static int qcom_ipcc_setup_mbox()

in qcom-ipcc.c [206:255]

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

static int qcom_ipcc_setup_mbox(struct qcom_ipcc *ipcc,
				struct device_node *controller_dn)
{
	struct of_phandle_args curr_ph;
	struct device_node *client_dn;
	struct mbox_controller *mbox;
	struct device *dev = ipcc->dev;
	int i, j, ret;

	/*
	 * Find out the number of clients interested in this mailbox
	 * and create channels accordingly.
	 */
	ipcc->num_chans = 0;
	for_each_node_with_property(client_dn, "mboxes") {
		if (!of_device_is_available(client_dn))
			continue;
		i = of_count_phandle_with_args(client_dn,
						"mboxes", "#mbox-cells");
		for (j = 0; j < i; j++) {
			ret = of_parse_phandle_with_args(client_dn, "mboxes",
						"#mbox-cells", j, &curr_ph);
			of_node_put(curr_ph.np);
			if (!ret && curr_ph.np == controller_dn) {
				ipcc->num_chans++;
				break;
			}
		}
	}

	/* If no clients are found, skip registering as a mbox controller */
	if (!ipcc->num_chans)
		return 0;

	ipcc->chans = devm_kcalloc(dev, ipcc->num_chans,
					sizeof(struct mbox_chan), GFP_KERNEL);
	if (!ipcc->chans)
		return -ENOMEM;

	mbox = &ipcc->mbox;
	mbox->dev = dev;
	mbox->num_chans = ipcc->num_chans;
	mbox->chans = ipcc->chans;
	mbox->ops = &ipcc_mbox_chan_ops;
	mbox->of_xlate = qcom_ipcc_mbox_xlate;
	mbox->txdone_irq = false;
	mbox->txdone_poll = false;

	return devm_mbox_controller_register(dev, mbox);
}