Hi Vladis,
Certain ttys lack operations (eg: pty_unix98_ops) which still can be called by certain hci uart proto (eg: mrvl, ath). Currently this leads to execution at address 0x0. Fix this by adding checks for missing tty operations.
so I really prefer that we just fail setting the line discipline. These drivers need to check that the underlying transport has all the operations available they need. We can not just ignore them.
Regards
Marcel