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

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Date:   Mon, 1 Nov 2021 12:44:49 +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 12:31 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:

...

> >> +int skl_int3472_get_sensor_adev_and_name(struct device *dev,
> >> +                                        struct acpi_device **sensor_adev_ret,
> >> +                                        const char **name_ret)
> >> +{
> >> +       struct acpi_device *adev = ACPI_COMPANION(dev);
> >> +       struct acpi_device *sensor;
> >> +       int ret = 0;
> >> +
> >> +       sensor = acpi_dev_get_first_consumer_dev(adev);
> >> +       if (!sensor) {
> >> +               dev_err(dev, "INT3472 seems to have no dependents.\n");
> >> +               return -ENODEV;
> >> +       }
> >> +
> >> +       *name_ret = devm_kasprintf(dev, GFP_KERNEL, I2C_DEV_NAME_FORMAT,
> >> +                                  acpi_dev_name(sensor));
> >> +       if (!*name_ret)
> >> +               ret = -ENOMEM;
> >> +
> >> +       if (ret == 0 && sensor_adev_ret)
> >> +               *sensor_adev_ret = sensor;
> >> +       else
> >> +               acpi_dev_put(sensor);
> >> +
> >> +       return ret;
> >
> > The error path is twisted a bit including far staying ret=0 assignment.
> >
> > Can it be
> >
> >        int ret;
> >        ...
> >        *name_ret = devm_kasprintf(dev, GFP_KERNEL, I2C_DEV_NAME_FORMAT,
> >                                   acpi_dev_name(sensor));
> >        if (!*name_ret) {
> >                acpi_dev_put(sensor);
> >                return -ENOMEM;
> >        }
> >
> >        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(...);

?

-- 
With Best Regards,
Andy Shevchenko