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Date: Wed, 20 Mar 2024 13:00:01 +0200
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Vasileios Amoiridis <vassilisamir@gmail.com>
Cc: jic23@kernel.org, lars@metafoo.de, ang.iglesiasg@gmail.com,
	mazziesaccount@gmail.com, ak@it-klinger.de,
	petre.rodan@subdimension.ro, phil@raspberrypi.com, 579lpy@gmail.com,
	linus.walleij@linaro.org, semen.protsenko@linaro.org,
	linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: Re: [PATCH v3 2/6] iio: pressure: Introduce new cleanup routines to
 BMP280 driver *_raw() functions
Message-ID: <ZfrBsY1rF-5stHqU@smile.fi.intel.com>
References: <20240319002925.2121016-1-vassilisamir@gmail.com>
 <20240319002925.2121016-3-vassilisamir@gmail.com>
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In-Reply-To: <20240319002925.2121016-3-vassilisamir@gmail.com>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo

On Tue, Mar 19, 2024 at 01:29:21AM +0100, Vasileios Amoiridis wrote:
> Introduce the new linux/cleanup.h with the guard(mutex) functionality
> in the {read/write}_raw() functions

Missing period at the end of the sentence.

..

>  	switch (mask) {
>  	case IIO_CHAN_INFO_PROCESSED:
>  		switch (chan->type) {
>  		case IIO_HUMIDITYRELATIVE:
> -			ret = data->chip_info->read_humid(data, val, val2);
> -			break;
> +			return data->chip_info->read_humid(data, val, val2);
>  		case IIO_PRESSURE:
> -			ret = data->chip_info->read_press(data, val, val2);
> -			break;
> +			return data->chip_info->read_press(data, val, val2);
>  		case IIO_TEMP:
> -			ret = data->chip_info->read_temp(data, val, val2);
> -			break;
> +			return data->chip_info->read_temp(data, val, val2);
>  		default:
> -			ret = -EINVAL;
> -			break;
> +			return -EINVAL;
>  		}

> -		break;
> +		return 0;

Now dead code.

>  	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
>  		switch (chan->type) {
>  		case IIO_HUMIDITYRELATIVE:
>  			*val = 1 << data->oversampling_humid;
> -			ret = IIO_VAL_INT;
> -			break;
> +			return IIO_VAL_INT;
>  		case IIO_PRESSURE:
>  			*val = 1 << data->oversampling_press;
> -			ret = IIO_VAL_INT;
> -			break;
> +			return IIO_VAL_INT;
>  		case IIO_TEMP:
>  			*val = 1 << data->oversampling_temp;
> -			ret = IIO_VAL_INT;
> -			break;
> +			return IIO_VAL_INT;
>  		default:
> -			ret = -EINVAL;
> -			break;
> +			return -EINVAL;
>  		}

> -		break;
> +		return 0;

Ditto.

>  	case IIO_CHAN_INFO_SAMP_FREQ:
>  		if (!data->chip_info->sampling_freq_avail) {
> -			ret = -EINVAL;
> -			break;
> +			return -EINVAL;
>  		}
>  
>  		*val = data->chip_info->sampling_freq_avail[data->sampling_freq][0];
>  		*val2 = data->chip_info->sampling_freq_avail[data->sampling_freq][1];
> -		ret = IIO_VAL_INT_PLUS_MICRO;
> -		break;
> +		return IIO_VAL_INT_PLUS_MICRO;
>  	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
>  		if (!data->chip_info->iir_filter_coeffs_avail) {
> -			ret = -EINVAL;
> -			break;
> +			return -EINVAL;
>  		}
>  
>  		*val = (1 << data->iir_filter_coeff) - 1;
> -		ret = IIO_VAL_INT;
> -		break;
> +		return IIO_VAL_INT;
>  	default:
> -		ret = -EINVAL;
> -		break;
> +		return -EINVAL;
>  	}

> -	mutex_unlock(&data->lock);
> +	return 0;

Ditto.

..

> +
> +

One blank line is enough.

> +static int bmp280_read_raw(struct iio_dev *indio_dev,
> +			   struct iio_chan_spec const *chan,
> +			   int *val, int *val2, long mask)

..

>  	switch (mask) {
>  	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> -		pm_runtime_get_sync(data->dev);
> -		mutex_lock(&data->lock);
>  		switch (chan->type) {
>  		case IIO_HUMIDITYRELATIVE:
> -			ret = bmp280_write_oversampling_ratio_humid(data, val);
> -			break;
> +			return bmp280_write_oversampling_ratio_humid(data, val);
>  		case IIO_PRESSURE:
> -			ret = bmp280_write_oversampling_ratio_press(data, val);
> -			break;
> +			return bmp280_write_oversampling_ratio_press(data, val);
>  		case IIO_TEMP:
> -			ret = bmp280_write_oversampling_ratio_temp(data, val);
> -			break;
> +			return bmp280_write_oversampling_ratio_temp(data, val);
>  		default:
> -			ret = -EINVAL;
> -			break;
> +			return -EINVAL;
>  		}
> -		mutex_unlock(&data->lock);
> -		pm_runtime_mark_last_busy(data->dev);
> -		pm_runtime_put_autosuspend(data->dev);
> -		break;
> +		return 0;
>  	case IIO_CHAN_INFO_SAMP_FREQ:
> -		pm_runtime_get_sync(data->dev);
> -		mutex_lock(&data->lock);
> -		ret = bmp280_write_sampling_frequency(data, val, val2);
> -		mutex_unlock(&data->lock);
> -		pm_runtime_mark_last_busy(data->dev);
> -		pm_runtime_put_autosuspend(data->dev);
> -		break;
> +		return bmp280_write_sampling_frequency(data, val, val2);
>  	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
> -		pm_runtime_get_sync(data->dev);
> -		mutex_lock(&data->lock);
> -		ret = bmp280_write_iir_filter_coeffs(data, val);
> -		mutex_unlock(&data->lock);
> -		pm_runtime_mark_last_busy(data->dev);
> -		pm_runtime_put_autosuspend(data->dev);
> -		break;
> +		return bmp280_write_iir_filter_coeffs(data, val);
>  	default:
>  		return -EINVAL;
>  	}
>  
> +	return 0;

As per above, dead code.

..

> +static int bmp280_write_raw(struct iio_dev *indio_dev,
> +			    struct iio_chan_spec const *chan,
> +			    int val, int val2, long mask)
> +{
> +	struct bmp280_data *data = iio_priv(indio_dev);

> +	int ret = 0;

Useless assignment.

> +
> +	pm_runtime_get_sync(data->dev);
> +	ret = bmp280_write_raw_guarded(indio_dev, chan, val, val2, mask);
> +	pm_runtime_mark_last_busy(data->dev);
> +	pm_runtime_put_autosuspend(data->dev);
> +
>  	return ret;
>  }

-- 
With Best Regards,
Andy Shevchenko