linux-kernel - Re: [PATCH v1] PM: runtime: Avoid device usage count underflows

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Message-ID: <CAHp75VeS+3-N9rV3CfTLHKKD_pzTHrz4Lnv5XsEbd22CoCJeKw@mail.gmail.com>
Date:   Mon, 11 Apr 2022 19:49:20 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH v1] PM: runtime: Avoid device usage count underflows

On Mon, Apr 11, 2022 at 6:17 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
> On Mon, Apr 11, 2022 at 5:09 PM Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
> > On Wed, Apr 6, 2022 at 11:49 PM Rafael J. Wysocki <rjw@...ysocki.net> wrote:

...

> > > +               retval = rpm_drop_usage_count(dev);
> > > +               if (retval > 0) {
> > >                         trace_rpm_usage_rcuidle(dev, rpmflags);
> > >                         return 0;
> > > +               } else if (retval < 0) {
> > > +                       return retval;
> > >                 }
> >
> > Can be written in a form
> >
> >                if (retval < 0)
> >                        return retval;
> >                if (retval > 0) {
> >                        trace_rpm_usage_rcuidle(dev, rpmflags);
> >                        return 0;
> >                }
> >
>
> I know.
>
> And why would it be better?

Depends on the perception:
a) less characters to parse (no 'else');
b) checking for errors first, which seems more or less standard pattern.

-- 
With Best Regards,
Andy Shevchenko