linux-kernel - Re: [PATCH] ACPI / device_sysfs: Prefer "compatible" modalias

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Message-ID: <CAJZ5v0j6Y-cbqs6sAz-bxaHPpBsu95gFnuGQJyoqgXNpfEOfcw@mail.gmail.com>
Date:   Mon, 25 Jan 2021 17:08:55 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        AceLan Kao <acelan.kao@...onical.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        "open list:ACPI" <linux-acpi@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ACPI / device_sysfs: Prefer "compatible" modalias

On Fri, Jan 22, 2021 at 2:06 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Fri, Jan 22, 2021 at 08:53:02PM +0800, Kai-Heng Feng wrote:
> > Commit 8765c5ba1949 ("ACPI / scan: Rework modalias creation when
> > "compatible" is present") may create two "MODALIAS=" in uevent file if
> > conditions are met.
> >
> > This breaks systemd-udevd, which assumes each "key" in uevent file is
> > unique. The internal implementation of systemd-udevd overwrites the
> > first MODALIAS with the second one, so its kmod rule doesn't load driver
> > for the first MODALIAS.
> >
> > So if both ACPI modalias and OF modalias are present, use the latter
> > one to ensure there's only one MODALIAS.
> >
> > Reference: https://github.com/systemd/systemd/pull/18163
> > Cc: AceLan Kao <acelan.kao@...onical.com>
> > Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > Suggested-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> > Fixes: 8765c5ba1949 ("ACPI / scan: Rework modalias creation when "compatible" is present")
> > Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> > ---
> >  drivers/acpi/device_sysfs.c | 20 ++++++--------------
> >  1 file changed, 6 insertions(+), 14 deletions(-)
>
> Thanks for fixing this up!
>
> Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Applied as 5.11-rc material with some minor edits in the subject and
changelog and with the tags.

Thanks everyone!