sch_teql: fix lockdep splat
We need rcu_read_lock() protection before using dst_get_neighbour(), and we must cache its value (pass it to __teql_resolve()) teql_master_xmit() is called under rcu_read_lock_bh() protection, its not enough. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Родитель
15fc1f3617
Коммит
f7e57044ee
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@ -225,11 +225,11 @@ static int teql_qdisc_init(struct Qdisc *sch, struct nlattr *opt)
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static int
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__teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res, struct net_device *dev)
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__teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res,
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struct net_device *dev, struct netdev_queue *txq,
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struct neighbour *mn)
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{
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struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, 0);
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struct teql_sched_data *q = qdisc_priv(dev_queue->qdisc);
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struct neighbour *mn = dst_get_neighbour(skb_dst(skb));
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struct teql_sched_data *q = qdisc_priv(txq->qdisc);
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struct neighbour *n = q->ncache;
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if (mn->tbl == NULL)
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@ -262,17 +262,26 @@ __teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res, struct net_device *
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}
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static inline int teql_resolve(struct sk_buff *skb,
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struct sk_buff *skb_res, struct net_device *dev)
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struct sk_buff *skb_res,
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struct net_device *dev,
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struct netdev_queue *txq)
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{
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struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
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struct dst_entry *dst = skb_dst(skb);
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struct neighbour *mn;
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int res;
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if (txq->qdisc == &noop_qdisc)
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return -ENODEV;
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if (dev->header_ops == NULL ||
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skb_dst(skb) == NULL ||
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dst_get_neighbour(skb_dst(skb)) == NULL)
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if (!dev->header_ops || !dst)
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return 0;
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return __teql_resolve(skb, skb_res, dev);
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rcu_read_lock();
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mn = dst_get_neighbour(dst);
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res = mn ? __teql_resolve(skb, skb_res, dev, txq, mn) : 0;
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rcu_read_unlock();
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return res;
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}
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static netdev_tx_t teql_master_xmit(struct sk_buff *skb, struct net_device *dev)
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@ -307,7 +316,7 @@ restart:
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continue;
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}
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switch (teql_resolve(skb, skb_res, slave)) {
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switch (teql_resolve(skb, skb_res, slave, slave_txq)) {
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case 0:
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if (__netif_tx_trylock(slave_txq)) {
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unsigned int length = qdisc_pkt_len(skb);
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