Re: [PATCH v3 04/11] driver core: Constify API device_find_child() then adapt for various usages

[Zijun Hu <zijun_hu@icloud.com>]

On 2024/12/6 15:21, Uwe Kleine-König wrote:
> Hello,
> 
> On Thu, Dec 05, 2024 at 08:10:13AM +0800, Zijun Hu wrote:
>> From: Zijun Hu <quic_zijuhu@quicinc.com>
>>
>> Constify the following API:
>> struct device *device_find_child(struct device *dev, void *data,
>> 		int (*match)(struct device *dev, void *data));
>> To :
>> struct device *device_find_child(struct device *dev, const void *data,
>>                                  device_match_t match);
>> typedef int (*device_match_t)(struct device *dev, const void *data);
>> with the following reasons:
>>
>> - Protect caller's match data @*data which is for comparison and lookup
>>   and the API does not actually need to modify @*data.
>>
>> - Make the API's parameters (@match)() and @data have the same type as
>>   all of other device finding APIs (bus|class|driver)_find_device().
>>
>> - All kinds of existing device match functions can be directly taken
>>   as the API's argument, they were exported by driver core.
>>
>> Constify the API and adapt for various existing usages by simply making
>> various match functions take 'const void *' as type of match data @data.
> 
> With the discussion that a new name would ease the conversion, maybe
> consider device_find_child_device() to also align the name (somewhat) to
> the above mentioned (bus|class|driver)_find_device()?
> i finally select this squashing method after considerations as shown by
link below:
https://lore.kernel.org/all/3a4de1bb-3eb2-469a-8ff7-ff706804f5bb@icloud.com

device_find_child() is consist with existing device_find_child_by_name()
and device_find_any_child, device's child is also a device, so we may
not need the tail _device().

> Do you have a merge plan already? I guess this patch will go through
> Greg's driver core tree?
> 

this patch series is already squashing solution.

yes. hope it move toward mainline by Greg's driver core tree.

(^^)(^^)

> Best regards
> Uwe