linux-kernel - Re: [PATCH v2 4/9] gpio: sysfs: don't use driver data in sysfs callbacks for line attributes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CACRpkdan+5xY6RUbGb1r8OmaB3-xSj_MGGq0oONevqBGay8NYg@mail.gmail.com>
Date: Tue, 24 Jun 2025 21:33:36 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Ahmad Fatoum <a.fatoum@...gutronix.de>, Kent Gibson <warthog618@...il.com>, 
	Jan Lübbe <jlu@...gutronix.de>, Marek Vasut <marex@...x.de>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v2 4/9] gpio: sysfs: don't use driver data in sysfs
 callbacks for line attributes

On Mon, Jun 23, 2025 at 11:00 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:

> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>
> Currently each exported GPIO is represented in sysfs as a separate class
> device. This allows us to simply use dev_get_drvdata() to retrieve the
> pointer passed to device_create_with_groups() from sysfs ops callbacks.
>
> However, we're preparing to add a parallel set of per-line sysfs
> attributes that will live inside the associated gpiochip group. They are
> not registered as class devices and so have the parent device passed as
> argument to their callbacks (the GPIO chip class device).
>
> Put the attribute structs inside the GPIO descriptor data and
> dereference the relevant ones using container_of() in the callbacks.
> This way, we'll be able to reuse the same code for both the legacy and
> new GPIO attributes.
>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij