static void version_resp()

in hv_balloon.c [1404:1463]

• 37 lines of code
• 5 McCabe index (conditional complexity)

static void version_resp(struct hv_dynmem_device *dm,
			struct dm_version_response *vresp)
{
	struct dm_version_request version_req;
	int ret;

	if (vresp->is_accepted) {
		/*
		 * We are done; wakeup the
		 * context waiting for version
		 * negotiation.
		 */
		complete(&dm->host_event);
		return;
	}
	/*
	 * If there are more versions to try, continue
	 * with negotiations; if not
	 * shutdown the service since we are not able
	 * to negotiate a suitable version number
	 * with the host.
	 */
	if (dm->next_version == 0)
		goto version_error;

	memset(&version_req, 0, sizeof(struct dm_version_request));
	version_req.hdr.type = DM_VERSION_REQUEST;
	version_req.hdr.size = sizeof(struct dm_version_request);
	version_req.hdr.trans_id = atomic_inc_return(&trans_id);
	version_req.version.version = dm->next_version;
	dm->version = version_req.version.version;

	/*
	 * Set the next version to try in case current version fails.
	 * Win7 protocol ought to be the last one to try.
	 */
	switch (version_req.version.version) {
	case DYNMEM_PROTOCOL_VERSION_WIN8:
		dm->next_version = DYNMEM_PROTOCOL_VERSION_WIN7;
		version_req.is_last_attempt = 0;
		break;
	default:
		dm->next_version = 0;
		version_req.is_last_attempt = 1;
	}

	ret = vmbus_sendpacket(dm->dev->channel, &version_req,
				sizeof(struct dm_version_request),
				(unsigned long)NULL,
				VM_PKT_DATA_INBAND, 0);

	if (ret)
		goto version_error;

	return;

version_error:
	dm->state = DM_INIT_ERROR;
	complete(&dm->host_event);
}