Re: [PATCH v2 1/1] iio: humidity: hdc100x: add manufacturer and device ID cehck

[Potin Lai <potin.lai.pt@gmail.com>]

On 7/27/22 18:00, Andy Shevchenko wrote:
> On Wed, Jul 27, 2022 at 8:46 AM Potin Lai <potin.lai.pt@gmail.com> wrote:
>> Add manufacturer and device ID checking during probe, and skip the
>> checking if chip model not supported.
>>
>> Supported:
>> - HDC1000
>> - HDC1010
>> - HDC1050
>> - HDC1080
>>
>> Not supported:
>> - HDC1008
> Thanks for an update, my comments below.
>
> ...
>
>> +       const struct of_device_id *match;
> Don't you have a compiler warning? Always compile your code with `make W=1`
>
> ...

You are correct, I will remove this unused variable.

>> +       data = device_get_match_data(&client->dev);
>> +       if (data) {
> This check is redundant. Too much protective programming. Just oblige
> that matched ID has to always have an associated data.
Is it guaranteed that device_get_match_data will not return NULL? I find some examples in other drivers, all of them have a check on returned data.

Will it be more appropriate if I move device_get_match_data to probe function, and return EINVAL when we get a NULL pointer from device_get_match_data?

>> +               if (!data->support_mfr_check)
>> +                       return true;
>> +       }
> ...
>
>> -       .probe = hdc100x_probe,
>> +       .probe_new = hdc100x_probe,
> Make this a separate patch before the presented one.
>
got it, will move this into a separate patch in next version.

thanks,
Potin