Re: [PATCH v5 2/3] ACPI: allow longer device IDs

Jason A. Donenfeld
2022-02-28T18:35:30Z

Hi Rafael,

On Mon, Feb 28, 2022 at 7:19 PM Rafael J. Wysocki <rafael@kernel.org> wrote:
> Increasing the ACPI_ID_LEN value is fine with me, but the patch
> changelog is not entirely accurate.
>
> The ACPI subsystem uses struct acpi_device_id mostly (if not only) for
> device ID matching and it is generally used for creating lists of ACPI
> device IDs in drivers (and allow/deny lists etc). The device IDs
> extracted from the ACPI tables can be longer than ACPI_ID_LEN.
>
> This means that drivers cannot match device IDs longer than 8
> characters (excluding the terminating 0), because the IDs in the lists
> used by them for ID matching cannot be longer than this and not
> because the ACPI subsystem is limited by that value.

Thanks for your notes there. I think Ard more or less pointed out
something similar too. I'll amend the commit message, send a v2, and
hopefully this change is okay with Mika/Andy/Hans.

Regards,
Jason