static int nvme_identify_ns_descs()

in host/core.c [1398:1450]

• 43 lines of code
• 11 McCabe index (conditional complexity)

static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
		struct nvme_ns_ids *ids)
{
	struct nvme_command c = { };
	bool csi_seen = false;
	int status, pos, len;
	void *data;

	if (ctrl->vs < NVME_VS(1, 3, 0) && !nvme_multi_css(ctrl))
		return 0;
	if (ctrl->quirks & NVME_QUIRK_NO_NS_DESC_LIST)
		return 0;

	c.identify.opcode = nvme_admin_identify;
	c.identify.nsid = cpu_to_le32(nsid);
	c.identify.cns = NVME_ID_CNS_NS_DESC_LIST;

	data = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
				      NVME_IDENTIFY_DATA_SIZE);
	if (status) {
		dev_warn(ctrl->device,
			"Identify Descriptors failed (nsid=%u, status=0x%x)\n",
			nsid, status);
		goto free_data;
	}

	for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) {
		struct nvme_ns_id_desc *cur = data + pos;

		if (cur->nidl == 0)
			break;

		len = nvme_process_ns_desc(ctrl, ids, cur, &csi_seen);
		if (len < 0)
			break;

		len += sizeof(*cur);
	}

	if (nvme_multi_css(ctrl) && !csi_seen) {
		dev_warn(ctrl->device, "Command set not reported for nsid:%d\n",
			 nsid);
		status = -EINVAL;
	}

free_data:
	kfree(data);
	return status;
}