On Mon, Mar 16, 2015 at 11:08:29AM +0800, Peter Hung wrote:
> Hello,
>
> Johan Hovold 於 2015/3/14 下午 08:02 寫道:
> > On Thu, Feb 26, 2015 at 06:02:10PM +0800, Peter Hung wrote:
> >> + if (status != sizeof(*val)) {
> >> + dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
> >> +
> >> + if (status == 0)
> >> + status = -EIO;
> >> + else
> >> + status = usb_translate_errors(status);
> >
> > Could you rewrite this as
> >
> > if (status < 0)
> > status = usb_translate_errors(status);
> > else
> > status = 0;
>
> In my definition the return value of set/getregister(), 0 is success,
> negative values are errors. The function usb_control_msg() return value
> is success transmited/received byte. It's maybe return 0. I want to
> treat 0 with error(-EIO). But if pass 0 to usb_translate_errors(), It
> will return 0 back. So I need especially handle with status == 0.
I meant to write
if (status < 0)
status = usb_translate_errors(status);
else
status = -EIO;
which I think is more readable.
Sorry for the confusion.
Johan
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