linux-kernel - Re: [PATCH v5 3/3] iio: chemical: bme680: add power management

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Message-ID: <Z04N6GUSL2H0zt6_@smile.fi.intel.com>
Date: Mon, 2 Dec 2024 21:43:36 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Vasileios Amoiridis <vassilisamir@...il.com>
Cc: jic23@...nel.org, lars@...afoo.de, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, u.kleine-koenig@...gutronix.de,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/3] iio: chemical: bme680: add power management

On Mon, Dec 02, 2024 at 08:23:41PM +0100, Vasileios Amoiridis wrote:
> Add runtime power management to the device.

...

> +	ret = pm_runtime_resume_and_get(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = __bme680_read_raw(indio_dev, chan, val, val2, mask);
> +	pm_runtime_mark_last_busy(dev);
> +	pm_runtime_put_autosuspend(dev);

Side note: as long as idle method is not defined (NULL) the above dance is
already taken into account in the regular put.

...

> +static int bme680_buffer_preenable(struct iio_dev *indio_dev)
> +{
> +	struct bme680_data *data = iio_priv(indio_dev);
> +	struct device *dev = regmap_get_device(data->regmap);
> +	int ret;

> +	ret = pm_runtime_resume_and_get(dev);
> +	if (ret)
> +		return ret;
> +
> +	return 0;

Either this is broken (if the above can return positive codes), or can be
replaced with direct return:

	return pm_...

(but I believe it's the former and you wanted something like if (ret < 0)
 there).

> +}

-- 
With Best Regards,
Andy Shevchenko