static int __init nvme_core_init()

in host/core.c [4740:4808]

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

static int __init nvme_core_init(void)
{
	int result = -ENOMEM;

	_nvme_check_size();

	nvme_wq = alloc_workqueue("nvme-wq",
			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!nvme_wq)
		goto out;

	nvme_reset_wq = alloc_workqueue("nvme-reset-wq",
			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!nvme_reset_wq)
		goto destroy_wq;

	nvme_delete_wq = alloc_workqueue("nvme-delete-wq",
			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!nvme_delete_wq)
		goto destroy_reset_wq;

	result = alloc_chrdev_region(&nvme_ctrl_base_chr_devt, 0,
			NVME_MINORS, "nvme");
	if (result < 0)
		goto destroy_delete_wq;

	nvme_class = class_create(THIS_MODULE, "nvme");
	if (IS_ERR(nvme_class)) {
		result = PTR_ERR(nvme_class);
		goto unregister_chrdev;
	}
	nvme_class->dev_uevent = nvme_class_uevent;

	nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem");
	if (IS_ERR(nvme_subsys_class)) {
		result = PTR_ERR(nvme_subsys_class);
		goto destroy_class;
	}

	result = alloc_chrdev_region(&nvme_ns_chr_devt, 0, NVME_MINORS,
				     "nvme-generic");
	if (result < 0)
		goto destroy_subsys_class;

	nvme_ns_chr_class = class_create(THIS_MODULE, "nvme-generic");
	if (IS_ERR(nvme_ns_chr_class)) {
		result = PTR_ERR(nvme_ns_chr_class);
		goto unregister_generic_ns;
	}

	return 0;

unregister_generic_ns:
	unregister_chrdev_region(nvme_ns_chr_devt, NVME_MINORS);
destroy_subsys_class:
	class_destroy(nvme_subsys_class);
destroy_class:
	class_destroy(nvme_class);
unregister_chrdev:
	unregister_chrdev_region(nvme_ctrl_base_chr_devt, NVME_MINORS);
destroy_delete_wq:
	destroy_workqueue(nvme_delete_wq);
destroy_reset_wq:
	destroy_workqueue(nvme_reset_wq);
destroy_wq:
	destroy_workqueue(nvme_wq);
out:
	return result;
}