linux-kernel - Re: [PATCH v4 08/11] platform/x86: int3472: Add get_sensor_adev_and

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Date:   Mon, 1 Nov 2021 12:46:37 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Mark Gross <markgross@...nel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Kate Hsuan <hpa@...hat.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v4 08/11] platform/x86: int3472: Add get_sensor_adev_and_name()
 helper

On Mon, Nov 1, 2021 at 12:44 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Mon, Nov 1, 2021 at 12:31 PM Hans de Goede <hdegoede@...hat.com> wrote:
> > On 10/25/21 13:31, Andy Shevchenko wrote:
> > > On Mon, Oct 25, 2021 at 12:42 PM Hans de Goede <hdegoede@...hat.com> wrote:

...

> > >> +       if (ret == 0 && sensor_adev_ret)
> > >> +               *sensor_adev_ret = sensor;
> > >> +       else
> > >> +               acpi_dev_put(sensor);
> > >> +
> > >> +       return ret;

...

> > >        if (sensor_adev_ret)
> > >                *sensor_adev_ret = sensor;
> > >
> > >        return 0;
> > >
> > > ?
> >
> > That misses an acpi_dev_put(sensor) when sensor_adev_ret == NULL.
>
> else
>   acpi_dev_put(...);
>
> ?

Hmm... But then in the original code and with this proposal the
acpi_dev_put() seems a bit strange to me.
If we are fine (no error code returned) why would the caller (note
_er_) go different paths?

-- 
With Best Regards,
Andy Shevchenko