Commit:     7f9c33e515353ea91afc62341161fead19e78567
Parent:     91cc17c0e5e5ada156a8d5787a2509d263ea6bbf
Author:     Ilpo Järvinen <[EMAIL PROTECTED]>
AuthorDate: Fri Nov 23 19:10:56 2007 +0800
Committer:  Herbert Xu <[EMAIL PROTECTED]>
CommitDate: Fri Nov 23 19:10:56 2007 +0800

    [TCP] MTUprobe: Cleanup send queue check (no need to loop)
    The original code has striking complexity to perform a query
    which can be reduced to a very simple compare.
    FIN seqno may be included to write_seq but it should not make
    any significant difference here compared to skb->len which was
    used previously. One won't end up there with SYN still queued.
    Use of write_seq check guarantees that there's a valid skb in
    send_head so I removed the extra check.
    Signed-off-by: Ilpo Järvinen <[EMAIL PROTECTED]>
    Acked-by: John Heffner <[EMAIL PROTECTED]>
    Signed-off-by: Herbert Xu <[EMAIL PROTECTED]>
 net/ipv4/tcp_output.c |    7 +------
 1 files changed, 1 insertions(+), 6 deletions(-)

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 4f8a8a1..e5130a7 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1321,12 +1321,7 @@ static int tcp_mtu_probe(struct sock *sk)
        /* Have enough data in the send queue to probe? */
-       len = 0;
-       if ((skb = tcp_send_head(sk)) == NULL)
-               return -1;
-       while ((len += skb->len) < size_needed && !tcp_skb_is_last(sk, skb))
-               skb = tcp_write_queue_next(sk, skb);
-       if (len < size_needed)
+       if (tp->write_seq - tp->snd_nxt < size_needed)
                return -1;
        if (tp->snd_wnd < size_needed)
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