linux-kernel - Re: [PATCH 1/2] PCI: Setup bridge resources earlier

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Message-ID: <20251028224758.GA1539235@bhelgaas>
Date: Tue, 28 Oct 2025 17:47:58 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Val Packett <val@...kett.cool>
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Wilczyński <kw@...ux.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-kernel@...r.kernel.org,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	Guenter Roeck <linux@...ck-us.net>, regressions@...ts.linux.dev
Subject: Re: [PATCH 1/2] PCI: Setup bridge resources earlier

On Mon, Oct 13, 2025 at 04:01:16PM -0500, Bjorn Helgaas wrote:
> On Mon, Oct 06, 2025 at 05:00:25AM -0300, Val Packett wrote:
> > On 9/24/25 10:42 AM, Ilpo Järvinen wrote:
> > > Bridge windows are read twice from PCI Config Space, the first read is
> > > made from pci_read_bridge_windows() which does not setup the device's
> > > resources. It causes problems down the road as child resources of the
> > > bridge cannot check whether they reside within the bridge window or
> > > not.
> > > 
> > > Setup the bridge windows already in pci_read_bridge_windows().
> > > 
> > > Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> > 
> > Looks like this change has broken the WiFi (but not NVMe) on my Snapdragon
> > X1E laptop (Latitude 7455):
> ...

> #regzbot introduced: a43ac325c7cb ("PCI: Set up bridge resources earlier")
#regzbot fix: 469276c06aff ("PCI: Revert early bridge resource set up")