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

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Date:   Tue, 18 May 2021 11:19:18 +0800
From:   tangbin <tangbin@...s.chinamobile.com>
To:     Marcelo Schmitt <marcelo.schmitt1@...il.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
 andassignment in ad7746_probe()

Hi Marcelo:

On 2021/5/18 6:14, Marcelo Schmitt wrote:
> 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/

Thanks for your reply, I really don't know someone has send the similar one.

I forget this patch.


> 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.

OK, got it!

Thanks

Tang Bin

>
> 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
>>
>>
>>