diff --git a/sys/dev/sound/pcm/sound.h b/sys/dev/sound/pcm/sound.h
--- a/sys/dev/sound/pcm/sound.h
+++ b/sys/dev/sound/pcm/sound.h
@@ -320,7 +320,6 @@
     pid_t pid, char *comm, int devunit);
 int pcm_chnrelease(struct pcm_channel *c);
 int pcm_chnref(struct pcm_channel *c, int ref);
-int pcm_inprog(struct snddev_info *d, int delta);
 
 struct pcm_channel *pcm_chn_create(struct snddev_info *d, struct pcm_channel *parent, kobj_class_t cls, int dir, int num, void *devinfo);
 int pcm_chn_destroy(struct pcm_channel *ch);
@@ -379,7 +378,6 @@
 	struct snd_clone *clones;
 	unsigned devcount, playcount, reccount, pvchancount, rvchancount ;
 	unsigned flags;
-	int inprog;
 	unsigned int bufsz;
 	void *devinfo;
 	device_t dev;
diff --git a/sys/dev/sound/pcm/sound.c b/sys/dev/sound/pcm/sound.c
--- a/sys/dev/sound/pcm/sound.c
+++ b/sys/dev/sound/pcm/sound.c
@@ -392,16 +392,6 @@
 	return (c->refcount);
 }
 
-int
-pcm_inprog(struct snddev_info *d, int delta)
-{
-	PCM_LOCKASSERT(d);
-
-	d->inprog += delta;
-
-	return (d->inprog);
-}
-
 static void
 pcm_setmaxautovchans(struct snddev_info *d, int num)
 {
@@ -1127,7 +1117,6 @@
 	d->pvchanformat = 0;
 	d->rvchanrate = 0;
 	d->rvchanformat = 0;
-	d->inprog = 0;
 
 	/*
 	 * Create clone manager, disabled by default. Cloning will be
@@ -1182,12 +1171,6 @@
 
 	d->flags |= SD_F_DETACHING;
 
-	if (d->inprog != 0) {
-		device_printf(dev, "unregister: operation in progress\n");
-		PCM_UNLOCK(d);
-		return (EBUSY);
-	}
-
 	PCM_ACQUIRE(d);
 	PCM_UNLOCK(d);