Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs

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To: Ard Biesheuvel <ardb@xxxxxxxxxx>, Alexander Graf <graf@xxxxxxxxxx>
Subject: Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs
From: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Date: Fri, 25 Feb 2022 19:39:30 +0100
Cc: ACPI Devel Maling List <linux-acpi@xxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Len Brown <lenb@xxxxxxxxxx>, "Rafael J. Wysocki" <rafael@xxxxxxxxxx>, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>, "Woodhouse, David" <dwmw@xxxxxxxxxxxx>
In-reply-to: <YhkaAUQ/5ChlKlXt@zx2c4.com>
References: <20220225155552.30636-1-graf@amazon.com> <CAMj1kXGtANm3SMoREymDSyx+wpn3L=Ex5q5mpgQigOwmEp33Lg@mail.gmail.com> <YhkQKfE8ErtFBmSB@zx2c4.com> <CAMj1kXEtUUod8Hp6VhS6k7iDKYkFj_t_J=qS2XF1p2X_SFdTvg@mail.gmail.com> <CAHmME9oJpL_y4bDaLwrZZZ54p5_C0YF9=vW7Zz1iUhpBHx2TvA@mail.gmail.com> <YhkaAUQ/5ChlKlXt@zx2c4.com>

Okay, the final piece, userspace:

/sys/bus/acpi/devices/QEMUVGID:00/modalias gives:
    acpi:QEMUVGID:VM_GEN_COUNTER:

modinfo -F alias vmgenid.ko gives:
    acpi*:VM_GEN_COUNTER:*

udev src uses fnmatch.

Bash confirms a match:

$ [[ "acpi:QEMUVGID:VM_GEN_COUNTER:" == acpi*:VM_GEN_COUNTER:* ]] &&
echo matches
matches

So I think with ACPI_ID_LEN --> 16 we are good to go.

Jason

Follow-Ups:
- Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs
  - From: Alexander Graf

References:
- [PATCH] ACPI: bus: Match first 9 bytes of device IDs
  - From: Alexander Graf
- Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs
  - From: Ard Biesheuvel
- Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs
  - From: Jason A. Donenfeld
- Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs
  - From: Ard Biesheuvel
- Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs
  - From: Jason A. Donenfeld
- Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs
  - From: Jason A. Donenfeld

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