tcp: consistently check retransmit hint
tcp_simple_retransmit() used for path MTU discovery may not adjust the retransmit hint properly by deducting retrans_out before checking it to adjust the hint. This patch fixes this by a correct routine tcp_mark_skb_lost() already used by the RACK loss detection. Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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