tree fb24e2b58579db31a1ac6def65da1daeb89813e4
parent 973ec449bb4f2b8c514bacbcb4d9506fc31c8ce3
author Eric Dumazet <edumazet@google.com> 1359882785 +0000
committer David S. Miller <davem@davemloft.net> 1359925225 -0500

tcp: frto should not set snd_cwnd to 0

Commit 9dc274151a548 (tcp: fix ABC in tcp_slow_start())
uncovered a bug in FRTO code :
tcp_process_frto() is setting snd_cwnd to 0 if the number
of in flight packets is 0.

As Neal pointed out, if no packet is in flight we lost our
chance to disambiguate whether a loss timeout was spurious.

We should assume it was a proper loss.

Reported-by: Pasi Kärkkäinen <pasik@iki.fi>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Cc: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>