linux-kernel - Re: Fwd: sysfs: cannot create duplicate filename .../system76_acpi::kbd

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Message-ID: <b9d4ab02-fe49-48ab-bf74-0c7a578e891a@leemhuis.info>
Date:   Tue, 21 Nov 2023 10:19:03 +0100
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     Takashi Iwai <tiwai@...e.de>,
        Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Cc:     Bagas Sanjaya <bagasdotme@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux LEDs <linux-leds@...r.kernel.org>,
        Tim Crawford <tcrawford@...tem76.com>,
        Jeremy Soller <jeremy@...tem76.com>,
        System76 Product Development <productdev@...tem76.com>,
        Lee Jones <lee@...nel.org>, Pavel Machek <pavel@....cz>,
        Johannes Penßel <johannes.penssel@...il.com>
Subject: Re: Fwd: sysfs: cannot create duplicate filename
 .../system76_acpi::kbd_backlight/color

Takashi, Jean-Jacques Hiblot, Lee,

On 20.11.23 14:53, Takashi Iwai wrote:
> On Mon, 06 Nov 2023 14:19:08 +0100,
> Bagas Sanjaya wrote:
>> On Sat, Nov 04, 2023 at 01:01:56PM +0100, Jean-Jacques Hiblot wrote:
>>> On 29/10/2023 02:48, Bagas Sanjaya wrote:
>>>> On Thu, Oct 26, 2023 at 02:55:06PM +0700, Bagas Sanjaya wrote:
>>>>> The culprit seems to be commit c7d80059b086c4986cd994a1973ec7a5d75f8eea, which introduces a new 'color' attribute for led sysfs class devices. The problem is that the system76-acpi platform driver tries to create the exact same sysfs attribute itself for the system76_acpi::kbd_backlight device, leading to the conflict. For testing purposes, I've just rebuilt the kernel with the system76-apci color attribute renamed to kb_color, and that fixes the issue.
>>>>
>>>> Jean-Jacques Hiblot, would you like to take a look on this regression,
>>>> since you authored the culprit?
>
>>> The offending commit stores the color in struct led_classdev and exposes it
>>> via sysfs. It was part of a series that create a RGB leds from multiple
>>> single-color LEDs. for this series, we need the color information but we
>>> don't really need to expose it it via sysfs. In order to fix the issue, we
>>> can remove the 'color' attribute from the sysfs.
>>
>> OK, see you in the patch!
> 
> Is there a patch available?

Not that I know of. Could not find anything on lore either.

> This bug hits for a few Logitech keyboard models, too, and it makes
> 6.6 kernel unsable for them, as hid-lg-g15 driver probe fails due to
> this bug:
>   https://bugzilla.kernel.org/show_bug.cgi?id=218155
> 
> We need a quick fix for 6.6.x.

Given that Jean-Jacques Hiblot (the author of the culprit) and Lee (who
committed it and sent it to Linus) know about this for a while already
without doing anything about it, I wonder if someone should just send a
revert to Linus (unless of course that is likely to introduce a
regression on its own).

Takashi, could you maybe do this, unless a fix shows up real soon?

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: /me should have followed up on this earlier... :-/
--
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