releases/3.18.6/can-c_can-end-pending-transmission-on-network-stop-ifdown.patch

From 7ffd7b4e169d619e66928fe5d997723f2c6f1056 Mon Sep 17 00:00:00 2001
From: Viktor Babrian <babrian.viktor@renyi.mta.hu>
Date: Sun, 18 Jan 2015 20:01:40 +0100
Subject: can: c_can: end pending transmission on network stop (ifdown)

From: Viktor Babrian <babrian.viktor@renyi.mta.hu>

commit 7ffd7b4e169d619e66928fe5d997723f2c6f1056 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/can/c_can/c_can.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -611,6 +611,10 @@ static void c_can_stop(struct net_device
 	struct c_can_priv *priv = netdev_priv(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);
+
 	priv->can.state = CAN_STATE_STOPPED;
 }