static int gb_svc_request_handler()

in svc.c [1221:1284]

• 51 lines of code
• 16 McCabe index (conditional complexity)

static int gb_svc_request_handler(struct gb_operation *op)
{
	struct gb_connection *connection = op->connection;
	struct gb_svc *svc = gb_connection_get_data(connection);
	u8 type = op->type;
	int ret = 0;

	/*
	 * SVC requests need to follow a specific order (at least initially) and
	 * below code takes care of enforcing that. The expected order is:
	 * - PROTOCOL_VERSION
	 * - SVC_HELLO
	 * - Any other request, but the earlier two.
	 *
	 * Incoming requests are guaranteed to be serialized and so we don't
	 * need to protect 'state' for any races.
	 */
	switch (type) {
	case GB_SVC_TYPE_PROTOCOL_VERSION:
		if (svc->state != GB_SVC_STATE_RESET)
			ret = -EINVAL;
		break;
	case GB_SVC_TYPE_SVC_HELLO:
		if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION)
			ret = -EINVAL;
		break;
	default:
		if (svc->state != GB_SVC_STATE_SVC_HELLO)
			ret = -EINVAL;
		break;
	}

	if (ret) {
		dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n",
			 type, svc->state);
		return ret;
	}

	switch (type) {
	case GB_SVC_TYPE_PROTOCOL_VERSION:
		ret = gb_svc_version_request(op);
		if (!ret)
			svc->state = GB_SVC_STATE_PROTOCOL_VERSION;
		return ret;
	case GB_SVC_TYPE_SVC_HELLO:
		ret = gb_svc_hello(op);
		if (!ret)
			svc->state = GB_SVC_STATE_SVC_HELLO;
		return ret;
	case GB_SVC_TYPE_INTF_RESET:
		return gb_svc_intf_reset_recv(op);
	case GB_SVC_TYPE_MODULE_INSERTED:
		return gb_svc_module_inserted_recv(op);
	case GB_SVC_TYPE_MODULE_REMOVED:
		return gb_svc_module_removed_recv(op);
	case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
		return gb_svc_intf_mailbox_event_recv(op);
	case GB_SVC_TYPE_INTF_OOPS:
		return gb_svc_intf_oops_recv(op);
	default:
		dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
		return -EINVAL;
	}
}