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can: j1939: transport: j1939_cancel_active_session(): use hrtimer_try_to_cancel() instead of hrtimer_cancel() 

This part of the code protected by lock used in the hrtimer as well.
Using hrtimer_cancel() will trigger dead lock.

Fixes: 9d71dd0c70 ("can: add support of SAE J1939 protocol")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
This commit is contained in:
Oleksij Rempel 2019-11-08 14:02:10 +01:00 committed by Marc Kleine-Budde
parent 62ebce1dc1
commit 8d7a5f000e
1 changed files with 5 additions and 1 deletions
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6
net/can/j1939/transport.c
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@ -2039,7 +2039,11 @@ int j1939_cancel_active_session(struct j1939_priv *priv, struct sock *sk)
&priv->active_session_list,
active_session_list_entry) {
if (!sk || sk == session->sk) {
j1939_session_timers_cancel(session);
if (hrtimer_try_to_cancel(&session->txtimer) == 1)
j1939_session_put(session);
if (hrtimer_try_to_cancel(&session->rxtimer) == 1)
j1939_session_put(session);
session->err = ESHUTDOWN;
j1939_session_deactivate_locked(session);
}