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From: John Baldwin <jhb@freebsd.org>
To: freebsd-current@freebsd.org
Subject: [PATCH] Fix callouts in rp(4)
Date: Fri, 19 Sep 2014 15:46:07 -0400
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This patch converts rp(4) from timeout(9) to callout(9).  To do this cleanly, 
it replaces a single, global timer that walks tables of controllers and ports 
to a per-controller timer.  This works much better with locking (since the 
locks are per-controller) and removes the need for various global lookup 
tables in the driver.  The patch is against HEAD but probably applies to 9 and 
10 as well.

http://people.freebsd.org/~jhb/patches/rp_callout.patch

-- 
John Baldwin