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gre: remove unnecessary rcu_read_lock/unlock

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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>
This commit is contained in:
stephen hemminger
2012-09-24 18:12:24 +00:00
committed by David S. Miller
parent d208328765
commit 0c5794a66c
2 changed files with 10 additions and 25 deletions
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14
net/ipv6/ip6_gre.c
View File

@@ -437,14 +437,12 @@ static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
ipv6h = (const struct ipv6hdr *)skb->data;
p = (__be16 *)(skb->data + offset);
rcu_read_lock();
t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
flags & GRE_KEY ?
*(((__be32 *)p) + (grehlen / 4) - 1) : 0,
p[1]);
if (t == NULL)
goto out;
return;
switch (type) {
__u32 teli;
@@ -489,8 +487,6 @@ static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
else
t->err_count = 1;
t->err_time = jiffies;
out:
rcu_read_unlock();
}
static inline void ip6gre_ecn_decapsulate_ipv4(const struct ip6_tnl *t,
@@ -528,7 +524,7 @@ static int ip6gre_rcv(struct sk_buff *skb)
__be16 gre_proto;
if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
goto drop_nolock;
goto drop;
ipv6h = ipv6_hdr(skb);
h = skb->data;
@@ -539,7 +535,7 @@ static int ip6gre_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) {
@@ -567,7 +563,6 @@ static int ip6gre_rcv(struct sk_buff *skb)
gre_proto = *(__be16 *)(h + 2);
rcu_read_lock();
tunnel = ip6gre_tunnel_lookup(skb->dev,
&ipv6h->saddr, &ipv6h->daddr, key,
gre_proto);
@@ -646,14 +641,11 @@ static int ip6gre_rcv(struct sk_buff *skb)
netif_rx(skb);
rcu_read_unlock();
return 0;
}
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
drop:
rcu_read_unlock();
drop_nolock:
kfree_skb(skb);
return 0;
}