Commit:     48611c47d09023d9356e78550d1cadb8d61da9c8
Parent:     3eb215de26e6e94bf5fed9cb77230c383b30e53b
Author:     Ilpo Järvinen <[EMAIL PROTECTED]>
AuthorDate: Sun Oct 7 23:43:10 2007 -0700
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Sun Oct 7 23:43:10 2007 -0700

    [TCP]: Fix fastpath_cnt_hint when GSO skb is partially ACKed
    When only GSO skb was partially ACKed, no hints are reset,
    therefore fastpath_cnt_hint must be tweaked too or else it can
    corrupt fackets_out. The corruption to occur, one must have
    non-trivial ACK/SACK sequence, so this bug is not very often
    that harmful. There's a fackets_out state reset in TCP because
    fackets_out is known to be inaccurate and that fixes the issue
    eventually anyway.
    In case there was also at least one skb that got fully ACKed,
    the fastpath_skb_hint is set to NULL which causes a recount for
    fastpath_cnt_hint (the old value won't be accessed anymore),
    thus it can safely be decremented without additional checking.
    Reported by Cedric Le Goater <[EMAIL PROTECTED]>
    Signed-off-by: Ilpo Järvinen <[EMAIL PROTECTED]>
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
 net/ipv4/tcp_input.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index bbad2cd..f893e90 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2420,6 +2420,9 @@ static int tcp_tso_acked(struct sock *sk, struct sk_buff 
                        __u32 dval = min(tp->fackets_out, packets_acked);
                        tp->fackets_out -= dval;
+               /* hint's skb might be NULL but we don't need to care */
+               tp->fastpath_cnt_hint -= min_t(u32, packets_acked,
+                                              tp->fastpath_cnt_hint);
                tp->packets_out -= packets_acked;
                BUG_ON(tcp_skb_pcount(skb) == 0);
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