return find_bus_among_children(dn->phb->bus, dn); 
return find_bus_among_children(pdn->phb->bus, dn); 
struct pci_bus *rpaphp_find_pci_bus(struct device_node *dn){	if (!dn->phb || !dn->phb->bus)		return NULL;	return find_bus_among_children(dn->phb->bus, dn);}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/1635317facea3094ddf34082cd86797efb1d9f7e/rpaphp_pci.c/buggy/drivers/pci/hotplug/rpaphp_pci.c