linux-kernel - Re: [PATCH v3 1/9] iio: adc: ab8500-gpadc: Make use of the helper function dev_err

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210929172021.4b797990@jic23-huawei>
Date:   Wed, 29 Sep 2021 17:20:21 +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 1/9] iio: adc: ab8500-gpadc: Make use of the helper
 function dev_err_probe()

On Tue, 28 Sep 2021 22:19:47 +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.
> 
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Cai Huoqing <caihuoqing@...du.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) {