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

Bjorn Helgaas
2025-10-28T22:48:00Z

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@linux.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")