int ne_do_request()

in drivers/virt/nitro_enclaves/ne_pci_dev.c [99:177]
52 lines of code
8 McCabe index (conditional complexity)

int ne_do_request(struct pci_dev *pdev, enum ne_pci_dev_cmd_type cmd_type,
		  void *cmd_request, size_t cmd_request_size,
		  struct ne_pci_dev_cmd_reply *cmd_reply, size_t cmd_reply_size)
{
	struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev);
	int rc = -EINVAL;

	if (cmd_type <= INVALID_CMD || cmd_type >= MAX_CMD) {
		dev_err_ratelimited(&pdev->dev, "Invalid cmd type=%u\n", cmd_type);

		return -EINVAL;
	}

	if (!cmd_request) {
		dev_err_ratelimited(&pdev->dev, "Null cmd request for cmd type=%u\n",
				    cmd_type);

		return -EINVAL;
	}

	if (cmd_request_size > NE_SEND_DATA_SIZE) {
		dev_err_ratelimited(&pdev->dev, "Invalid req size=%zu for cmd type=%u\n",
				    cmd_request_size, cmd_type);

		return -EINVAL;
	}

	if (!cmd_reply) {
		dev_err_ratelimited(&pdev->dev, "Null cmd reply for cmd type=%u\n",
				    cmd_type);

		return -EINVAL;
	}

	if (cmd_reply_size > NE_RECV_DATA_SIZE) {
		dev_err_ratelimited(&pdev->dev, "Invalid reply size=%zu for cmd type=%u\n",
				    cmd_reply_size, cmd_type);

		return -EINVAL;
	}

	/*
	 * Use this mutex so that the PCI device handles one command request at
	 * a time.
	 */
	mutex_lock(&ne_pci_dev->pci_dev_mutex);

	atomic_set(&ne_pci_dev->cmd_reply_avail, 0);

	ne_submit_request(pdev, cmd_type, cmd_request, cmd_request_size);

	rc = ne_wait_for_reply(pdev);
	if (rc < 0) {
		dev_err_ratelimited(&pdev->dev, "Error in wait for reply for cmd type=%u [rc=%d]\n",
				    cmd_type, rc);

		goto unlock_mutex;
	}

	ne_retrieve_reply(pdev, cmd_reply, cmd_reply_size);

	atomic_set(&ne_pci_dev->cmd_reply_avail, 0);

	if (cmd_reply->rc < 0) {
		rc = cmd_reply->rc;

		dev_err_ratelimited(&pdev->dev, "Error in cmd process logic, cmd type=%u [rc=%d]\n",
				    cmd_type, rc);

		goto unlock_mutex;
	}

	rc = 0;

unlock_mutex:
	mutex_unlock(&ne_pci_dev->pci_dev_mutex);

	return rc;
}