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    SubjectRe: BUG: NULL pointer deref in tty port / uart
    > have the same issue.. looks like we should not NULL the port->tty
    > if there's blocked open, but not sure what's exactly the logic
    > behind "port's block_open and count" ..

    A pending open is not a user of the tty as far as the rest of the stack
    is concerned. I also don't see why clearing port->tty is causing this
    crash because nothing on that path should ever be going via port->tty and
    it isn't safe to do so.

    > attached patch fixes it for me

    But still breaks on hangup where we can't do that.

    Where is port->tty getting misused to cause the crash, that is the bit
    I'm missing somewhere.


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