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| author | Eric Dumazet <edumazet@google.com> | 2019-12-03 08:05:52 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-12-03 11:52:38 -0800 |
| commit | 0d580fbd2db084a5c96ee9c00492236a279d5e0f (patch) | |
| tree | 5cc51447d1d51d8b87151c5706cf819314b7c410 | |
| parent | 9385973fe8db9743fa93bf17245635be4eb8c4a6 (diff) | |
| download | linux-0d580fbd2db084a5c96ee9c00492236a279d5e0f.tar.gz linux-0d580fbd2db084a5c96ee9c00492236a279d5e0f.tar.bz2 linux-0d580fbd2db084a5c96ee9c00492236a279d5e0f.zip | |
tcp: refactor tcp_retransmit_timer()
It appears linux-4.14 stable needs a backport of commit
88f8598d0a30 ("tcp: exit if nothing to retransmit on RTO timeout")
Since tcp_rtx_queue_empty() is not in pre 4.15 kernels,
let's refactor tcp_retransmit_timer() to only use tcp_rtx_queue_head()
I will provide to stable teams the squashed patches.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/tcp_timer.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c index dd5a6317a801..1097b438befe 100644 --- a/net/ipv4/tcp_timer.c +++ b/net/ipv4/tcp_timer.c @@ -434,6 +434,7 @@ void tcp_retransmit_timer(struct sock *sk) struct net *net = sock_net(sk); struct inet_connection_sock *icsk = inet_csk(sk); struct request_sock *req; + struct sk_buff *skb; req = rcu_dereference_protected(tp->fastopen_rsk, lockdep_sock_is_held(sk)); @@ -446,7 +447,12 @@ void tcp_retransmit_timer(struct sock *sk) */ return; } - if (!tp->packets_out || WARN_ON_ONCE(tcp_rtx_queue_empty(sk))) + + if (!tp->packets_out) + return; + + skb = tcp_rtx_queue_head(sk); + if (WARN_ON_ONCE(!skb)) return; tp->tlp_high_seq = 0; @@ -480,7 +486,7 @@ void tcp_retransmit_timer(struct sock *sk) goto out; } tcp_enter_loss(sk); - tcp_retransmit_skb(sk, tcp_rtx_queue_head(sk), 1); + tcp_retransmit_skb(sk, skb, 1); __sk_dst_reset(sk); goto out_reset_timer; } |