static int nvme_probe()

in host/pci.c [3049:3139]

• 67 lines of code
• 10 McCabe index (conditional complexity)

static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	int node, result = -ENOMEM;
	struct nvme_dev *dev;
	unsigned long quirks = id->driver_data;
	size_t alloc_size;

	node = dev_to_node(&pdev->dev);
	if (node == NUMA_NO_NODE)
		set_dev_node(&pdev->dev, first_memory_node);

	dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node);
	if (!dev)
		return -ENOMEM;

	dev->nr_write_queues = write_queues;
	dev->nr_poll_queues = poll_queues;
	dev->nr_allocated_queues = nvme_max_io_queues(dev) + 1;
	dev->queues = kcalloc_node(dev->nr_allocated_queues,
			sizeof(struct nvme_queue), GFP_KERNEL, node);
	if (!dev->queues)
		goto free;

	dev->dev = get_device(&pdev->dev);
	pci_set_drvdata(pdev, dev);

	result = nvme_dev_map(dev);
	if (result)
		goto put_pci;

	INIT_WORK(&dev->ctrl.reset_work, nvme_reset_work);
	INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work);
	mutex_init(&dev->shutdown_lock);

	result = nvme_setup_prp_pools(dev);
	if (result)
		goto unmap;

	quirks |= check_vendor_combination_bug(pdev);

	if (!noacpi && acpi_storage_d3(&pdev->dev)) {
		/*
		 * Some systems use a bios work around to ask for D3 on
		 * platforms that support kernel managed suspend.
		 */
		dev_info(&pdev->dev,
			 "platform quirk: setting simple suspend\n");
		quirks |= NVME_QUIRK_SIMPLE_SUSPEND;
	}

	/*
	 * Double check that our mempool alloc size will cover the biggest
	 * command we support.
	 */
	alloc_size = nvme_pci_iod_alloc_size();
	WARN_ON_ONCE(alloc_size > PAGE_SIZE);

	dev->iod_mempool = mempool_create_node(1, mempool_kmalloc,
						mempool_kfree,
						(void *) alloc_size,
						GFP_KERNEL, node);
	if (!dev->iod_mempool) {
		result = -ENOMEM;
		goto release_pools;
	}

	result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops,
			quirks);
	if (result)
		goto release_mempool;

	dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev));

	nvme_reset_ctrl(&dev->ctrl);
	async_schedule(nvme_async_probe, dev);

	return 0;

 release_mempool:
	mempool_destroy(dev->iod_mempool);
 release_pools:
	nvme_release_prp_pools(dev);
 unmap:
	nvme_dev_unmap(dev);
 put_pci:
	put_device(dev->dev);
 free:
	kfree(dev->queues);
	kfree(dev);
	return result;
}