[NET]: Revert incorrect accept queue backlog changes.

This reverts two changes:

8488df894d05d6fa41c2bd298c335f944bb0e401
248f06726e866942b3d8ca8f411f9067713b7ff8

A backlog value of N really does mean allow "N + 1" connections
to queue to a listening socket.  This allows one to specify
"0" as the backlog and still get 1 connection.

Noticed by Gerrit Renker and Rick Jones.

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 4 insertions, 4 deletions

diff --git a/include/net/sock.h b/include/net/sock.h
index 849c7df23181..2c7d60ca3548 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 51ca4383c388..606971645b33 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;