From: Eric Dumazet <eric.duma...@gmail.com>
Date: Mon, 16 Oct 2017 19:38:35 -0700
> From: Eric Dumazet <eduma...@google.com>
>
> I tried to hard avoiding a call to rb_first() (via tcp_rtx_queue_head)
> in tcp_xmit_retransmit_queue(). But this was probably too bold.
>
> Quoting Yuchung :
>
> We might miss re-arming the RTO if tp->retransmit_skb_hint is not NULL.
> This can happen when RACK marks the first packet lost again and resets
> tp->retransmit_skb_hint for example (tcp_rack_mark_skb_lost())
>
> Fixes: 75c119afe14f ("tcp: implement rb-tree based retransmit queue")
> Signed-off-by: Eric Dumazet <eduma...@google.com>
> Reported-by: Yuchung Cheng <ych...@google.com>
Applied.
