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Subject[PATCH 3.12 118/176] can: kvaser_usb: Don't send a RESET_CHIP for non-existing channels
Date
From: "Ahmed S. Darwish" <ahmed.darwish@valeo.com>

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

===============

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@invetech.com.au>
Signed-off-by: Olivier Sobrie <olivier@sobrie.be>
Signed-off-by: Ahmed S. Darwish <ahmed.darwish@valeo.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
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 925273ca7879..63fb90b006ba 100644
--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -1494,6 +1494,10 @@ 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");
@@ -1597,9 +1601,6 @@ 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,
--
2.2.2


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