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Date: Thu, 21 May 2009 17:17:39 -0600 (MDT)
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To: attilio@freebsd.org
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: scottl@samsco.org, src-committers@freebsd.org, jhb@freebsd.org,
	svn-src-all@freebsd.org, svn-src-head@freebsd.org,
	rwatson@freebsd.org, kostikbel@gmail.com
Subject: Re: svn commit: r192535 - head/sys/kern
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In message: <3bbf2fe10905211511g53defb6cmac45fc2469cc64f@mail.gmail.com>
            Attilio Rao <attilio@freebsd.org> writes:
: At this point I wonder what's the purpose of maintaining the sleeping
: version for such functions?

As John explained, destroy_dev() needs to sleep to flush all the
threads out of the driver callbacks.

Warner