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

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Date:   Mon, 25 Oct 2021 14:31:32 +0300
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, Oct 25, 2021 at 12:42 PM Hans de Goede <hdegoede@...hat.com> wrote:
>
> The discrete.c code is not the only code which needs to lookup the
> acpi_device and device-name for the sensor for which the INT3472
> ACPI-device is a GPIO/clk/regulator provider.
>
> The tps68470.c code also needs this functionality, so factor this
> out into a new get_sensor_adev_and_name() helper.

...

> +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;

?

> +}

-- 
With Best Regards,
Andy Shevchenko