int sdw_slave_add()

in slave.c [24:90]

• 50 lines of code
• 5 McCabe index (conditional complexity)

int sdw_slave_add(struct sdw_bus *bus,
		  struct sdw_slave_id *id, struct fwnode_handle *fwnode)
{
	struct sdw_slave *slave;
	int ret;
	int i;

	slave = kzalloc(sizeof(*slave), GFP_KERNEL);
	if (!slave)
		return -ENOMEM;

	/* Initialize data structure */
	memcpy(&slave->id, id, sizeof(*id));
	slave->dev.parent = bus->dev;
	slave->dev.fwnode = fwnode;

	if (id->unique_id == SDW_IGNORED_UNIQUE_ID) {
		/* name shall be sdw:link:mfg:part:class */
		dev_set_name(&slave->dev, "sdw:%01x:%04x:%04x:%02x",
			     bus->link_id, id->mfg_id, id->part_id,
			     id->class_id);
	} else {
		/* name shall be sdw:link:mfg:part:class:unique */
		dev_set_name(&slave->dev, "sdw:%01x:%04x:%04x:%02x:%01x",
			     bus->link_id, id->mfg_id, id->part_id,
			     id->class_id, id->unique_id);
	}

	slave->dev.bus = &sdw_bus_type;
	slave->dev.of_node = of_node_get(to_of_node(fwnode));
	slave->dev.type = &sdw_slave_type;
	slave->dev.groups = sdw_slave_status_attr_groups;
	slave->bus = bus;
	slave->status = SDW_SLAVE_UNATTACHED;
	init_completion(&slave->enumeration_complete);
	init_completion(&slave->initialization_complete);
	slave->dev_num = 0;
	init_completion(&slave->probe_complete);
	slave->probed = false;
	slave->first_interrupt_done = false;

	for (i = 0; i < SDW_MAX_PORTS; i++)
		init_completion(&slave->port_ready[i]);

	mutex_lock(&bus->bus_lock);
	list_add_tail(&slave->node, &bus->slaves);
	mutex_unlock(&bus->bus_lock);

	ret = device_register(&slave->dev);
	if (ret) {
		dev_err(bus->dev, "Failed to add slave: ret %d\n", ret);

		/*
		 * On err, don't free but drop ref as this will be freed
		 * when release method is invoked.
		 */
		mutex_lock(&bus->bus_lock);
		list_del(&slave->node);
		mutex_unlock(&bus->bus_lock);
		put_device(&slave->dev);

		return ret;
	}
	sdw_slave_debugfs_init(slave);

	return ret;
}