static int dino_cfg_read()

in dino.c [172:199]

• 22 lines of code
• 5 McCabe index (conditional complexity)

static int dino_cfg_read(struct pci_bus *bus, unsigned int devfn, int where,
		int size, u32 *val)
{
	struct dino_device *d = DINO_DEV(parisc_walk_tree(bus->bridge));
	u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
	u32 v = DINO_CFG_TOK(local_bus, devfn, where & ~3);
	void __iomem *base_addr = d->hba.base_addr;
	unsigned long flags;

	DBG("%s: %p, %d, %d, %d\n", __func__, base_addr, devfn, where,
									size);
	spin_lock_irqsave(&d->dinosaur_pen, flags);

	/* tell HW which CFG address */
	__raw_writel(v, base_addr + DINO_PCI_ADDR);

	/* generate cfg read cycle */
	if (size == 1) {
		*val = readb(base_addr + DINO_CONFIG_DATA + (where & 3));
	} else if (size == 2) {
		*val = readw(base_addr + DINO_CONFIG_DATA + (where & 2));
	} else if (size == 4) {
		*val = readl(base_addr + DINO_CONFIG_DATA);
	}

	spin_unlock_irqrestore(&d->dinosaur_pen, flags);
	return 0;
}