linux-kernel - [PATCH 3.16.y-ckt 022/135] can: kvaser_usb: Don't send a RESET

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Message-Id: <1423224113-10958-23-git-send-email-luis.henriques@canonical.com>
Date:	Fri,  6 Feb 2015 12:00:00 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Olivier Sobrie <olivier@...rie.be>,
	"Ahmed S. Darwish" <ahmed.darwish@...eo.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 022/135] can: kvaser_usb: Don't send a RESET_CHIP for non-existing channels

3.16.7-ckt6 -stable review patch.  If anyone has any objections, please let me know.

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

From: "Ahmed S. Darwish" <ahmed.darwish@...eo.com>

commit 5e7e6e0c9b47a45576c38b4a72d67927a5e049f7 upstream.

Recent Leaf firmware versions (>= 3.1.557) do not allow to send
commands for non-existing channels.  If a command is sent for a
non-existing channel, the firmware crashes.

Reported-by: Christopher Storah <Christopher.Storah@...etech.com.au>
Signed-off-by: Olivier Sobrie <olivier@...rie.be>
Signed-off-by: Ahmed S. Darwish <ahmed.darwish@...eo.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/net/can/usb/kvaser_usb.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
index 9accc8272c27..cc7bfc0c0a71 100644
--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -1503,6 +1503,10 @@ static int kvaser_usb_init_one(struct usb_interface *intf,
 	struct kvaser_usb_net_priv *priv;
 	int i, err;
 
+	err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
+	if (err)
+		return err;
+
 	netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
 	if (!netdev) {
 		dev_err(&intf->dev, "Cannot alloc candev\n");
@@ -1607,9 +1611,6 @@ static int kvaser_usb_probe(struct usb_interface *intf,
 
 	usb_set_intfdata(intf, dev);
 
-	for (i = 0; i < MAX_NET_DEVICES; i++)
-		kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, i);
-
 	err = kvaser_usb_get_software_info(dev);
 	if (err) {
 		dev_err(&intf->dev,
-- 
2.1.4

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