pci: Simplify pci_bus_is_root()
pci_bus_is_root() currently relies on a method in the PCIBusClass. But it's always known if a PCI bus is a root bus when we create it, so using a dynamic method is overkill. This replaces it with an IS_ROOT bit in a new flags field, which is set on root buses and otherwise clear. As a bonus this removes the special is_root logic from pci_expander_bridge, since it already creates its bus as a root bus. Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au> Reviewed-by: NMarcel Apfelbaum <marcel@redhat.com> Reviewed-by: NPeter Xu <peterx@redhat.com> Reviewed-by: NGreg Kurz <groug@kaod.org> Message-Id: <20190424041959.4087-3-david@gibson.dropbear.id.au>
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