struct pci_controller *phb = orig_dn->phb;  struct device_node *phb_dn;
struct device_node *fetch_dev_dn(struct pci_dev *dev){	struct device_node *orig_dn = dev->sysdata;	struct pci_controller *phb = orig_dn->phb; /* assume same phb as orig_dn */	struct device_node *phb_dn;	struct device_node *dn;	unsigned long searchval = (dev->bus->number << 8) | dev->devfn;	phb_dn = phb->arch_data;	dn = traverse_pci_devices(phb_dn, is_devfn_node, (void *)searchval);	if (dn)		dev->sysdata = dn;	return dn;}