linux-kernel - Re: [PATCH] staging: iio: cdc: ad7746: Fix unnecessary check and assignment in ad7746

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Date:   Mon, 17 May 2021 19:14:13 -0300
From:   Marcelo Schmitt <marcelo.schmitt1@...il.com>
To:     Tang Bin <tangbin@...s.chinamobile.com>
Cc:     lars@...afoo.de, Michael.Hennerich@...log.com, jic23@...nel.org,
        knaack.h@....de, pmeerw@...erw.net, gregkh@...uxfoundation.org,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, lucas.p.stankus@...il.com
Subject: Re: [PATCH] staging: iio: cdc: ad7746: Fix unnecessary check and
 assignment in ad7746_probe()

Hi Tang,

The patch looks overall good, though I think it could be split into two
pieces: one for simplifying ret declaration and another for removing the
check after device register.
Despite that, I guess Lucas might already be working on similar changes.
https://lore.kernel.org/linux-iio/cover.1620766020.git.lucas.p.stankus@gmail.com/

As general advice, I would recommend avoiding using generic words such
as fix in the subject line. It's often better to say something about the
nature of what is being done.


Cc: lucas.p.stankus@...il.com


Best regards,

Marcelo

On 05/17, Tang Bin wrote:
> In the function ad7746_probe(), the return value of
> devm_iio_device_register() can be zero or ret, thus it is
> unnecessary to repeated check here. And delete unused
> initialized value of 'ret', because it will be assigned by
> the function i2c_smbus_write_byte_data().
> 
> Signed-off-by: Tang Bin <tangbin@...s.chinamobile.com>
> ---
>  drivers/staging/iio/cdc/ad7746.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
> index dfd71e99e..d3b6e68df 100644
> --- a/drivers/staging/iio/cdc/ad7746.c
> +++ b/drivers/staging/iio/cdc/ad7746.c
> @@ -680,7 +680,7 @@ static int ad7746_probe(struct i2c_client *client,
>  	struct ad7746_chip_info *chip;
>  	struct iio_dev *indio_dev;
>  	unsigned char regval = 0;
> -	int ret = 0;
> +	int ret;
>  
>  	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
>  	if (!indio_dev)
> @@ -730,11 +730,7 @@ static int ad7746_probe(struct i2c_client *client,
>  	if (ret < 0)
>  		return ret;
>  
> -	ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
> -	if (ret)
> -		return ret;
> -
> -	return 0;
> +	return devm_iio_device_register(indio_dev->dev.parent, indio_dev);
>  }
>  
>  static const struct i2c_device_id ad7746_id[] = {
> -- 
> 2.20.1.windows.1
> 
> 
>