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| author | stephen hemminger <shemminger@vyatta.com> | 2012-09-24 18:12:24 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-09-27 18:12:37 -0400 |
| commit | 0c5794a66c7c6443759e6098841767958a031187 (patch) | |
| tree | bc5206b2ce2fa58fc47f6d94fabc7c1bb9fa6f78 /net/ipv4/ip_gre.c | |
| parent | d208328765a0ab425e36b5b828285f3337a85451 (diff) | |
| download | linux-0c5794a66c7c6443759e6098841767958a031187.tar.gz linux-0c5794a66c7c6443759e6098841767958a031187.tar.bz2 linux-0c5794a66c7c6443759e6098841767958a031187.zip | |
gre: remove unnecessary rcu_read_lock/unlock
The gre function pointers for receive and error handling are
always called (from gre.c) with rcu_read_lock already held.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_gre.c')
| -rw-r--r-- | net/ipv4/ip_gre.c | 21 |
1 files changed, 7 insertions, 14 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 0d4c3832d490..1c012cb2cb94 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -557,37 +557,34 @@ static void ipgre_err(struct sk_buff *skb, u32 info) break; } - rcu_read_lock(); t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr, flags, key, p[1]); if (t == NULL) - goto out; + return; if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { ipv4_update_pmtu(skb, dev_net(skb->dev), info, t->parms.link, 0, IPPROTO_GRE, 0); - goto out; + return; } if (type == ICMP_REDIRECT) { ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0, IPPROTO_GRE, 0); - goto out; + return; } if (t->parms.iph.daddr == 0 || ipv4_is_multicast(t->parms.iph.daddr)) - goto out; + return; if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) - goto out; + return; if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) t->err_count++; else t->err_count = 1; t->err_time = jiffies; -out: - rcu_read_unlock(); } static inline void ipgre_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) @@ -625,7 +622,7 @@ static int ipgre_rcv(struct sk_buff *skb) __be16 gre_proto; if (!pskb_may_pull(skb, 16)) - goto drop_nolock; + goto drop; iph = ip_hdr(skb); h = skb->data; @@ -636,7 +633,7 @@ static int ipgre_rcv(struct sk_buff *skb) - We do not support routing headers. */ if (flags&(GRE_VERSION|GRE_ROUTING)) - goto drop_nolock; + goto drop; if (flags&GRE_CSUM) { switch (skb->ip_summed) { @@ -664,7 +661,6 @@ static int ipgre_rcv(struct sk_buff *skb) gre_proto = *(__be16 *)(h + 2); - rcu_read_lock(); tunnel = ipgre_tunnel_lookup(skb->dev, iph->saddr, iph->daddr, flags, key, gre_proto); @@ -740,14 +736,11 @@ static int ipgre_rcv(struct sk_buff *skb) netif_rx(skb); - rcu_read_unlock(); return 0; } icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); drop: - rcu_read_unlock(); -drop_nolock: kfree_skb(skb); return 0; } |