[PATCH v2] ASoC: core: clarify the driver name initialization

[Pierre-Louis Bossart]

Hi Jaroslav,

On 9/29/22 09:37, Jaroslav Kysela wrote:
> The driver field in the struct snd_ctl_card_info is a valid
> user space identifier. Actually, many ASoC drivers do not care
> and let to initialize this field using a standard wrapping method.
> Unfortunately, in this way, this field becomes unusable and
> unreadable for the drivers with longer card names. Also,
> there is a possibility to have clashes (driver field has
> only limit of 15 characters).
> 
> This change will print an error when the wrapping is used.
> The developers of the affected drivers should fix the problem.

How should we fix this problem?

I see all kinds of errors thrown in our first CI results based on 6.1-rc1:

[   12.684893] kernel: cml_rt1011_rt5682 cml_rt1011_rt5682: ASoC: driver
name too long 'sof-cml_rt1011_rt5682' -> 'sof-cml_rt1011_'

[   12.219660] kernel: bxt_da7219_max98357a glk_da7219_mx98357a: ASoC:
driver name too long 'sof-glkda7219max' -> 'sof-glkda7219ma'

I have no idea what is expected here in terms of naming. It's far from
obvious to respect the 15-character limit AND have something
readable/sensible given the proliferation of hardware skews.

Any suggestions?

Thanks,
-Pierre