linux-kernel - RE: Bug report: the extended PCI config space is missed with 6.2-rc2

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Date:   Thu, 5 Jan 2023 21:49:44 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
CC:     "Williams, Dan J" <dan.j.williams@...el.com>,
        "Liang, Kan" <kan.liang@...ux.intel.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "kernelorg@...ead.fr" <kernelorg@...ead.fr>,
        "kjhambrick@...il.com" <kjhambrick@...il.com>,
        "2lprbe78@...k.com" <2lprbe78@...k.com>,
        "nicholas.johnson-opensource@...look.com.au" 
        <nicholas.johnson-opensource@...look.com.au>,
        "benoitg@...us.ca" <benoitg@...us.ca>,
        "mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>,
        "wse@...edocomputers.com" <wse@...edocomputers.com>,
        "mumblingdrunkard@...tonmail.com" <mumblingdrunkard@...tonmail.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Box, David E" <david.e.box@...el.com>,
        "Sun, Yunying" <yunying.sun@...el.com>
Subject: RE: Bug report: the extended PCI config space is missed with 6.2-rc2

> The EDAC driver wouldn't have any ACPI stuff in it; it's just that
> Linux is looking for ACPI info about the ECAM area.

Is there some way for a driver to know that pci_read_config_dword()
is going to fail for offsets in extended PCIe config space?

-Tony