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From: Hans Petter Selasky <hselasky@c2i.net>
To: Ed Schouten <ed@80386.nl>
Date: Wed, 8 Aug 2012 19:42:24 +0200
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Cc: Konstantin Belousov <kostikbel@gmail.com>, freebsd-current@freebsd.org
Subject: Re: ttydev_cdevsw has no d_purge
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On Wednesday 08 August 2012 19:24:18 Ed Schouten wrote:
> 2012/8/8 Hans Petter Selasky <hselasky@c2i.net>:
> >> I have a question regarding the changed fragment of code. Why don't you
> >> use unr(9) KPI to manage unit numbers ?
> > 
> > Probably I could, but right now the unr interface doesn't support pending
> > unit free which I need for other reasons, see below.
> 
> What does `pending unit free' mean? I also would prefer it if you used
> unr(9) -- not just here, but across the entire USB stack.

It is like a drain state, where a unit is collected for free, and then 
committed to free state when the tsw_free() is called. In the [unlocked] time 
in between the unit cannot be re-used.

--HPS