[PATCH v4 1/9] iio: adc: ab8500-gpadc: Make use of the helper function dev_err_probe()

[Jonathan Cameron]

On Fri, 8 Oct 2021 17:28:49 +0800
Cai Huoqing <caihuoqing at 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 at baidu.com>
Hi Cai,

Series applied to the iio-togreg branch of iio.git and pushed out as testing
for 0-day to poke at it and see if it can find any problems we missed.

Thanks,

Jonathan

> ---
> v1->v2: Remove the separate line of PTR_ERR().
> v2: Reviewed-by: Linus Walleij <linus.walleij at linaro.org>
> 
> v2->v3: Handle platform_get_irq_byname() that returns -EPROBE_DEFER.
> 
>  drivers/iio/adc/ab8500-gpadc.c | 22 +++++++++-------------
>  1 file changed, 9 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/iio/adc/ab8500-gpadc.c b/drivers/iio/adc/ab8500-gpadc.c
> index 7b5212ba5501..4c46a201d4ef 100644
> --- a/drivers/iio/adc/ab8500-gpadc.c
> +++ b/drivers/iio/adc/ab8500-gpadc.c
> @@ -1103,17 +1103,15 @@ static int ab8500_gpadc_probe(struct platform_device *pdev)
>  		return ret;
>  
>  	gpadc->irq_sw = platform_get_irq_byname(pdev, "SW_CONV_END");
> -	if (gpadc->irq_sw < 0) {
> -		dev_err(dev, "failed to get platform sw_conv_end irq\n");
> -		return gpadc->irq_sw;
> -	}
> +	if (gpadc->irq_sw < 0)
> +		return dev_err_probe(dev, gpadc->irq_sw,
> +				     "failed to get platform sw_conv_end irq\n");
>  
>  	if (is_ab8500(gpadc->ab8500)) {
>  		gpadc->irq_hw = platform_get_irq_byname(pdev, "HW_CONV_END");
> -		if (gpadc->irq_hw < 0) {
> -			dev_err(dev, "failed to get platform hw_conv_end irq\n");
> -			return gpadc->irq_hw;
> -		}
> +		if (gpadc->irq_hw < 0)
> +			return dev_err_probe(dev, gpadc->irq_hw,
> +					     "failed to get platform hw_conv_end irq\n");
>  	} else {
>  		gpadc->irq_hw = 0;
>  	}
> @@ -1146,11 +1144,9 @@ static int ab8500_gpadc_probe(struct platform_device *pdev)
>  
>  	/* The VTVout LDO used to power the AB8500 GPADC */
>  	gpadc->vddadc = devm_regulator_get(dev, "vddadc");
> -	if (IS_ERR(gpadc->vddadc)) {
> -		ret = PTR_ERR(gpadc->vddadc);
> -		dev_err(dev, "failed to get vddadc\n");
> -		return ret;
> -	}
> +	if (IS_ERR(gpadc->vddadc))
> +		return dev_err_probe(dev, PTR_ERR(gpadc->vddadc),
> +				     "failed to get vddadc\n");
>  
>  	ret = regulator_enable(gpadc->vddadc);
>  	if (ret) {