Scan a pci slot on a bus for devices.
int pci_scan_slot(struct pci_bus * bus, int devfn);
bus
PCI bus to scan
devfn
slot number to scan (must have zero function.)
Scan a PCI slot on the specified PCI bus for devices, adding discovered devices to the bus->devices list. New devices will not have is_added set.
Returns the number of new devices found.