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From: Hans Petter Selasky <hselasky@c2i.net>
To: Weongyo Jeong <weongyo@freebsd.org>
Date: Fri, 27 Mar 2009 08:36:54 +0100
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Cc: freebsd-usb@freebsd.org
Subject: Re: q: a trivial question of usb2_transfer_unsetup()
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On Friday 27 March 2009, Weongyo Jeong wrote:
> Hello Hans,
>
> I have a simple question that is there a possibility for .mh.callback of
> usb2_config to be called after usb2_transfer_unsetup()?

Hi,

usb2_transfer_unsetup() calls usb2_transfer_drain() which ensures that the 
callback has exited before returning. Even if you drop the private transfer 
lock in the callback and pick it up before returning.

--HPS