Index: src/sys/dev/sound/pcm/dsp.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/sound/pcm/dsp.c,v
retrieving revision 1.108
diff -u -r1.108 dsp.c
--- src/sys/dev/sound/pcm/dsp.c	11 Apr 2008 15:26:25 -0000	1.108
+++ src/sys/dev/sound/pcm/dsp.c	26 May 2008 11:26:54 -0000
@@ -661,7 +661,14 @@
 			 * process.
 			 */
 			(void)snd_clone_release(i_dev);
+
+			/*
+			 * destroy_dev() might sleep, so release pcm lock
+			 * here and rely on pcm cv serialization.
+			 */
+			pcm_unlock(d);
 			(void)snd_clone_unref(i_dev);
+			pcm_lock(d);
 		}
 		PCM_RELEASE(d);
 	}