/* * acpi_pcidev_scan: * * Scan the ACPI device tree for PCI devices. A node is detected as a * PCI device if it has an ancestor that is a PCI root bridge and such * that all intermediate nodes are PCI-to-PCI bridges. Depth-first * recursive implementation. * * PCI root bridges do not necessarily contain an _ADR, since they already * contain an _HID (ACPI 4.0a, p. 197). However we require an _ADR for * all non-root PCI devices. */