diff --git a/sys/dev/sound/midi/midi.c b/sys/dev/sound/midi/midi.c
--- a/sys/dev/sound/midi/midi.c
+++ b/sys/dev/sound/midi/midi.c
@@ -128,8 +128,6 @@
 	if (outqsize)
 		obuf = malloc(outqsize, M_MIDI, M_WAITOK);
 
-	mtx_lock(&m->lock);
-
 	m->hiwat = outqsize / 2;
 
 	MIDIQ_INIT(m->inq, ibuf, inqsize);
@@ -143,8 +141,6 @@
 	if (MPU_INIT(m, cookie))
 		goto err2;
 
-	mtx_unlock(&m->lock);
-
 	m->dev = make_dev(&midi_cdevsw, m->unit, UID_ROOT, GID_WHEEL, 0666,
 	    "midi%d.%d", m->unit, m->channel);
 	m->dev->si_drv1 = m;