int slim_xfer_msg()

in messaging.c [233:271]

• 31 lines of code
• 8 McCabe index (conditional complexity)

int slim_xfer_msg(struct slim_device *sbdev, struct slim_val_inf *msg,
		  u8 mc)
{
	DEFINE_SLIM_LDEST_TXN(txn_stack, mc, 6, sbdev->laddr, msg);
	struct slim_msg_txn *txn = &txn_stack;
	struct slim_controller *ctrl = sbdev->ctrl;
	int ret;
	u16 sl;

	if (!ctrl)
		return -EINVAL;

	ret = slim_val_inf_sanity(ctrl, msg, mc);
	if (ret)
		return ret;

	sl = slim_slicesize(msg->num_bytes);

	dev_dbg(ctrl->dev, "SB xfer msg:os:%x, len:%d, MC:%x, sl:%x\n",
		msg->start_offset, msg->num_bytes, mc, sl);

	txn->ec = ((sl | (1 << 3)) | ((msg->start_offset & 0xFFF) << 4));

	switch (mc) {
	case SLIM_MSG_MC_REQUEST_CHANGE_VALUE:
	case SLIM_MSG_MC_CHANGE_VALUE:
	case SLIM_MSG_MC_REQUEST_CLEAR_INFORMATION:
	case SLIM_MSG_MC_CLEAR_INFORMATION:
		txn->rl += msg->num_bytes;
		break;
	default:
		break;
	}

	if (slim_tid_txn(txn->mt, txn->mc))
		txn->rl++;

	return slim_do_transfer(ctrl, txn);
}