Changes to usb/serial: how to distinguish between old and new interfaces in 8-STABLE and 9-CURRENT branches?

[perryh at pluto.rain.com]

Lev Serebryakov <lev at freebsd.org> wrote:

>   Last changes, committed to 8-STABLE ... breaks some API/ABI ...

AFAIK, changes that break API/ABI are not supposed to be MFCd.
Perhaps that one needs to be backed out of 8-STABLE?