net: can: j1939: recover socket queue on CAN bus error during BAM transmission

commit 9ad1da14ab3bf23087ae45fe399d84a109ddb81a upstream.

Addresses an issue where a CAN bus error during a BAM transmission
could stall the socket queue, preventing further transmissions even
after the bus error is resolved. The fix activates the next queued
session after the error recovery, allowing communication to continue.

Fixes: 9d71dd0c70099 ("can: add support of SAE J1939 protocol")
Cc: stable@vger.kernel.org
Reported-by: Alexander Hölzl <alexander.hoelzl@gmx.net>
Tested-by: Alexander Hölzl <alexander.hoelzl@gmx.net>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/all/20240528070648.1947203-1-o.rempel@pengutronix.de
Cc: stable@vger.kernel.org
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 fe3df23a259578e13bb4ca449e0cc722f2eca95f..9805124d1676394704fc5eb4d1ee3e0f6b729f07 100644 (file)
--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -1681,6 +1681,8 @@ static int j1939_xtp_rx_rts_session_active(struct j1939_session *session,
 
                j1939_session_timers_cancel(session);
                j1939_session_cancel(session, J1939_XTP_ABORT_BUSY);
+               if (session->transmission)
+                       j1939_session_deactivate_activate_next(session);
 
                return -EBUSY;
        }