Wei, I have to revert your change, it is incorrect as pointed
out by other people here on netdev.
BSD sockets basically define the 'backlog' parameter to listen()
to mean "allow backlog + 1" connections to be queued to the socket.
This allows a backlog parameter of "0" to allow 1 connection, and
there are real applications which do this.
diff --git a/include/net/sock.h b/include/net/sock.h
index 849c7df..2c7d60c 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -426,7 +426,7 @@ static inline void sk_acceptq_added(struct sock *sk)
static inline int sk_acceptq_is_full(struct sock *sk)
{
- return sk->sk_ack_backlog >= sk->sk_max_ack_backlog;
+ return sk->sk_ack_backlog > sk->sk_max_ack_backlog;
}
/*
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 51ca438..6069716 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -934,7 +934,7 @@ static long unix_wait_for_peer(struct sock *other, long
timeo)
sched = !sock_flag(other, SOCK_DEAD) &&
!(other->sk_shutdown & RCV_SHUTDOWN) &&
- (skb_queue_len(&other->sk_receive_queue) >=
+ (skb_queue_len(&other->sk_receive_queue) >
other->sk_max_ack_backlog);
unix_state_runlock(other);
@@ -1008,7 +1008,7 @@ restart:
if (other->sk_state != TCP_LISTEN)
goto out_unlock;
- if (skb_queue_len(&other->sk_receive_queue) >=
+ if (skb_queue_len(&other->sk_receive_queue) >
other->sk_max_ack_backlog) {
err = -EAGAIN;
if (!timeo)
@@ -1381,7 +1381,7 @@ restart:
}
if (unix_peer(other) != sk &&
- (skb_queue_len(&other->sk_receive_queue) >=
+ (skb_queue_len(&other->sk_receive_queue) >
other->sk_max_ack_backlog)) {
if (!timeo) {
err = -EAGAIN;
-
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