int pci_legacy_read()

in kernel/pci-sysfs.c [326:348]

• 21 lines of code
• 6 McCabe index (conditional complexity)

int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
{
	struct pci_controller *hose = bus->sysdata;

	port += hose->io_space->start;

	switch(size) {
	case 1:
		*((u8 *)val) = inb(port);
		return 1;
	case 2:
		if (port & 1)
			return -EINVAL;
		*((u16 *)val) = inw(port);
		return 2;
	case 4:
		if (port & 3)
			return -EINVAL;
		*((u32 *)val) = inl(port);
		return 4;
	}
	return -EINVAL;
}