linux-kernel - Re: [PATCH 0/3] Revert "revocable: Revocable resource management"

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Message-ID: <aXt2XqRnBjb25f81@google.com>
Date: Thu, 29 Jan 2026 15:01:50 +0000
From: Tzung-Bi Shih <tzungbi@...nel.org>
To: Johan Hovold <johan@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>,
	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>,
	Simona Vetter <simona.vetter@...ll.ch>,
	Dan Williams <dan.j.williams@...el.com>,
	Jason Gunthorpe <jgg@...dia.com>, linux-doc@...r.kernel.org,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Revert "revocable: Revocable resource management"

On Tue, Jan 27, 2026 at 03:57:44PM +0000, Tzung-Bi Shih wrote:
> On Sat, Jan 24, 2026 at 06:05:32PM +0100, Johan Hovold wrote:
> > Turns out there are correctness issues with both the gpiolib conversion and
> > the revocable design itself that can lead to use-after-free and hung tasks (see
> > [1] and patch 3/3).
> [...]
> > Revert the revocable implementation until a redesign has been proposed and
> > evaluated properly.
> 
> I'll work on addressing the discovered issues and send follow-up fixes.  I
> believe keeping the current series in linux-next would be beneficial, as it
> allows for easier testing and wider evaluation by others, rather than
> reverting at this stage.

FWIW: https://lore.kernel.org/all/20260129143733.45618-2-tzungbi@kernel.org/
and https://lore.kernel.org/all/20260129143733.45618-4-tzungbi@kernel.org/
are the proposed fixes.