linux-kernel - [PATCH 5.4 22/58] can: j1939: j1939_tp_rxtimer(): fix errant alert in j1939_tp

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Message-Id: <20211025190941.145550242@linuxfoundation.org>
Date:   Mon, 25 Oct 2021 21:14:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Ziyang Xuan <william.xuanziyang@...wei.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 5.4 22/58] can: j1939: j1939_tp_rxtimer(): fix errant alert in j1939_tp_rxtimer

From: Ziyang Xuan <william.xuanziyang@...wei.com>

commit b504a884f6b5a77dac7d580ffa08e482f70d1a30 upstream.

When the session state is J1939_SESSION_DONE, j1939_tp_rxtimer() will
give an alert "rx timeout, send abort", but do nothing actually. Move
the alert into session active judgment condition, it is more
reasonable.

One of the scenarios is that j1939_tp_rxtimer() execute followed by
j1939_xtp_rx_abort_one(). After j1939_xtp_rx_abort_one(), the session
state is J1939_SESSION_DONE, then j1939_tp_rxtimer() give an alert.

Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Link: https://lore.kernel.org/all/20210906094219.95924-1-william.xuanziyang@huawei.com
Cc: stable@...r.kernel.org
Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
Acked-by: Oleksij Rempel <o.rempel@...gutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/can/j1939/transport.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -1230,12 +1230,11 @@ static enum hrtimer_restart j1939_tp_rxt
 		session->err = -ETIME;
 		j1939_session_deactivate(session);
 	} else {
-		netdev_alert(priv->ndev, "%s: 0x%p: rx timeout, send abort\n",
-			     __func__, session);
-
 		j1939_session_list_lock(session->priv);
 		if (session->state >= J1939_SESSION_ACTIVE &&
 		    session->state < J1939_SESSION_ACTIVE_MAX) {
+			netdev_alert(priv->ndev, "%s: 0x%p: rx timeout, send abort\n",
+				     __func__, session);
 			j1939_session_get(session);
 			hrtimer_start(&session->rxtimer,
 				      ms_to_ktime(J1939_XTP_ABORT_TIMEOUT_MS),