I shall not decide whether, when Charles Martel gave away the Church’s properties as fiefs, he gave them for life or in perpetuity. All I know is that in the time of Charlemagne  and Lothaire  these sorts of properties existed that passed on to heirs and were divided among them.
I find in addition that a part of them was given as allod, and the other part as fief. 
I have said that the owners of allods were subject to service like the owners of fiefs. That was doubtless in part the reason why Charles Martel donated in allods as well as in fiefs.