mptcp_retransmit_timer
struct timer_list mptcp_retransmit_timer;
struct sock *sk = timer_container_of(sk, t, mptcp_retransmit_timer);
timer_setup(&sk->mptcp_retransmit_timer, mptcp_retransmit_timer, 0);
sk_stop_timer(sk, &sk->mptcp_retransmit_timer);
return timer_pending(&sk->mptcp_retransmit_timer);
sk_reset_timer(sk, &sk->mptcp_retransmit_timer, jiffies + tout);