[PATCH v3 1/9] iio: adc: ab8500-gpadc: Make use of the helper function dev_err_probe()

[Jonathan Cameron]

On Tue, 28 Sep 2021 22:19:47 +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.
> 
> Reviewed-by: Linus Walleij <linus.walleij at linaro.org>
> Signed-off-by: Cai Huoqing <caihuoqing at baidu.com>

I believe we could in theory get an -EPROBE_DEFER from
platform_get_irq_by_name() so we should handle that one similarly.

I have no idea if can actually happen on this platform, but seems to me
that we should be thorough given how easy it is to do here.

Thanks,

Jonathan

> ---
> v1->v2: Remove the separate line of PTR_ERR().
> 
>  drivers/iio/adc/ab8500-gpadc.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iio/adc/ab8500-gpadc.c b/drivers/iio/adc/ab8500-gpadc.c
> index 7b5212ba5501..c58d0e2ae538 100644
> --- a/drivers/iio/adc/ab8500-gpadc.c
> +++ b/drivers/iio/adc/ab8500-gpadc.c
> @@ -1146,11 +1146,9 @@ 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) {