Re: [PATCH v4 6/9] iio: adc: meson_saradc: Make use of the helper function dev_err_probe()

[Jonathan Cameron <jic23@kernel.org>]

On Fri, 8 Oct 2021 17:28:54 +0800
Cai Huoqing <caihuoqing@baidu.com> wrote:

> When possible use dev_err_probe help to properly deal with the
> PROBE_DEFER error, the benefit is that DEFER issue will be logged
> in the devices_deferred debugfs file.
> Using dev_err_probe() can reduce code size, and the error value
> gets printed.
> 
> Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Make sure you don't miss any tags on previous versions.  This had:

Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> #Meson8b Odroid-C1


> v1->v2: Remove the separate line of PTR_ERR().
> 
>  drivers/iio/adc/meson_saradc.c | 39 +++++++++++++++-------------------
>  1 file changed, 17 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
> index 705d5e11a54b..62cc6fb0ef85 100644
> --- a/drivers/iio/adc/meson_saradc.c
> +++ b/drivers/iio/adc/meson_saradc.c
> @@ -1230,35 +1230,31 @@ static int meson_sar_adc_probe(struct platform_device *pdev)
>  		return ret;
>  
>  	priv->clkin = devm_clk_get(&pdev->dev, "clkin");
> -	if (IS_ERR(priv->clkin)) {
> -		dev_err(&pdev->dev, "failed to get clkin\n");
> -		return PTR_ERR(priv->clkin);
> -	}
> +	if (IS_ERR(priv->clkin))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(priv->clkin),
> +				     "failed to get clkin\n");
>  
>  	priv->core_clk = devm_clk_get(&pdev->dev, "core");
> -	if (IS_ERR(priv->core_clk)) {
> -		dev_err(&pdev->dev, "failed to get core clk\n");
> -		return PTR_ERR(priv->core_clk);
> -	}
> +	if (IS_ERR(priv->core_clk))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(priv->core_clk),
> +				     "failed to get core clk\n");
>  
>  	priv->adc_clk = devm_clk_get(&pdev->dev, "adc_clk");
>  	if (IS_ERR(priv->adc_clk)) {
> -		if (PTR_ERR(priv->adc_clk) == -ENOENT) {
> +		if (PTR_ERR(priv->adc_clk) == -ENOENT)
>  			priv->adc_clk = NULL;
> -		} else {
> -			dev_err(&pdev->dev, "failed to get adc clk\n");
> -			return PTR_ERR(priv->adc_clk);
> -		}
> +		else
> +			return dev_err_probe(&pdev->dev, PTR_ERR(priv->adc_clk),
> +					     "failed to get adc clk\n");
>  	}
>  
>  	priv->adc_sel_clk = devm_clk_get(&pdev->dev, "adc_sel");
>  	if (IS_ERR(priv->adc_sel_clk)) {
> -		if (PTR_ERR(priv->adc_sel_clk) == -ENOENT) {
> +		if (PTR_ERR(priv->adc_sel_clk) == -ENOENT)
>  			priv->adc_sel_clk = NULL;
> -		} else {
> -			dev_err(&pdev->dev, "failed to get adc_sel clk\n");
> -			return PTR_ERR(priv->adc_sel_clk);
> -		}
> +		else
> +			return dev_err_probe(&pdev->dev, PTR_ERR(priv->adc_sel_clk),
> +					     "failed to get adc_sel clk\n");
>  	}
>  
>  	/* on pre-GXBB SoCs the SAR ADC itself provides the ADC clock: */
> @@ -1269,10 +1265,9 @@ static int meson_sar_adc_probe(struct platform_device *pdev)
>  	}
>  
>  	priv->vref = devm_regulator_get(&pdev->dev, "vref");
> -	if (IS_ERR(priv->vref)) {
> -		dev_err(&pdev->dev, "failed to get vref regulator\n");
> -		return PTR_ERR(priv->vref);
> -	}
> +	if (IS_ERR(priv->vref))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(priv->vref),
> +				     "failed to get vref regulator\n");
>  
>  	priv->calibscale = MILLION;
>