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

…nsmission

commit 9ad1da1 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: 9d71dd0 ("can: add support of SAE J1939 protocol")
Cc: [email protected]
Reported-by: Alexander Hölzl <[email protected]>
Tested-by: Alexander Hölzl <[email protected]>
Signed-off-by: Oleksij Rempel <[email protected]>
Link: https://lore.kernel.org/all/[email protected]
Cc: [email protected]
Signed-off-by: Marc Kleine-Budde <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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;
 	}