ipv6: remove unnecessary dst_hold() in ip6_fragment()

In ipv6 tx path, rcu_read_lock() is taken so that dst won't get freed
during the execution of ip6_fragment(). Hence, no need to hold dst in
it.

Signed-off-by: Wei Wang <weiwan@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 8b8efb0..5baa6fa 100644 (file)
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -698,8 +698,6 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
                ipv6_hdr(skb)->payload_len = htons(first_len -
                                                   sizeof(struct ipv6hdr));
 
-               dst_hold(&rt->dst);
-
                for (;;) {
                        /* Prepare header of the next frame,
                         * before previous one went down. */
@@ -742,7 +740,6 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
                if (err == 0) {
                        IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
                                      IPSTATS_MIB_FRAGOKS);
-                       ip6_rt_put(rt);
                        return 0;
                }
 
@@ -750,7 +747,6 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 
                IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
                              IPSTATS_MIB_FRAGFAILS);
-               ip6_rt_put(rt);
                return err;
 
 slow_path_clean: