linux-kernel - Re: [PATCH v3 2/9] iio: adc: imx7d_adc: Make use of the helper function dev_err

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Date:   Wed, 29 Sep 2021 17:26:27 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Cai Huoqing <caihuoqing@...du.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        "Pengutronix Kernel Team" <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        "NXP Linux Team" <linux-imx@....com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        "Neil Armstrong" <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Andy Gross <agross@...nel.org>,
        "Bjorn Andersson" <bjorn.andersson@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-arm-msm@...r.kernel.org>,
        <linux-rockchip@...ts.infradead.org>
Subject: Re: [PATCH v3 2/9] iio: adc: imx7d_adc: Make use of the helper
 function dev_err_probe()

On Tue, 28 Sep 2021 22:19:48 +0800
Cai Huoqing <caihuoqing@...du.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@...du.com>
Hi Cai,

It is currently not printing a message, but should we handle the same
for platform_get_irq?

One other minor comment inline.  Actual change here is fine.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/imx7d_adc.c | 16 +++++-----------
>  1 file changed, 5 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/iio/adc/imx7d_adc.c b/drivers/iio/adc/imx7d_adc.c
> index 4969a5f941e3..f47360cbff3b 100644
> --- a/drivers/iio/adc/imx7d_adc.c
> +++ b/drivers/iio/adc/imx7d_adc.c
> @@ -496,19 +496,13 @@ static int imx7d_adc_probe(struct platform_device *pdev)
>  		return irq;
>  
>  	info->clk = devm_clk_get(dev, "adc");
> -	if (IS_ERR(info->clk)) {
> -		ret = PTR_ERR(info->clk);
> -		dev_err(dev, "Failed getting clock, err = %d\n", ret);
> -		return ret;
> -	}
> +	if (IS_ERR(info->clk))
> +		return dev_err_probe(dev, PTR_ERR(info->clk), "Failed getting clock\n");

Where it doesn't hurt readabilty preferred to keep below 80 chars.

>  
>  	info->vref = devm_regulator_get(dev, "vref");
> -	if (IS_ERR(info->vref)) {
> -		ret = PTR_ERR(info->vref);
> -		dev_err(dev,
> -			"Failed getting reference voltage, err = %d\n", ret);
> -		return ret;
> -	}
> +	if (IS_ERR(info->vref))
> +		return dev_err_probe(dev, PTR_ERR(info->vref),
> +				     "Failed getting reference voltage\n");
>  
>  	platform_set_drvdata(pdev, indio_dev);
>