Hi!
Am 2012-12-06 17:44, schrieb Shawn Fisher:
+static int usb_8dev_send_cmd(struct usb_8dev_priv *priv,
+ struct usb_8dev_cmd_msg *out,
+ struct usb_8dev_cmd_msg *in)
+{
+ int err;
+ int num_bytes_read;
+ struct net_device *netdev;
+
+ netdev = priv->netdev;
+
+ out->begin = USB_8DEV_CMD_START;
+ out->end = USB_8DEV_CMD_END;
+
+ mutex_lock(&priv->usb_8dev_cmd_lock);
+
+ memcpy(priv->cmd_msg_buffer, out,
+ sizeof(struct usb_8dev_cmd_msg));
+
+ err = usb_8dev_send_cmd_msg(priv, priv->cmd_msg_buffer,
+ sizeof(struct usb_8dev_cmd_msg));
+ if (err < 0) {
+ netdev_err(netdev, "sending command message failed\n");
+ return err;
+ }
+
+ err = usb_8dev_wait_cmd_msg(priv, priv->cmd_msg_buffer,
+ sizeof(struct usb_8dev_cmd_msg),
+ &num_bytes_read);
+ if (err < 0) {
+ netdev_err(netdev, "no command message answer\n");
+ return err;
+ }
+
+ memcpy(in, priv->cmd_msg_buffer, sizeof(struct usb_8dev_cmd_msg));
+
+ mutex_unlock(&priv->usb_8dev_cmd_lock);
+
+ if (in->begin != USB_8DEV_CMD_START || in->end != USB_8DEV_CMD_END
||
+ num_bytes_read != 16 || in->opt1 != 0)
+ return -EPROTO;
+
+ return 0;
+}
Don't forget to unlock that mutex when an error occurs.
Thanks! I will create a new patch in the next days.
In the meanwhile you can find the fixed version here:
https://github.com/krumboeck/usb2can
regards,
Bernd
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