); + } if (!ndev->poll_controller) { printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", @@ -766,12 +769,22 @@ void netpoll_cleanup(struct netpoll *np) if (np->dev) { npinfo = np->dev->npinfo; - if (npinfo && npinfo->rx_np == np) { - spin_lock_irqsave(&npinfo->rx_lock, flags); - npinfo->rx_np = NULL; - npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; - spin_unlock_irqrestore(&npinfo->rx_lock, flags); + if (npinfo) { + if (npinfo->rx_np == np) { + spin_lock_irqsave(&npinfo->rx_lock, flags); + npinfo->rx_np = NULL; + npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; + spin_unlock_irqrestore(&npinfo->rx_lock, flags); + } + + np->dev->npinfo = NULL; + if (atomic_dec_and_test(&npinfo->refcnt)) { + skb_queue_purge(&npinfo->arp_tx); + + kfree(npinfo); + } } + dev_put(np->dev); } |