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can: kvaser_usb: Don't send a RESET_CHIP for non-existing channels

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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 <[email protected]>
Signed-off-by: Olivier Sobrie <[email protected]>
Signed-off-by: Ahmed S. Darwish <[email protected]>
Cc: linux-stable <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>
This commit is contained in:
Ahmed S. Darwish 2015-01-05 12:57:13 -05:00 • committed by Marc Kleine-Budde
commit 5e7e6e0c9b
1 changed files with 4 additions and 3 deletions
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7
drivers/net/can/usb/kvaser_usb.c
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@ -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,