[PATCH v2 net-next] inet: do not set backlog if listen fails

[Yafang Shao]

We don't need to set the backlog if listen fails.
The sk_max_ack_backlog will be set in the caller inet_listen() and
dccp_listen_start() if inet_csk_listen_start() return without error.
So just remove this line to avoid this unnecessary operation.

Regarding sk_ack_backlog, we have to set it before a TCP/DCCP socket is
ready to accept new flows to avoid race, because dccp and tcp have lockless
listeners

Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
---
 net/ipv4/inet_connection_sock.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index dfd5009..cdd5c95 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -871,7 +871,6 @@ int inet_csk_listen_start(struct sock *sk, int backlog)
 
 	reqsk_queue_alloc(&icsk->icsk_accept_queue);
 
-	sk->sk_max_ack_backlog = backlog;
 	sk->sk_ack_backlog = 0;
 	inet_csk_delack_init(sk);
 
-- 
1.8.3.1