static int opromnext()

in char/openprom.c [185:230]

• 35 lines of code
• 9 McCabe index (conditional complexity)

static int opromnext(void __user *argp, unsigned int cmd, struct device_node *dp, struct openpromio *op, int bufsize, DATA *data)
{
	phandle ph;

	BUILD_BUG_ON(sizeof(phandle) != sizeof(int));

	if (bufsize < sizeof(phandle))
		return -EINVAL;

	ph = *((int *) op->oprom_array);
	if (ph) {
		dp = of_find_node_by_phandle(ph);
		if (!dp)
			return -EINVAL;

		switch (cmd) {
		case OPROMNEXT:
			dp = dp->sibling;
			break;

		case OPROMCHILD:
			dp = dp->child;
			break;

		case OPROMSETCUR:
		default:
			break;
		}
	} else {
		/* Sibling of node zero is the root node.  */
		if (cmd != OPROMNEXT)
			return -EINVAL;

		dp = of_find_node_by_path("/");
	}

	ph = 0;
	if (dp)
		ph = dp->phandle;

	data->current_node = dp;
	*((int *) op->oprom_array) = ph;
	op->oprom_size = sizeof(phandle);

	return copyout(argp, op, bufsize + sizeof(int));
}