static void __init build_device_resources()

in kernel/of_device_64.c [316:418]

• 80 lines of code
• 13 McCabe index (conditional complexity)

static void __init build_device_resources(struct platform_device *op,
					  struct device *parent)
{
	struct platform_device *p_op;
	struct of_bus *bus;
	int na, ns;
	int index, num_reg;
	const void *preg;

	if (!parent)
		return;

	p_op = to_platform_device(parent);
	bus = of_match_bus(p_op->dev.of_node);
	bus->count_cells(op->dev.of_node, &na, &ns);

	preg = of_get_property(op->dev.of_node, bus->addr_prop_name, &num_reg);
	if (!preg || num_reg == 0)
		return;

	/* Convert to num-cells.  */
	num_reg /= 4;

	/* Convert to num-entries.  */
	num_reg /= na + ns;

	/* Prevent overrunning the op->resources[] array.  */
	if (num_reg > PROMREG_MAX) {
		printk(KERN_WARNING "%pOF: Too many regs (%d), "
		       "limiting to %d.\n",
		       op->dev.of_node, num_reg, PROMREG_MAX);
		num_reg = PROMREG_MAX;
	}

	op->resource = op->archdata.resource;
	op->num_resources = num_reg;
	for (index = 0; index < num_reg; index++) {
		struct resource *r = &op->resource[index];
		u32 addr[OF_MAX_ADDR_CELLS];
		const u32 *reg = (preg + (index * ((na + ns) * 4)));
		struct device_node *dp = op->dev.of_node;
		struct device_node *pp = p_op->dev.of_node;
		struct of_bus *pbus, *dbus;
		u64 size, result = OF_BAD_ADDR;
		unsigned long flags;
		int dna, dns;
		int pna, pns;

		size = of_read_addr(reg + na, ns);
		memcpy(addr, reg, na * 4);

		flags = bus->get_flags(addr, 0);

		if (use_1to1_mapping(pp)) {
			result = of_read_addr(addr, na);
			goto build_res;
		}

		dna = na;
		dns = ns;
		dbus = bus;

		while (1) {
			dp = pp;
			pp = dp->parent;
			if (!pp) {
				result = of_read_addr(addr, dna);
				break;
			}

			pbus = of_match_bus(pp);
			pbus->count_cells(dp, &pna, &pns);

			if (build_one_resource(dp, dbus, pbus, addr,
					       dna, dns, pna))
				break;

			flags = pbus->get_flags(addr, flags);

			dna = pna;
			dns = pns;
			dbus = pbus;
		}

	build_res:
		memset(r, 0, sizeof(*r));

		if (of_resource_verbose)
			printk("%pOF reg[%d] -> %llx\n",
			       op->dev.of_node, index,
			       result);

		if (result != OF_BAD_ADDR) {
			if (tlb_type == hypervisor)
				result &= 0x0fffffffffffffffUL;

			r->start = result;
			r->end = result + size - 1;
			r->flags = flags;
		}
		r->name = op->dev.of_node->full_name;
	}
}