linux-kernel - Re: [PATCH] adc: correctly check return value

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Date:	Mon, 19 Oct 2015 21:05:11 +0200
From:	Hartmut Knaack <knaack.h@....de>
To:	Insu Yun <wuninsu@...il.com>, lars@...afoo.de,
	Michael.Hennerich@...log.com, jic23@...nel.org, pmeerw@...erw.net,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	taesoo@...ech.edu, yeongjin.jang@...ech.edu, insu@...ech.edu,
	changwoo@...ech.edu
Subject: Re: [PATCH] adc: correctly check return value

Insu Yun schrieb am 19.10.2015 um 18:08:
> Since devm_regulator_get returns address or error, not NULL,
> it needs to be checked with IS_ERR, not IS_ERR_OR_NULL.
> 

Actually, it does return NULL, if regulator support is disabled
(see [1]).

[1]http://lxr.free-electrons.com/source/include/linux/regulator/consumer.h#L286

> Signed-off-by: Insu Yun <wuninsu@...il.com>
> ---
>  drivers/iio/adc/ad7266.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/ad7266.c b/drivers/iio/adc/ad7266.c
> index 70f78c3..26cd54b 100644
> --- a/drivers/iio/adc/ad7266.c
> +++ b/drivers/iio/adc/ad7266.c
> @@ -397,7 +397,7 @@ static int ad7266_probe(struct spi_device *spi)
>  	st = iio_priv(indio_dev);
>  
>  	st->reg = devm_regulator_get(&spi->dev, "vref");
> -	if (!IS_ERR_OR_NULL(st->reg)) {
> +	if (!IS_ERR(st->reg)) {
>  		ret = regulator_enable(st->reg);
>  		if (ret)
>  			return ret;
> 

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