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| author | Eric Dumazet <edumazet@google.com> | 2012-07-29 21:06:13 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-07-30 14:53:21 -0700 |
| commit | cca32e4bf999a34ac08d959f351f2b30bcd02460 (patch) | |
| tree | 7456e3d00b57ab353bb726219cec83b8b4d101ab /net/ipv6/ip6_input.c | |
| parent | 8bbb181308bc348e02bfdbebdedd4e4ec9d452ce (diff) | |
| download | linux-cca32e4bf999a34ac08d959f351f2b30bcd02460.tar.gz | |
net: TCP early demux cleanup
early_demux() handlers should be called in RCU context, and as we use skb_dst_set_noref(skb, dst), caller must not exit from RCU context before dst use (skb_dst(skb)) or release (skb_drop(dst)) Therefore, rcu_read_lock()/rcu_read_unlock() pairs around ->early_demux() are confusing and not needed : Protocol handlers are already in an RCU read lock section. (__netif_receive_skb() does the rcu_read_lock() ) Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6_input.c')
| -rw-r--r-- | net/ipv6/ip6_input.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c index 47975e363fcd..a52d864d562b 100644 --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -52,11 +52,9 @@ int ip6_rcv_finish(struct sk_buff *skb) if (sysctl_ip_early_demux && !skb_dst(skb)) { const struct inet6_protocol *ipprot; - rcu_read_lock(); ipprot = rcu_dereference(inet6_protos[ipv6_hdr(skb)->nexthdr]); if (ipprot && ipprot->early_demux) ipprot->early_demux(skb); - rcu_read_unlock(); } if (!skb_dst(skb)) ip6_route_input(skb); |