tcp: fixing TLP's FIN recovery
Fix to a problem observed when losing a FIN segment that does not contain data. In such situations, TLP is unable to recover from *any* tail loss and instead adds at least PTO ms to the retransmission process, i.e., RTO = RTO + PTO. Signed-off-by: NPer Hurtig <per.hurtig@kau.se> Signed-off-by: NEric Dumazet <edumazet@google.com> Acked-by: NNandita Dukkipati <nanditad@google.com> Acked-by: NNeal Cardwell <ncardwell@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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