static int mercury_cfg_write()

in lba_pci.c [512:540]

• 24 lines of code
• 7 McCabe index (conditional complexity)

static int mercury_cfg_write(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 data)
{
	struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
	void __iomem *data_reg = d->hba.base_addr + LBA_PCI_CFG_DATA;
	u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
	u32 tok = LBA_CFG_TOK(local_bus,devfn);

	if ((pos > 255) || (devfn > 255))
		return -EINVAL;

	DBG_CFG("%s(%x+%2x) <- 0x%x (c)\n", __func__, tok, pos, data);

	LBA_CFG_TR4_ADDR_SETUP(d, tok | pos);
	switch(size) {
	case 1:
		WRITE_REG8 (data, data_reg + (pos & 3));
		break;
	case 2:
		WRITE_REG16(data, data_reg + (pos & 2));
		break;
	case 4:
		WRITE_REG32(data, data_reg);
		break;
	}

	/* flush posted write */
	lba_t32 = READ_U32(d->hba.base_addr + LBA_PCI_CFG_ADDR);
	return 0;
}