ipmr: do not acquire mrt_lock while calling ip_mr_forward()
ip_mr_forward() uses standard RCU protection already. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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9094db4b80
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4eadb88244
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@ -1817,7 +1817,7 @@ static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt,
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}
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#endif
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/* Processing handlers for ipmr_forward */
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/* Processing handlers for ipmr_forward, under rcu_read_lock() */
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static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
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int in_vifi, struct sk_buff *skb, int vifi)
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@ -1839,9 +1839,7 @@ static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
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WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len);
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vif_dev->stats.tx_bytes += skb->len;
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vif_dev->stats.tx_packets++;
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rcu_read_lock();
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ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
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rcu_read_unlock();
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goto out_free;
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}
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@ -1936,6 +1934,7 @@ static int ipmr_find_vif(const struct mr_table *mrt, struct net_device *dev)
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}
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/* "local" means that we should preserve one skb (for local delivery) */
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/* Called uner rcu_read_lock() */
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static void ip_mr_forward(struct net *net, struct mr_table *mrt,
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struct net_device *dev, struct sk_buff *skb,
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struct mfc_cache *c, int local)
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@ -1992,12 +1991,10 @@ static void ip_mr_forward(struct net *net, struct mr_table *mrt,
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c->_c.mfc_un.res.last_assert +
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MFC_ASSERT_THRESH)) {
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c->_c.mfc_un.res.last_assert = jiffies;
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rcu_read_lock();
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ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
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if (mrt->mroute_do_wrvifwhole)
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ipmr_cache_report(mrt, skb, true_vifi,
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IGMPMSG_WRVIFWHOLE);
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rcu_read_unlock();
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}
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goto dont_forward;
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}
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@ -2169,9 +2166,7 @@ int ip_mr_input(struct sk_buff *skb)
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return -ENODEV;
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}
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read_lock(&mrt_lock);
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ip_mr_forward(net, mrt, dev, skb, cache, local);
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read_unlock(&mrt_lock);
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if (local)
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return ip_local_deliver(skb);
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