linux-kernel - Re: [PATCH v3 5/9] iio: adc: max1241: Make use of the helper function dev_err

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Message-ID: <20210929174019.3f93dfde@jic23-huawei>
Date:   Wed, 29 Sep 2021 17:40:19 +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 5/9] iio: adc: max1241: Make use of the helper
 function dev_err_probe()

On Tue, 28 Sep 2021 22:19:51 +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,

Please also add a message to the
devm_gpiod_get_optional() and similar handling so that we
maintain information on that as well.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/max1241.c | 14 ++++++--------
>  1 file changed, 6 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/iio/adc/max1241.c b/drivers/iio/adc/max1241.c
> index b60f8448f21a..130ca8dc6fa0 100644
> --- a/drivers/iio/adc/max1241.c
> +++ b/drivers/iio/adc/max1241.c
> @@ -148,10 +148,9 @@ static int max1241_probe(struct spi_device *spi)
>  	mutex_init(&adc->lock);
>  
>  	adc->vdd = devm_regulator_get(dev, "vdd");
> -	if (IS_ERR(adc->vdd)) {
> -		dev_err(dev, "failed to get vdd regulator\n");
> -		return PTR_ERR(adc->vdd);
> -	}
> +	if (IS_ERR(adc->vdd))
> +		return dev_err_probe(dev, PTR_ERR(adc->vdd),
> +				     "failed to get vdd regulator\n");
>  
>  	ret = regulator_enable(adc->vdd);
>  	if (ret)
> @@ -164,10 +163,9 @@ static int max1241_probe(struct spi_device *spi)
>  	}
>  
>  	adc->vref = devm_regulator_get(dev, "vref");
> -	if (IS_ERR(adc->vref)) {
> -		dev_err(dev, "failed to get vref regulator\n");
> -		return PTR_ERR(adc->vref);
> -	}
> +	if (IS_ERR(adc->vref))
> +		return dev_err_probe(dev, PTR_ERR(adc->vref),
> +				     "failed to get vref regulator\n");
>  
>  	ret = regulator_enable(adc->vref);
>  	if (ret)