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From: Scott Long <scottl@samsco.org>
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Date: Sun, 26 Jun 2011 06:51:34 -0600
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To: "Justin T. Gibbs" <gibbs@FreeBSD.org>
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Subject: Re: svn commit: r223557 - head/sys/cam/scsi
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On Jun 25, 2011, at 7:32 PM, Justin T. Gibbs wrote:

> Author: gibbs
> Date: Sun Jun 26 01:32:46 2011
> New Revision: 223557
> URL: http://svn.freebsd.org/changeset/base/223557
>=20
> Log:
> cam/scsi/scsi_cd.c:
> 	In cdregister(), hold the periph lock semaphore during changer
> 	probe/configuration.  This removes a window where an open of the
> 	cd device may succeed before probe processing has completed.
>=20

I hope this works for Andre (and likely others).  Regardless though, =
cdregister() and daregister() need to be refactored to not require this =
delicate mess of locking hacks.

Scott