linux-kernel - Re: [PATCH v2] drm/bridge: Fix assignment of the of

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: <ZyOvvxUQjUdfSX25@hovoldconsulting.com>
Date: Thu, 31 Oct 2024 17:26:39 +0100
From: Johan Hovold <johan@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Abel Vesa <abel.vesa@...aro.org>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH v2] drm/bridge: Fix assignment of the of_node of the
 parent to aux bridge

On Thu, Oct 31, 2024 at 05:48:24PM +0200, Dmitry Baryshkov wrote:
> On Mon, 21 Oct 2024 at 10:23, Johan Hovold <johan@...nel.org> wrote:
> >
> > On Fri, Oct 18, 2024 at 03:49:34PM +0300, Abel Vesa wrote:
> > > The assignment of the of_node to the aux bridge needs to mark the
> > > of_node as reused as well, otherwise resource providers like pinctrl will
> > > report a gpio as already requested by a different device when both pinconf
> > > and gpios property are present.
> >
> > I don't think you need a gpio property for that to happen, right? And
> > this causes probe to fail IIRC?
> 
> No, just having a pinctrl property in the bridge device is enough.
> Without this fix when the aux subdevice is being bound to the driver,
> the pinctrl_bind_pins() will attempt to bind pins, which are already
> in use by the actual bridge device.

Right, and IIRC it then fails to probe as well. This is information that
should have been in the commit message.

Johan