Re: [PATCH 1/2] ASoC: SOF: mediatek: add mt8188 audio support

[Pierre-Louis Bossart]

On 5/15/23 10:05, Mark Brown wrote:
> On Mon, May 15, 2023 at 01:25:44PM +0200, AngeloGioacchino Del Regno wrote:
>> Il 15/05/23 07:25, Trevor Wu ha scritto:
> 
>>> +{
>>> +	/* common defaults */
>>> +	memcpy(&sof_mt8188_ops, &sof_mt8186_ops, sizeof(struct snd_sof_dsp_ops));
> 
>> Never use sizeof(type), always use destination var size! Anyway, there's more.
>>
>> I don't think we need to perform this memcpy: we'll never see an instance of
>> both mt8186 and mt8188 drivers on the same machine, so you can safely just use
>> sof_mt8186_ops for mt8188...
> 
>>> +	sof_mt8188_ops.drv = mt8188_dai;
> 
>> ...which obviously means that this becomes
> 
>> 	sof_mt8186_ops.drv = mt8188_dai;
> 
> This does have the issue that it then means the ops struct isn't const
> which isn't ideal.  It's also not the end of the world though so I don't
> have super strong feelings.

We do the same for Intel devices, we have a common structure which is
copied and only the members that differ in specific SOCs are updated.
You're right that it's not constant, but it avoids copy-paste of a
rather large structure just to change a couple of lines.