linux-kernel - Re: [PATCH v2 00/11] gpio: Adopt revocable mechanism for UAF prevention

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Message-ID: <CAMRc=McKJmiWz-1o6qHbOva70J_SAdFwxngGFta31DDy5vU=Dg@mail.gmail.com>
Date: Tue, 3 Feb 2026 12:15:51 +0100
From: Bartosz Golaszewski <brgl@...nel.org>
To: Tzung-Bi Shih <tzungbi@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Danilo Krummrich <dakr@...nel.org>, Linus Walleij <linusw@...nel.org>, Jonathan Corbet <corbet@....net>, 
	Shuah Khan <shuah@...nel.org>, Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
	Wolfram Sang <wsa+renesas@...g-engineering.com>, Jason Gunthorpe <jgg@...dia.com>, 
	Johan Hovold <johan@...nel.org>, linux-kernel@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, chrome-platform@...ts.linux.dev, 
	Dan Williams <dan.j.williams@...el.com>, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2 00/11] gpio: Adopt revocable mechanism for UAF prevention

On Tue, Feb 3, 2026 at 7:11 AM Tzung-Bi Shih <tzungbi@...nel.org> wrote:
>
> This series transitions the UAF prevention logic within the GPIO core
> (gpiolib) to use the 'revocable' mechanism.
>
> The existing code aims to prevent UAF issues when the underlying GPIO
> chip is removed.  This series replaces that custom logic with the
> generic 'revocable' API, which is designed to handle such lifecycle
> dependencies.  There should be no changes in behavior.
>
> The series applies after:
> - https://lore.kernel.org/all/20260129143733.45618-1-tzungbi@kernel.org
> - https://lore.kernel.org/all/20260203060210.972243-1-tzungbi@kernel.org
>
> Bartosz: the series was planned to send after -rc1 comes.  But I think
> it'd be great to send out for your early review and testing if possible.
> The series base on v6.19-rc8, driver-core-next, and gpio/for-next.
> Please use the temporary integration testing branch
> https://git.kernel.org/pub/scm/linux/kernel/git/tzungbi/chrome-platform.git/log/?h=gpio_rev
> if you'd like to.
>

This is not a Reviewed-by yet but FWIW:

Tested-by: Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>

With this revision there's no impact on stability or performance and I
haven't seen any KASAN splats or kmemleak reports.

I'll try to review all the patches individually.

Bartosz