linux-kernel - Re: [PATCH 01/14] iio: adc: sc27xx: Introduce local variable 'struct device *dev'

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Date:   Sun, 14 Jul 2019 15:50:52 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Fuqian Huang <huangfq.daxian@...il.com>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        freeman.liu@...eadtrum.com
Subject: Re: [PATCH 01/14] iio: adc: sc27xx: Introduce local variable
 'struct device *dev'

On Mon,  8 Jul 2019 20:32:21 +0800
Fuqian Huang <huangfq.daxian@...il.com> wrote:

> Introduce local variable 'struct device *dev' and use it instead of
> dereferencing it repeatly.
> 
> Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>

Ok, this is a fair bit of churn but probably on balance a worthwhile
little improvement.

Applied to the togreg branch of iio.git and pushed out
as testing to see if we missed anything.

+CC Freeman Liu as original author.

Thanks,

Jonathan


> ---
>  drivers/iio/adc/sc27xx_adc.c | 41 +++++++++++++++++++++--------------------
>  1 file changed, 21 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/iio/adc/sc27xx_adc.c b/drivers/iio/adc/sc27xx_adc.c
> index f7f7a18904b4..ec86f640e963 100644
> --- a/drivers/iio/adc/sc27xx_adc.c
> +++ b/drivers/iio/adc/sc27xx_adc.c
> @@ -504,88 +504,89 @@ static void sc27xx_adc_free_hwlock(void *_data)
>  
>  static int sc27xx_adc_probe(struct platform_device *pdev)
>  {
> -	struct device_node *np = pdev->dev.of_node;
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
>  	struct sc27xx_adc_data *sc27xx_data;
>  	struct iio_dev *indio_dev;
>  	int ret;
>  
> -	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*sc27xx_data));
> +	indio_dev = devm_iio_device_alloc(dev, sizeof(*sc27xx_data));
>  	if (!indio_dev)
>  		return -ENOMEM;
>  
>  	sc27xx_data = iio_priv(indio_dev);
>  
> -	sc27xx_data->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> +	sc27xx_data->regmap = dev_get_regmap(dev->parent, NULL);
>  	if (!sc27xx_data->regmap) {
> -		dev_err(&pdev->dev, "failed to get ADC regmap\n");
> +		dev_err(dev, "failed to get ADC regmap\n");
>  		return -ENODEV;
>  	}
>  
>  	ret = of_property_read_u32(np, "reg", &sc27xx_data->base);
>  	if (ret) {
> -		dev_err(&pdev->dev, "failed to get ADC base address\n");
> +		dev_err(dev, "failed to get ADC base address\n");
>  		return ret;
>  	}
>  
>  	sc27xx_data->irq = platform_get_irq(pdev, 0);
>  	if (sc27xx_data->irq < 0) {
> -		dev_err(&pdev->dev, "failed to get ADC irq number\n");
> +		dev_err(dev, "failed to get ADC irq number\n");
>  		return sc27xx_data->irq;
>  	}
>  
>  	ret = of_hwspin_lock_get_id(np, 0);
>  	if (ret < 0) {
> -		dev_err(&pdev->dev, "failed to get hwspinlock id\n");
> +		dev_err(dev, "failed to get hwspinlock id\n");
>  		return ret;
>  	}
>  
>  	sc27xx_data->hwlock = hwspin_lock_request_specific(ret);
>  	if (!sc27xx_data->hwlock) {
> -		dev_err(&pdev->dev, "failed to request hwspinlock\n");
> +		dev_err(dev, "failed to request hwspinlock\n");
>  		return -ENXIO;
>  	}
>  
> -	ret = devm_add_action(&pdev->dev, sc27xx_adc_free_hwlock,
> +	ret = devm_add_action(dev, sc27xx_adc_free_hwlock,
>  			      sc27xx_data->hwlock);
>  	if (ret) {
>  		sc27xx_adc_free_hwlock(sc27xx_data->hwlock);
> -		dev_err(&pdev->dev, "failed to add hwspinlock action\n");
> +		dev_err(dev, "failed to add hwspinlock action\n");
>  		return ret;
>  	}
>  
>  	init_completion(&sc27xx_data->completion);
> -	sc27xx_data->dev = &pdev->dev;
> +	sc27xx_data->dev = dev;
>  
>  	ret = sc27xx_adc_enable(sc27xx_data);
>  	if (ret) {
> -		dev_err(&pdev->dev, "failed to enable ADC module\n");
> +		dev_err(dev, "failed to enable ADC module\n");
>  		return ret;
>  	}
>  
> -	ret = devm_add_action(&pdev->dev, sc27xx_adc_disable, sc27xx_data);
> +	ret = devm_add_action(dev, sc27xx_adc_disable, sc27xx_data);
>  	if (ret) {
>  		sc27xx_adc_disable(sc27xx_data);
> -		dev_err(&pdev->dev, "failed to add ADC disable action\n");
> +		dev_err(dev, "failed to add ADC disable action\n");
>  		return ret;
>  	}
>  
> -	ret = devm_request_threaded_irq(&pdev->dev, sc27xx_data->irq, NULL,
> +	ret = devm_request_threaded_irq(dev, sc27xx_data->irq, NULL,
>  					sc27xx_adc_isr, IRQF_ONESHOT,
>  					pdev->name, sc27xx_data);
>  	if (ret) {
> -		dev_err(&pdev->dev, "failed to request ADC irq\n");
> +		dev_err(dev, "failed to request ADC irq\n");
>  		return ret;
>  	}
>  
> -	indio_dev->dev.parent = &pdev->dev;
> -	indio_dev->name = dev_name(&pdev->dev);
> +	indio_dev->dev.parent = dev;
> +	indio_dev->name = dev_name(dev);
>  	indio_dev->modes = INDIO_DIRECT_MODE;
>  	indio_dev->info = &sc27xx_info;
>  	indio_dev->channels = sc27xx_channels;
>  	indio_dev->num_channels = ARRAY_SIZE(sc27xx_channels);
> -	ret = devm_iio_device_register(&pdev->dev, indio_dev);
> +	ret = devm_iio_device_register(dev, indio_dev);
>  	if (ret)
> -		dev_err(&pdev->dev, "could not register iio (ADC)");
> +		dev_err(dev, "could not register iio (ADC)");
>  
>  	return ret;
>  }