ipv6: remove unnecessary codes in tcp_ipv6.c

opt always equals np->opts, so it is meaningless to define opt, and
check if opt does not equal np->opts and then try to free opt.

Signed-off-by: RongQing.Li <roy.qing.li@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 9c06eaf..6cc67ed 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -486,7 +486,6 @@ static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst,
        struct inet6_request_sock *treq = inet6_rsk(req);
        struct ipv6_pinfo *np = inet6_sk(sk);
        struct sk_buff * skb;
-       struct ipv6_txoptions *opt = np->opt;
        int err = -ENOMEM;
 
        /* First, grab a route. */
@@ -500,13 +499,11 @@ static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst,
 
                fl6->daddr = treq->rmt_addr;
                skb_set_queue_mapping(skb, queue_mapping);
-               err = ip6_xmit(sk, skb, fl6, opt, np->tclass);
+               err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
                err = net_xmit_eval(err);
        }
 
 done:
-       if (opt && opt != np->opt)
-               sock_kfree_s(sk, opt, opt->tot_len);
        return err;
 }
 
@@ -1229,7 +1226,6 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
        struct inet_sock *newinet;
        struct tcp_sock *newtp;
        struct sock *newsk;
-       struct ipv6_txoptions *opt;
 #ifdef CONFIG_TCP_MD5SIG
        struct tcp_md5sig_key *key;
 #endif
@@ -1290,7 +1286,6 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
        }
 
        treq = inet6_rsk(req);
-       opt = np->opt;
 
        if (sk_acceptq_is_full(sk))
                goto out_overflow;
@@ -1359,11 +1354,8 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
           but we make one more one thing there: reattach optmem
           to newsk.
         */
-       if (opt) {
-               newnp->opt = ipv6_dup_options(newsk, opt);
-               if (opt != np->opt)
-                       sock_kfree_s(sk, opt, opt->tot_len);
-       }
+       if (np->opt)
+               newnp->opt = ipv6_dup_options(newsk, np->opt);
 
        inet_csk(newsk)->icsk_ext_hdr_len = 0;
        if (newnp->opt)
@@ -1410,8 +1402,6 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 out_overflow:
        NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
 out_nonewsk:
-       if (opt && opt != np->opt)
-               sock_kfree_s(sk, opt, opt->tot_len);
        dst_release(dst);
 out:
        NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);