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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 | |
| parent | 8bbb181308bc348e02bfdbebdedd4e4ec9d452ce (diff) | |
| download | linux-stable-cca32e4bf999a34ac08d959f351f2b30bcd02460.tar.gz linux-stable-cca32e4bf999a34ac08d959f351f2b30bcd02460.tar.bz2 linux-stable-cca32e4bf999a34ac08d959f351f2b30bcd02460.zip | |
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>
| -rw-r--r-- | net/ipv4/ip_input.c | 2 | ||||
| -rw-r--r-- | net/ipv6/ip6_input.c | 2 |
2 files changed, 0 insertions, 4 deletions
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index 981ff1eef28c..f1395a6fb35f 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -325,14 +325,12 @@ static int ip_rcv_finish(struct sk_buff *skb) const struct net_protocol *ipprot; int protocol = iph->protocol; - rcu_read_lock(); ipprot = rcu_dereference(inet_protos[protocol]); if (ipprot && ipprot->early_demux) { ipprot->early_demux(skb); /* must reload iph, skb->head might have changed */ iph = ip_hdr(skb); } - rcu_read_unlock(); } /* 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); |