linux-kernel - [PATCH 3.13.y-ckt 32/80] can: c_can: end pending transmission on network stop (ifdown)

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Message-Id: <1426804568-2907-33-git-send-email-kamal@canonical.com>
Date:	Thu, 19 Mar 2015 15:35:20 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Viktor Babrian <babrian.viktor@...yi.mta.hu>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 32/80] can: c_can: end pending transmission on network stop (ifdown)

3.13.11-ckt17 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Viktor Babrian <babrian.viktor@...yi.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@...yi.mta.hu>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
[ kamal: backport to 3.13-stable: context ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/can/c_can/c_can.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 77061ee..4b17cd6 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -694,6 +694,9 @@ static void c_can_stop(struct net_device *dev)
 	/* disable all interrupts */
 	c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS);
 
+	/* put ctrl to init on stop to end ongoing transmission */
+	priv->write_reg(priv, C_CAN_CTRL_REG, CONTROL_INIT);
+
 	/* set the state as STOPPED */
 	priv->can.state = CAN_STATE_STOPPED;
 }
-- 
1.9.1

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