linux-kernel - [PATCH 5.14 531/849] sctp: reset probe_timer in sctp_transport_pl

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Date:   Mon, 15 Nov 2021 18:00:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Xin Long <lucien.xin@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 531/849] sctp: reset probe_timer in sctp_transport_pl_update

From: Xin Long <lucien.xin@...il.com>

[ Upstream commit c6ea04ea692fa0d8e7faeb133fcd28e3acf470a0 ]

sctp_transport_pl_update() is called when transport update its dst and
pathmtu, instead of stopping the PLPMTUD probe timer, PLPMTUD should
start over and reset the probe timer. Otherwise, the PLPMTUD service
would stop.

Fixes: 92548ec2f1f9 ("sctp: add the probe timer in transport for PLPMTUD")
Signed-off-by: Xin Long <lucien.xin@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/net/sctp/sctp.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index 69bab88ad66b1..bc00410223b03 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -653,12 +653,10 @@ static inline void sctp_transport_pl_update(struct sctp_transport *t)
 	if (t->pl.state == SCTP_PL_DISABLED)
 		return;
 
-	if (del_timer(&t->probe_timer))
-		sctp_transport_put(t);
-
 	t->pl.state = SCTP_PL_BASE;
 	t->pl.pmtu = SCTP_BASE_PLPMTU;
 	t->pl.probe_size = SCTP_BASE_PLPMTU;
+	sctp_transport_reset_probe_timer(t);
 }
 
 static inline bool sctp_transport_pl_enabled(struct sctp_transport *t)
-- 
2.33.0