static int qcom_smd_parse_edge()

in qcom_smd.c [1336:1430]

• 77 lines of code
• 11 McCabe index (conditional complexity)

static int qcom_smd_parse_edge(struct device *dev,
			       struct device_node *node,
			       struct qcom_smd_edge *edge)
{
	struct device_node *syscon_np;
	const char *key;
	int irq;
	int ret;

	INIT_LIST_HEAD(&edge->channels);
	spin_lock_init(&edge->channels_lock);

	INIT_WORK(&edge->scan_work, qcom_channel_scan_worker);
	INIT_WORK(&edge->state_work, qcom_channel_state_worker);

	edge->of_node = of_node_get(node);

	key = "qcom,smd-edge";
	ret = of_property_read_u32(node, key, &edge->edge_id);
	if (ret) {
		dev_err(dev, "edge missing %s property\n", key);
		goto put_node;
	}

	edge->remote_pid = QCOM_SMEM_HOST_ANY;
	key = "qcom,remote-pid";
	of_property_read_u32(node, key, &edge->remote_pid);

	edge->mbox_client.dev = dev;
	edge->mbox_client.knows_txdone = true;
	edge->mbox_chan = mbox_request_channel(&edge->mbox_client, 0);
	if (IS_ERR(edge->mbox_chan)) {
		if (PTR_ERR(edge->mbox_chan) != -ENODEV) {
			ret = PTR_ERR(edge->mbox_chan);
			goto put_node;
		}

		edge->mbox_chan = NULL;

		syscon_np = of_parse_phandle(node, "qcom,ipc", 0);
		if (!syscon_np) {
			dev_err(dev, "no qcom,ipc node\n");
			ret = -ENODEV;
			goto put_node;
		}

		edge->ipc_regmap = syscon_node_to_regmap(syscon_np);
		if (IS_ERR(edge->ipc_regmap)) {
			ret = PTR_ERR(edge->ipc_regmap);
			goto put_node;
		}

		key = "qcom,ipc";
		ret = of_property_read_u32_index(node, key, 1, &edge->ipc_offset);
		if (ret < 0) {
			dev_err(dev, "no offset in %s\n", key);
			goto put_node;
		}

		ret = of_property_read_u32_index(node, key, 2, &edge->ipc_bit);
		if (ret < 0) {
			dev_err(dev, "no bit in %s\n", key);
			goto put_node;
		}
	}

	ret = of_property_read_string(node, "label", &edge->name);
	if (ret < 0)
		edge->name = node->name;

	irq = irq_of_parse_and_map(node, 0);
	if (irq < 0) {
		dev_err(dev, "required smd interrupt missing\n");
		ret = irq;
		goto put_node;
	}

	ret = devm_request_irq(dev, irq,
			       qcom_smd_edge_intr, IRQF_TRIGGER_RISING,
			       node->name, edge);
	if (ret) {
		dev_err(dev, "failed to request smd irq\n");
		goto put_node;
	}

	edge->irq = irq;

	return 0;

put_node:
	of_node_put(node);
	edge->of_node = NULL;

	return ret;
}