linux-kernel - Re: [PATCH] hwmon: Use min() instead of doing it manually

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Date:   Tue, 28 Dec 2021 06:18:37 +0600
From:   Aleksandr Mezin <mezin.alexander@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, Abaci Robot <abaci@...ux.alibaba.com>
Subject: Re: [PATCH] hwmon: Use min() instead of doing it manually

On Mon, Dec 27, 2021 at 9:43 PM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On 12/27/21 3:36 AM, Jiapeng Chong wrote:
> > Eliminate following coccicheck warning:
> >
> > ./drivers/hwmon/nzxt-smart2.c:461:12-13: WARNING opportunity for min().
> >
> > Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> > Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
> > ---
> >   drivers/hwmon/nzxt-smart2.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/hwmon/nzxt-smart2.c b/drivers/hwmon/nzxt-smart2.c
> > index 534d39b8908e..b30de7441fbb 100644
> > --- a/drivers/hwmon/nzxt-smart2.c
> > +++ b/drivers/hwmon/nzxt-smart2.c
> > @@ -458,7 +458,7 @@ static int send_output_report(struct drvdata *drvdata, const void *data,
> >
> >       ret = hid_hw_output_report(drvdata->hid, drvdata->output_buffer,
> >                                  sizeof(drvdata->output_buffer));
> > -     return ret < 0 ? ret : 0;
> > +     return min(ret, 0);
>
> Nack, that is just confusing. ret is an error if < 0, and min obfuscates
> that we want to return an error or 0.
>
> Guenter

Should I change that ternary operator to a full "if" maybe?
Apparently, both some people and some tools read it as "min()".