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authorEric Dumazet <edumazet@google.com>2015-07-09 00:28:29 +0300
committerDavid S. Miller <davem@davemloft.net>2015-07-10 01:12:20 +0300
commitfc01538f9fb75572c969ca9988176ffc2a8741d6 (patch)
tree51125f77aaa93b73953f7d3189c1e2a13a904490 /net/ipv6/inet6_hashtables.c
parent3fd2f1b9d91284afb957ab9899a83279d0e09f29 (diff)
downloadlinux-fc01538f9fb75572c969ca9988176ffc2a8741d6.tar.xz
inet: simplify timewait refcounting
timewait sockets have a complex refcounting logic. Once we realize it should be similar to established and syn_recv sockets, we can use sk_nulls_del_node_init_rcu() and remove inet_twsk_unhash() In particular, deferred inet_twsk_put() added in commit 13475a30b66cd ("tcp: connect() race with timewait reuse") looks unecessary : When removing a timewait socket from ehash or bhash, caller must own a reference on the socket anyway. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/inet6_hashtables.c')
-rw-r--r--net/ipv6/inet6_hashtables.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index b4fd96de97e6..a237398aa2b4 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -207,7 +207,6 @@ static int __inet6_check_established(struct inet_timewait_death_row *death_row,
struct sock *sk2;
const struct hlist_nulls_node *node;
struct inet_timewait_sock *tw = NULL;
- int twrefcnt = 0;
spin_lock(lock);
@@ -234,12 +233,10 @@ static int __inet6_check_established(struct inet_timewait_death_row *death_row,
WARN_ON(!sk_unhashed(sk));
__sk_nulls_add_node_rcu(sk, &head->chain);
if (tw) {
- twrefcnt = inet_twsk_unhash(tw);
+ sk_nulls_del_node_init_rcu((struct sock *)tw);
NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED);
}
spin_unlock(lock);
- if (twrefcnt)
- inet_twsk_put(tw);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
if (twp) {
@@ -247,7 +244,6 @@ static int __inet6_check_established(struct inet_timewait_death_row *death_row,
} else if (tw) {
/* Silly. Should hash-dance instead... */
inet_twsk_deschedule(tw);
-
inet_twsk_put(tw);
}
return 0;