can: c_can: end pending transmission on network stop (ifdown)

Put controller into init mode in network stop to end pending transmissions. The
issue is observed in cases when transmitted frame is not acked.

Signed-off-by: Viktor Babrian <babrian.viktor@renyi.mta.hu>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index f94a9fa60488ed8e23523f5f8c3665133f039dbb..c672c4dcffac14349d20d362dd5b199dd9bcd95c 100644 (file)
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -615,6 +615,9 @@ static void c_can_stop(struct net_device *dev)
 
        c_can_irq_control(priv, false);
 
+       /* put ctrl to init on stop to end ongoing transmission */
+       priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_INIT);
+
        /* deactivate pins */
        pinctrl_pm_select_sleep_state(dev->dev.parent);
        priv->can.state = CAN_STATE_STOPPED;