1 files changed, 8 insertions, 27 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4cb5e6f408dc..827cd4b9e867 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -234,7 +234,7 @@ static int __tcp_grow_window(const struct sock *sk, struct tcp_sock *tp,
 {
         /* Optimize this! */
         int truesize = tcp_win_from_space(skb->truesize)/2;
-        int window = tcp_full_space(sk)/2;
+        int window = tcp_win_from_space(sysctl_tcp_rmem[2])/2;
 
         while (tp->rcv_ssthresh <= window) {
                 if (truesize <= skb->len)
@@ -327,37 +327,18 @@ static void tcp_init_buffer_space(struct sock *sk)
 static void tcp_clamp_window(struct sock *sk, struct tcp_sock *tp)
 {
         struct inet_connection_sock *icsk = inet_csk(sk);
-        struct sk_buff *skb;
-        unsigned int app_win = tp->rcv_nxt - tp->copied_seq;
-        int ofo_win = 0;
 
         icsk->icsk_ack.quick = 0;
 
-        skb_queue_walk(&tp->out_of_order_queue, skb) {
-                ofo_win += skb->len;
-        }
-
-        /* If overcommit is due to out of order segments,
-         * do not clamp window. Try to expand rcvbuf instead.
-         */
-        if (ofo_win) {
-                if (sk->sk_rcvbuf < sysctl_tcp_rmem[2] &&
-                    !(sk->sk_userlocks & SOCK_RCVBUF_LOCK) &&
-                    !tcp_memory_pressure &&
-                    atomic_read(&tcp_memory_allocated) < sysctl_tcp_mem[0])
-                        sk->sk_rcvbuf = min(atomic_read(&sk->sk_rmem_alloc),
-                                            sysctl_tcp_rmem[2]);
+        if (sk->sk_rcvbuf < sysctl_tcp_rmem[2] &&
+            !(sk->sk_userlocks & SOCK_RCVBUF_LOCK) &&
+            !tcp_memory_pressure &&
+            atomic_read(&tcp_memory_allocated) < sysctl_tcp_mem[0]) {
+                sk->sk_rcvbuf = min(atomic_read(&sk->sk_rmem_alloc),
+                                    sysctl_tcp_rmem[2]);
         }
-        if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) {
-                app_win += ofo_win;
-                if (atomic_read(&sk->sk_rmem_alloc) >= 2 * sk->sk_rcvbuf)
-                        app_win >>= 1;
-                if (app_win > icsk->icsk_ack.rcv_mss)
-                        app_win -= icsk->icsk_ack.rcv_mss;
-                app_win = max(app_win, 2U*tp->advmss);
-
+        if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
                 tp->rcv_ssthresh = min(tp->window_clamp, 2U*tp->advmss);
-        }
 }
 
 /* Receiver "autotuning" code.