linux-kernel - Re: [PATCH 2/5] iio: Add support for LMP92001 ADC

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Date:   Fri, 18 Aug 2017 09:58:35 +0700
From:   jmondi <jacopo@...ndi.org>
To:     Abhisit Sangjan <s.abhisit@...il.com>
Cc:     Peter Meerwald-Stadler <pmeerw@...erw.net>, jic23@...nel.org,
        knaack.h@....de, lars@...afoo.de, fabrice.gasnier@...com,
        Lee Jones <lee.jones@...aro.org>, robh@...nel.org,
        Akinobu Mita <akinobu.mita@...il.com>,
        marek.vasut+renesas@...il.com, jacopo+renesas@...ndi.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH 2/5] iio: Add support for LMP92001 ADC

Hi Abhisit,

On Fri, Aug 18, 2017 at 09:34:16AM +0700, Abhisit Sangjan wrote:
> Hi Jmondi,
>
> Thank you for your recommend, I am testing the code will be send the new
> patch in soon.

[snip]

> > > > +
> > > > +        switch (mask)
> > > > +        {
> > > > +        case IIO_CHAN_INFO_RAW:
> > > > +                switch (channel->type) {
> > > > +                case IIO_VOLTAGE:
> > > > +                case IIO_TEMP:
> > > > +                        *val = code;
> > > > +                        return IIO_VAL_INT;
> > > > +                default:
> > > > +                        break;
> > > > +                }
> > > > +                break;
> > > > +        default:
> > > > +                break;
> >
> > You can remove these default cases or return -EINVAL here.
> >
>
> Abhisit: Okay, I will remove it.
>              Could you tell me in detail. Sorry, I do not understand the
> Technical.

This can potentially be reduced to

        switch (mask) {
        case IIO_CHAN_INFO_RAW:
                switch (channel->type) {
                case IIO_VOLTAGE:
                case IIO_TEMP:
                        *val = code;
                        return IIO_VAL_INT;
                }
         }

         return -EINVAL;


But that's definitely not a big deal, there are no optimization in
this code change, just less typing and less default: and break; here
and there