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    Subject[PATCH 4.9 094/104] tcp: fix under-evaluated ssthresh in TCP Vegas
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Hoang Tran <tranviethoang.vn@gmail.com>


    [ Upstream commit cf5d74b85ef40c202c76d90959db4d850f301b95 ]

    With the commit 76174004a0f19785 (tcp: do not slow start when cwnd equals
    ssthresh), the comparison to the reduced cwnd in tcp_vegas_ssthresh() would
    under-evaluate the ssthresh.

    Signed-off-by: Hoang Tran <hoang.tran@uclouvain.be>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/ipv4/tcp_vegas.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/net/ipv4/tcp_vegas.c
    +++ b/net/ipv4/tcp_vegas.c
    @@ -158,7 +158,7 @@ EXPORT_SYMBOL_GPL(tcp_vegas_cwnd_event);

    static inline u32 tcp_vegas_ssthresh(struct tcp_sock *tp)
    {
    - return min(tp->snd_ssthresh, tp->snd_cwnd-1);
    + return min(tp->snd_ssthresh, tp->snd_cwnd);
    }

    static void tcp_vegas_cong_avoid(struct sock *sk, u32 ack, u32 acked)

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