Yes, the latter case was in my mind that whoever runs this driver on earlier stable kernel and has enough devices on the bus where previous code will calculate wrong can request the backport or at least be vocal about it :-)
Stable rules allow also cherry picking additional patches. To me picking
patch 1 and 4 sounds better than an intermediate fix since bug has been here
from the beginning. IMHO not so urgent than a regression.
Even then, doesn't that mean that the series needs to be applied
upstream first before it can go to stable? How to describe the
dependency commit id otherwise? Either Alexandre adds this when
applying, or some interested party ;) sends a backport request to
stable. Or am I missing something?