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Date: Wed, 29 Aug 2012 23:22:55 -0400
From: John Baldwin <jhb@FreeBSD.org>
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Subject: [PATCH] Locking for adw(4)
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Continuing with the theme of locking older storage drivers, I have
patches to add locking to adw(4) and mark it MPSAFE.  The patches are
from HEAD but should apply to 8 or 9.  If you test it on 8 or 9 please
enable INVARIANTS for at least the initial testing.  Thanks.

http://www.FreeBSD.org/~jhb/patches/adw_locking.patch

-- 
John Baldwin