pppoe: RCU locking in get_item_by_addr()
Use dev_get_by_name_rcu() instead of dev_get_by_name(), to avoid touching device refcount in hotpath. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -250,20 +250,19 @@ static inline struct pppox_sock *get_item_by_addr(struct net *net,
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{
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struct net_device *dev;
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struct pppoe_net *pn;
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struct pppox_sock *pppox_sock;
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struct pppox_sock *pppox_sock = NULL;
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int ifindex;
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dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
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if (!dev)
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return NULL;
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rcu_read_lock();
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dev = dev_get_by_name_rcu(net, sp->sa_addr.pppoe.dev);
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if (dev) {
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ifindex = dev->ifindex;
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pn = net_generic(net, pppoe_net_id);
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pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid,
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sp->sa_addr.pppoe.remote, ifindex);
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dev_put(dev);
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}
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rcu_read_unlock();
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return pppox_sock;
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}
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