diff options
| -rw-r--r-- | drivers/net/tun.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index ffdb84474c47..2917a86f4c43 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -298,11 +298,12 @@ static void tun_flow_cleanup(unsigned long data) } static void tun_flow_update(struct tun_struct *tun, u32 rxhash, - u16 queue_index) + struct tun_file *tfile) { struct hlist_head *head; struct tun_flow_entry *e; unsigned long delay = tun->ageing_time; + u16 queue_index = tfile->queue_index; if (!rxhash) return; @@ -311,7 +312,9 @@ static void tun_flow_update(struct tun_struct *tun, u32 rxhash, rcu_read_lock(); - if (tun->numqueues == 1) + /* We may get a very small possibility of OOO during switching, not + * worth to optimize.*/ + if (tun->numqueues == 1 || tfile->detached) goto unlock; e = tun_flow_find(head, rxhash); @@ -411,21 +414,21 @@ static void __tun_detach(struct tun_file *tfile, bool clean) tun = rtnl_dereference(tfile->tun); - if (tun) { + if (tun && !tfile->detached) { u16 index = tfile->queue_index; BUG_ON(index >= tun->numqueues); dev = tun->dev; rcu_assign_pointer(tun->tfiles[index], tun->tfiles[tun->numqueues - 1]); - rcu_assign_pointer(tfile->tun, NULL); ntfile = rtnl_dereference(tun->tfiles[index]); ntfile->queue_index = index; --tun->numqueues; - if (clean) + if (clean) { + rcu_assign_pointer(tfile->tun, NULL); sock_put(&tfile->sk); - else + } else tun_disable_queue(tun, tfile); synchronize_net(); @@ -473,6 +476,10 @@ static void tun_detach_all(struct net_device *dev) rcu_assign_pointer(tfile->tun, NULL); --tun->numqueues; } + list_for_each_entry(tfile, &tun->disabled, next) { + wake_up_all(&tfile->wq.wait); + rcu_assign_pointer(tfile->tun, NULL); + } BUG_ON(tun->numqueues != 0); synchronize_net(); @@ -503,7 +510,7 @@ static int tun_attach(struct tun_struct *tun, struct file *file) goto out; err = -EINVAL; - if (rtnl_dereference(tfile->tun)) + if (rtnl_dereference(tfile->tun) && !tfile->detached) goto out; err = -EBUSY; @@ -1202,7 +1209,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, tun->dev->stats.rx_packets++; tun->dev->stats.rx_bytes += len; - tun_flow_update(tun, rxhash, tfile->queue_index); + tun_flow_update(tun, rxhash, tfile); return total_len; } @@ -1816,7 +1823,7 @@ static int tun_set_queue(struct file *file, struct ifreq *ifr) ret = tun_attach(tun, file); } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { tun = rtnl_dereference(tfile->tun); - if (!tun || !(tun->flags & TUN_TAP_MQ)) + if (!tun || !(tun->flags & TUN_TAP_MQ) || tfile->detached) ret = -EINVAL; else __tun_detach(tfile, false); |