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From: John Baldwin <jhb@FreeBSD.org>
Date: Fri, 4 Feb 2011 14:16:41 +0000 (UTC)
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Subject: svn commit: r218272 - head/sys/kern
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Author: jhb
Date: Fri Feb  4 14:16:41 2011
New Revision: 218272
URL: http://svn.freebsd.org/changeset/base/218272

Log:
  Always assert that the turnstile chain lock is held in turnstile_wait()
  and remove a duplicate hash lookup.
  
  MFC after:	1 week

Modified:
  head/sys/kern/subr_turnstile.c

Modified: head/sys/kern/subr_turnstile.c
==============================================================================
--- head/sys/kern/subr_turnstile.c	Fri Feb  4 14:13:15 2011	(r218271)
+++ head/sys/kern/subr_turnstile.c	Fri Feb  4 14:16:41 2011	(r218272)
@@ -685,8 +685,8 @@ turnstile_wait(struct turnstile *ts, str
 	 * turnstile already in use by this lock.
 	 */
 	tc = TC_LOOKUP(ts->ts_lockobj);
+	mtx_assert(&tc->tc_lock, MA_OWNED);
 	if (ts == td->td_turnstile) {
-		mtx_assert(&tc->tc_lock, MA_OWNED);
 #ifdef TURNSTILE_PROFILING
 		tc->tc_depth++;
 		if (tc->tc_depth > tc->tc_max_depth) {
@@ -695,7 +695,6 @@ turnstile_wait(struct turnstile *ts, str
 				turnstile_max_depth = tc->tc_max_depth;
 		}
 #endif
-		tc = TC_LOOKUP(ts->ts_lockobj);
 		LIST_INSERT_HEAD(&tc->tc_turnstiles, ts, ts_hash);
 		KASSERT(TAILQ_EMPTY(&ts->ts_pending),
 		    ("thread's turnstile has pending threads"));