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tcp: Fix tcp_mark_head_lost() with packets == 0 

A packet is marked as lost in case packets == 0, although nothing should be done.
This results in a too early retransmitted packet during recovery in some cases.
This small patch fixes this issue by returning immediately.

Signed-off-by: Lennart Schulte <lennart.schulte@nets.rwth-aachen.de>
Signed-off-by: Arnd Hannemann <hannemann@nets.rwth-aachen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lennart Schulte 2010-03-17 02:16:29 +00:00 committed by David S. Miller
parent a50436f2cd
commit 6830c25b7d
1 changed files with 3 additions and 0 deletions
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3
net/ipv4/tcp_input.c
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@ -2511,6 +2511,9 @@ static void tcp_mark_head_lost(struct sock *sk, int packets)
int err;
unsigned int mss;
if (packets == 0)
return;
WARN_ON(packets > tp->packets_out);
if (tp->lost_skb_hint) {
skb = tp->lost_skb_hint;