From: Xin Long lucien.xin@gmail.com
[ Upstream commit 8f35ae17ef565a605de5f409e04bcd49a55d7646 ]
It tries to avoid the frequently hb_timer refresh in commit ba6f5e33bdbb ("sctp: avoid refreshing heartbeat timer too often"), and it only allows mod_timer when the new expires is after hb_timer.expires. It means even a much shorter interval for hb timer gets applied, it will have to wait until the current hb timer to time out.
In sctp_do_8_2_transport_strike(), when a transport enters PF state, it expects to update the hb timer to resend a heartbeat every rto after calling sctp_transport_reset_hb_timer(), which will not work as the change mentioned above.
The frequently hb_timer refresh was caused by sctp_transport_reset_timers() called in sctp_outq_flush() and it was already removed in the commit above. So we don't have to check hb_timer.expires when resetting hb_timer as it is now not called very often.
Fixes: ba6f5e33bdbb ("sctp: avoid refreshing heartbeat timer too often") Signed-off-by: Xin Long lucien.xin@gmail.com Acked-by: Marcelo Ricardo Leitner marcelo.leitner@gmail.com Link: https://lore.kernel.org/r/d958c06985713ec84049a2d5664879802710179a.167509593... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/sctp/transport.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/net/sctp/transport.c b/net/sctp/transport.c index af56651169b2..79d2aa44c6e5 100644 --- a/net/sctp/transport.c +++ b/net/sctp/transport.c @@ -210,9 +210,7 @@ void sctp_transport_reset_hb_timer(struct sctp_transport *transport)
/* When a data chunk is sent, reset the heartbeat interval. */ expires = jiffies + sctp_transport_timeout(transport); - if ((time_before(transport->hb_timer.expires, expires) || - !timer_pending(&transport->hb_timer)) && - !mod_timer(&transport->hb_timer, + if (!mod_timer(&transport->hb_timer, expires + prandom_u32_max(transport->rto))) sctp_transport_hold(transport); }