On Di, 2018-07-24 at 15:36 -0700, Patong Yang wrote:
> +static int xrusb_ctrl_msg(struct xrusb *xrusb,
> +               int request, int value, void *buf, int len)
> +{
> +       int rv = usb_control_msg(xrusb->dev,
> +               usb_sndctrlpipe(xrusb->dev, 0),
> +               request,
> +               USB_RT_XRUSB,
> +               value,
> +               xrusb->control->altsetting[0].desc.bInterfaceNumber,
> +               buf,
> +               len,
> +               5000);

Please use the symbolic constant.

> +       return rv < 0 ? rv : 0;
> +}

        Regards
                Oliver

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