can: j1939: transport: make sure the aborted session will be deactivated only once
j1939_session_cancel() was modifying session->state without protecting it by locks and without checking actual state of the session. This patch moves j1939_tp_set_rxtimeout() into j1939_session_cancel() and adds the missing locking. Fixes: 9d71dd0c ("can: add support of SAE J1939 protocol") Signed-off-by:Oleksij Rempel <o.rempel@pengutronix.de>
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