linux-kernel - Re: [PATCH 1/9] PCI: Prevent resource tree corruption when BAR resize fails

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Message-ID: <20251029233644.GA1604285@bhelgaas>
Date: Wed, 29 Oct 2025 18:36:44 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Alex Bennée <alex.bennee@...aro.org>,
	Simon Richter <Simon.Richter@...yros.de>,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	Alex Deucher <alexander.deucher@....com>,
	amd-gfx@...ts.freedesktop.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	David Airlie <airlied@...il.com>, dri-devel@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	linux-pci@...r.kernel.org, Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Simona Vetter <simona@...ll.ch>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	Christian König <christian.koenig@....com>,
	Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
	Michał Winiarski <michal.winiarski@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/9] PCI: Prevent resource tree corruption when BAR
 resize fails

On Tue, Oct 28, 2025 at 07:35:43PM +0200, Ilpo Järvinen wrote:
> pbus_reassign_bridge_resources() saves bridge windows into the saved
> list before attempting to adjust resource assignments to perform a BAR
> resize operation. If resource adjustments cannot be completed fully,
> rollback is attempted by restoring the resource from the saved list.

> Fixes: 8bb705e3e79d ("PCI: Add pci_resize_resource() for resizing BARs")
> Reported-by: Simon Richter <Simon.Richter@...yros.de>
> Reported-by: Alex Bennée <alex.bennee@...aro.org>

If these reports were public, can we include lore URLs for them?

Same question for [PATCH 5/9] PCI: Fix restoring BARs on BAR resize
rollback path.

I put these all on pci/resource for build testing.  I assume we'll
tweak these based on testing reports and sorting out the pci/rebar
conflicts.

Bjorn