can: j1939: j1939_tp_rxtimer(): fix errant alert in j1939_tp_rxtimer

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: 877b9bba3266 ("can: add support of SAE J1939 protocol")
Link: https://lore.kernel.org/all/20210906094219.95924-1-william.xuanziyang@huawei.com
Cc: stable@vger.kernel.org
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
index 6571895228f01014269fe846aca98df6bc2f5854..e1d3a6ba2d0e10b22f82199710c84830e5c52ac3 100644 (file)
--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -1230,12 +1230,11 @@ static enum hrtimer_restart j1939_tp_rxtimer(struct hrtimer *hrtimer)
                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),