linux-kernel - Re: [PATCH v6 05/13] iio: inkern: Remove the 'unused' variable usage in iio_channel_read

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Date:   Tue, 27 Jun 2023 09:56:14 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Herve Codina <herve.codina@...tlin.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
CC:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        Wojciech Ziemba <wojciech.ziemba@...el.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH v6 05/13] iio: inkern: Remove the 'unused' variable usage
 in iio_channel_read_max()



Le 23/06/2023 à 10:58, Herve Codina a écrit :
> The code uses a local variable to initialize a null pointer in order to
> avoid accessing this null pointer later on.
> 
> Simply removed the 'unused' variable and check for the null pointer just
> before accessing it.
> 
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>

> ---
>   drivers/iio/inkern.c | 7 ++-----
>   1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
> index f738db9a0c04..ce537b4ca6ca 100644
> --- a/drivers/iio/inkern.c
> +++ b/drivers/iio/inkern.c
> @@ -849,14 +849,10 @@ static int iio_channel_read_max(struct iio_channel *chan,
>   				int *val, int *val2, int *type,
>   				enum iio_chan_info_enum info)
>   {
> -	int unused;
>   	const int *vals;
>   	int length;
>   	int ret;
>   
> -	if (!val2)
> -		val2 = &unused;
> -
>   	ret = iio_channel_read_avail(chan, &vals, type, &length, info);
>   	if (ret < 0)
>   		return ret;
> @@ -869,7 +865,8 @@ static int iio_channel_read_max(struct iio_channel *chan,
>   			break;
>   		default:
>   			*val = vals[4];
> -			*val2 = vals[5];
> +			if (val2)
> +				*val2 = vals[5];
>   		}
>   		return 0;
>