[TCP]: Add return value indication to tcp_prune_ofo_queue().

Returns non-zero if tp->out_of_order_queue was seen non-empty.
This allows tcp_try_rmem_schedule() to return early.

Signed-off-by: Vitaliy Gusev <vgusev@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 3 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 61db7b1eb995..bbb7d88a16b4 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3841,7 +3841,7 @@ static void tcp_ofo_queue(struct sock *sk)
         }
 }
 
-static void tcp_prune_ofo_queue(struct sock *sk);
+static int tcp_prune_ofo_queue(struct sock *sk);
 static int tcp_prune_queue(struct sock *sk);
 
 static inline int tcp_try_rmem_schedule(struct sock *sk, unsigned int size)
@@ -3853,7 +3853,9 @@ static inline int tcp_try_rmem_schedule(struct sock *sk, unsigned int size)
                         return -1;
 
                 if (!sk_rmem_schedule(sk, size)) {
-                        tcp_prune_ofo_queue(sk);
+                        if (!tcp_prune_ofo_queue(sk))
+                                return -1;
+
                         if (!sk_rmem_schedule(sk, size))
                                 return -1;
                 }
@@ -4211,10 +4213,12 @@ static void tcp_collapse_ofo_queue(struct sock *sk)
 
 /*
  * Purge the out-of-order queue.
+ * Return true if queue was pruned.
  */
-static void tcp_prune_ofo_queue(struct sock *sk)
+static int tcp_prune_ofo_queue(struct sock *sk)
 {
         struct tcp_sock *tp = tcp_sk(sk);
+        int res = 0;
 
         if (!skb_queue_empty(&tp->out_of_order_queue)) {
                 NET_INC_STATS_BH(LINUX_MIB_OFOPRUNED);
@@ -4228,7 +4232,9 @@ static void tcp_prune_ofo_queue(struct sock *sk)
                 if (tp->rx_opt.sack_ok)
                         tcp_sack_reset(&tp->rx_opt);
                 sk_mem_reclaim(sk);
+                res = 1;
         }
+        return res;
 }
 
 /* Reduce allocated memory if we can, trying to get