Messages in this thread | | | Date | Sun, 25 Mar 2012 19:31:14 +0100 | From | Al Viro <> | Subject | Re: TTY: tty_port questions |
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How is tty_port supposed to work wrt hotplug? I.e. are those guys (OK, the structures they are embedded into) supposed to live as long as tty_driver lives? AFAICS, for serial we have an extra layer atop of those guys (uart_port) and that's where removals seem to act, but there seems to be more to it...
Suppose we handle uml reconfig requests as port removal + port addition; what's needed to make sure that port is out of use and we can play with it without stepping on anyone's toes? Something along the lines of what uart_remove_one_port() is doing? I.e. tty_unregister_device() + tty_vhangup()? But serial_core seems to be open-coding tty_port_open() for some reason and _there_ we have port->count updates under port->mutex, so the situation might be different...
Is there any FMtoR/thread/search terms that would give the description of the situation?
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