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

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Date:   Mon, 28 Feb 2022 19:21:00 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Alexander Graf <graf@...zon.com>, Len Brown <lenb@...nel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH v5 2/3] ACPI: allow longer device IDs

Hi Rafael,

On Mon, Feb 28, 2022 at 7:19 PM Rafael J. Wysocki <rafael@...nel.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