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

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Date:   Fri, 22 Jan 2021 14:06:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     rjw@...ysocki.net, AceLan Kao <acelan.kao@...onical.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...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 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>