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Commit0d52f54e2e(PCI / ACPI: Make acpiphp ignore root bridges using PCIe native hotplug) added code that made the acpiphp driver completely ignore PCIe root complexes for which the kernel had been granted control of the native PCIe hotplug feature by the BIOS through _OSC. Unfortunately, however, this was a mistake, because on some systems there were PCI bridges supporting PCI (non-PCIe) hotplug under such root complexes and those bridges should have been handled by acpiphp. For this reason, revert the changes made by the commit mentioned above and make register_slot() in drivers/pci/hotplug/acpiphp_glue.c avoid registering hotplug slots for PCIe ports that belong to root complexes with native PCIe hotplug enabled (which means that the BIOS has granted the kernel control of this feature for the given root complex). This is reported to address the original issue fixed by commit0d52f54e2eand to work on the system where that commit broke things. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>