linux-kernel - Re: [PATCH v3 3/3] staging: iio: ad7780: remove unnecessary stashed voltage value

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]

Date:   Thu, 1 Nov 2018 15:28:19 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "lars@...afoo.de" <lars@...afoo.de>,
        "knaack.h@....de" <knaack.h@....de>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "renatogeh@...il.com" <renatogeh@...il.com>,
        "giuliano.belinassi@....br" <giuliano.belinassi@....br>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "kernel-usp@...glegroups.com" <kernel-usp@...glegroups.com>
Subject: Re: [PATCH v3 3/3] staging: iio: ad7780: remove unnecessary stashed
 voltage value

On Thu, 2018-11-01 at 11:43 -0300, Renato Lui Geh wrote:
> This patch removes the unnecessary field int_vref_mv in ad7780_state
> referring to the device's voltage.
> 
> Signed-off-by: Renato Lui Geh <renatogeh@...il.com>
> ---
> Changes in v3:
> 	- removed unnecessary int_vref_mv from ad7780_state
> 
>  drivers/staging/iio/adc/ad7780.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/iio/adc/ad7780.c
> b/drivers/staging/iio/adc/ad7780.c
> index f2a11e9424cd..f250370efcf7 100644
> --- a/drivers/staging/iio/adc/ad7780.c
> +++ b/drivers/staging/iio/adc/ad7780.c
> @@ -42,7 +42,6 @@ struct ad7780_state {
>  	struct regulator		*reg;
>  	struct gpio_desc		*powerdown_gpio;
>  	unsigned int	gain;
> -	u16				int_vref_mv;
>  
>  	struct ad_sigma_delta sd;
>  };
> @@ -190,9 +189,7 @@ static int ad7780_probe(struct spi_device *spi)
>  	st->chip_info =
>  		&ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data];
>  
> -	if (voltage_uv)
> -		st->int_vref_mv = voltage_uv / 1000;
> -	else
> +	if (!voltage_uv)
>  		dev_warn(&spi->dev, "Reference voltage unspecified\n");

I think you could remove this altogether, and also remove the entire
`voltage_uv = regulator_get_voltage(st->reg);` assignment.

It doesn't make much sense to read the voltage here, since it won't be used
in the probe part anymore.

>  
>  	spi_set_drvdata(spi, indio_dev);