int nvme_init_ctrl()

in host/core.c [4458:4539]

• 69 lines of code
• 6 McCabe index (conditional complexity)

int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
		const struct nvme_ctrl_ops *ops, unsigned long quirks)
{
	int ret;

	ctrl->state = NVME_CTRL_NEW;
	clear_bit(NVME_CTRL_FAILFAST_EXPIRED, &ctrl->flags);
	spin_lock_init(&ctrl->lock);
	mutex_init(&ctrl->scan_lock);
	INIT_LIST_HEAD(&ctrl->namespaces);
	xa_init(&ctrl->cels);
	init_rwsem(&ctrl->namespaces_rwsem);
	ctrl->dev = dev;
	ctrl->ops = ops;
	ctrl->quirks = quirks;
	ctrl->numa_node = NUMA_NO_NODE;
	INIT_WORK(&ctrl->scan_work, nvme_scan_work);
	INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
	INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
	INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work);
	init_waitqueue_head(&ctrl->state_wq);

	INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work);
	INIT_DELAYED_WORK(&ctrl->failfast_work, nvme_failfast_work);
	memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd));
	ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive;

	BUILD_BUG_ON(NVME_DSM_MAX_RANGES * sizeof(struct nvme_dsm_range) >
			PAGE_SIZE);
	ctrl->discard_page = alloc_page(GFP_KERNEL);
	if (!ctrl->discard_page) {
		ret = -ENOMEM;
		goto out;
	}

	ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL);
	if (ret < 0)
		goto out;
	ctrl->instance = ret;

	device_initialize(&ctrl->ctrl_device);
	ctrl->device = &ctrl->ctrl_device;
	ctrl->device->devt = MKDEV(MAJOR(nvme_ctrl_base_chr_devt),
			ctrl->instance);
	ctrl->device->class = nvme_class;
	ctrl->device->parent = ctrl->dev;
	ctrl->device->groups = nvme_dev_attr_groups;
	ctrl->device->release = nvme_free_ctrl;
	dev_set_drvdata(ctrl->device, ctrl);
	ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance);
	if (ret)
		goto out_release_instance;

	nvme_get_ctrl(ctrl);
	cdev_init(&ctrl->cdev, &nvme_dev_fops);
	ctrl->cdev.owner = ops->module;
	ret = cdev_device_add(&ctrl->cdev, ctrl->device);
	if (ret)
		goto out_free_name;

	/*
	 * Initialize latency tolerance controls.  The sysfs files won't
	 * be visible to userspace unless the device actually supports APST.
	 */
	ctrl->device->power.set_latency_tolerance = nvme_set_latency_tolerance;
	dev_pm_qos_update_user_latency_tolerance(ctrl->device,
		min(default_ps_max_latency_us, (unsigned long)S32_MAX));

	nvme_fault_inject_init(&ctrl->fault_inject, dev_name(ctrl->device));
	nvme_mpath_init_ctrl(ctrl);

	return 0;
out_free_name:
	nvme_put_ctrl(ctrl);
	kfree_const(ctrl->device->kobj.name);
out_release_instance:
	ida_simple_remove(&nvme_instance_ida, ctrl->instance);
out:
	if (ctrl->discard_page)
		__free_page(ctrl->discard_page);
	return ret;
}