From: Eric Dumazet <edumazet@google.com>
Date: Fri, 18 Oct 2013 21:43:55 +0000 (-0700)
Subject: ipv6: gso: remove redundant locking
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=b917eb155c56bbb766140b406979820e719e3f55;p=openwrt%2Fstaging%2Fblogic.git

ipv6: gso: remove redundant locking

ipv6_gso_send_check() and ipv6_gso_segment() are called by
skb_mac_gso_segment() under rcu lock, no need to use
rcu_read_lock() / rcu_read_unlock()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index d82de7228100..b405fba91c72 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -66,7 +66,6 @@ static int ipv6_gso_send_check(struct sk_buff *skb)
 	__skb_pull(skb, sizeof(*ipv6h));
 	err = -EPROTONOSUPPORT;
 
-	rcu_read_lock();
 	ops = rcu_dereference(inet6_offloads[
 		ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
 
@@ -74,7 +73,6 @@ static int ipv6_gso_send_check(struct sk_buff *skb)
 		skb_reset_transport_header(skb);
 		err = ops->callbacks.gso_send_check(skb);
 	}
-	rcu_read_unlock();
 
 out:
 	return err;
@@ -113,13 +111,12 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
 	segs = ERR_PTR(-EPROTONOSUPPORT);
 
 	proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
-	rcu_read_lock();
+
 	ops = rcu_dereference(inet6_offloads[proto]);
 	if (likely(ops && ops->callbacks.gso_segment)) {
 		skb_reset_transport_header(skb);
 		segs = ops->callbacks.gso_segment(skb, features);
 	}
-	rcu_read_unlock();
 
 	if (IS_ERR(segs))
 		goto out;