Re: ttydev_cdevsw has no d_purge

Hi Hans,

2012/8/5 Hans Petter Selasky <hselasky@c2i.net>:
> When can the previous unit number be re-used? Is there a callback for this?

The unit number can be reused after .tsw_free() has been called.

> When can the USB serial code assume that it will not be called again and that
> all callbacks are drained?

The tty_rel_gone() function has to be called while holding the TTY
lock. Also, all calls done by the TTY layer into the driver also hold
the TTY lock and will assert that the TTY is not in the `gone' state.
So you can safely assume that you will not get any driver calls as
soon as tty_rel_gone() returns.

I hope this helps. If you have any further questions, let me know!

-- 
Ed Schouten <ed@80386.nl>
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