Re: [PATCH v2 1/8] tty: add a poll() callback in struct tty_operations

[Alan Cox]

> That would cut it, but TIOCPKT is too coupled with having a linked tty.
> I could make acm behave like a pty (accept TIOCPKT and issue the
> ctrl_status bits), but for that I need n_tty to know that packet does
> not always mean a linked tty is present, and that in case it isn't we
> take our own ctrl_status bits instead of the link's. I could write a
> small (inline?) function to fetch the correct ctrl_status bits and put
> that in n_tty. Does that make sense?

I think that makes sense, and I would do the job properly rather than do
a hack with tty->link. Those hacks in the long term never work out the
best approach.

Alan