diff --git a/sys/dev/sound/pci/atiixp.c b/sys/dev/sound/pci/atiixp.c
index 58d99ae4d5f..6842c294b48 100644
--- a/sys/dev/sound/pci/atiixp.c
+++ b/sys/dev/sound/pci/atiixp.c
@@ -1111,6 +1111,13 @@ atiixp_release_resource(struct atiixp_info *sc)
 {
 	if (sc == NULL)
 		return;
+	if (sc->registered_channels != 0) {
+		atiixp_lock(sc);
+		sc->polling = 0;
+		callout_stop(&sc->poll_timer);
+		atiixp_unlock(sc);
+		callout_drain(&sc->poll_timer);
+	}
 	if (sc->codec) {
 		ac97_destroy(sc->codec);
 		sc->codec = NULL;
@@ -1146,6 +1153,7 @@ atiixp_release_resource(struct atiixp_info *sc)
 		snd_mtxfree(sc->lock);
 		sc->lock = NULL;
 	}
+	free(sc, M_DEVBUF);
 }
 
 static int
@@ -1173,11 +1181,7 @@ atiixp_pci_attach(device_t dev)
 	struct atiixp_info *sc;
 	int i;
 
-	if ((sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL) {
-		device_printf(dev, "cannot allocate softc\n");
-		return (ENXIO);
-	}
-
+	sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK | M_ZERO);
 	sc->lock = snd_mtxcreate(device_get_nameunit(dev), "snd_atiixp softc");
 	sc->dev = dev;
 
@@ -1312,7 +1316,6 @@ atiixp_pci_detach(device_t dev)
 		if (sc->st != 0 && sc->sh != 0)
 			atiixp_disable_interrupts(sc);
 		atiixp_release_resource(sc);
-		free(sc, M_DEVBUF);
 	}
 	return (0);
 }
diff --git a/sys/dev/sound/pci/es137x.c b/sys/dev/sound/pci/es137x.c
index 0daaad8ff00..e332db3a7f5 100644
--- a/sys/dev/sound/pci/es137x.c
+++ b/sys/dev/sound/pci/es137x.c
@@ -1885,6 +1885,15 @@ es_pci_detach(device_t dev)
 		return (r);
 
 	es = pcm_getdevinfo(dev);
+
+	if (es != NULL && es->num != 0) {
+		ES_LOCK(es);
+		es->polling = 0;
+		callout_stop(&es->poll_timer);
+		ES_UNLOCK(es);
+		callout_drain(&es->poll_timer);
+	}
+
 	bus_teardown_intr(dev, es->irq, es->ih);
 	bus_release_resource(dev, SYS_RES_IRQ, es->irqid, es->irq);
 	bus_release_resource(dev, es->regtype, es->regid, es->reg);
diff --git a/sys/dev/sound/pci/hda/hdac.c b/sys/dev/sound/pci/hda/hdac.c
index 69cff378ef4..4c048a45160 100644
--- a/sys/dev/sound/pci/hda/hdac.c
+++ b/sys/dev/sound/pci/hda/hdac.c
@@ -3576,12 +3576,7 @@ hdac_attach(device_t dev)
 	uint16_t vendor;
 	uint8_t v;
 
-	sc = malloc(sizeof(*sc), M_DEVBUF, M_NOWAIT | M_ZERO);
-	if (sc == NULL) {
-		device_printf(dev, "cannot allocate softc\n");
-		return (ENOMEM);
-	}
-
+	sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK | M_ZERO);
 	sc->lock = snd_mtxcreate(device_get_nameunit(dev), HDAC_MTX_NAME);
 	sc->dev = dev;
 	sc->pci_subvendor = (uint32_t)pci_get_subdevice(sc->dev) << 16;
@@ -5608,10 +5603,12 @@ hdac_release_resources(struct hdac_softc *sc)
 	hdac_lock(sc);
 	sc->polling = 0;
 	sc->poll_ival = 0;
+	callout_stop(&sc->poll_hda);
 	callout_stop(&sc->poll_hdac);
 	callout_stop(&sc->poll_jack);
 	hdac_reset(sc);
 	hdac_unlock(sc);
+	callout_drain(&sc->poll_hda);
 	callout_drain(&sc->poll_hdac);
 	callout_drain(&sc->poll_jack);
 
diff --git a/sys/dev/sound/pci/via8233.c b/sys/dev/sound/pci/via8233.c
index c35129363f7..68de81b7e5f 100644
--- a/sys/dev/sound/pci/via8233.c
+++ b/sys/dev/sound/pci/via8233.c
@@ -1171,10 +1171,7 @@ via_attach(device_t dev)
 	int nsegs;
 	uint32_t revid;
 
-	if ((via = malloc(sizeof *via, M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL) {
-		device_printf(dev, "cannot allocate softc\n");
-		return (ENXIO);
-	}
+	via = malloc(sizeof *via, M_DEVBUF, M_WAITOK | M_ZERO);
 	via->lock = snd_mtxcreate(device_get_nameunit(dev),
 	    "snd_via8233 softc");
 	via->dev = dev;
@@ -1402,13 +1399,22 @@ static int
 via_detach(device_t dev)
 {
 	int r;
-	struct via_info *via = 0;
+	struct via_info *via;
 
 	r = pcm_unregister(dev);
 	if (r)
 		return (r);
 
 	via = pcm_getdevinfo(dev);
+
+	if (via != NULL && (via->play_num != 0 || via->rec_num != 0)) {
+		snd_mtxlock(via->lock);
+		via->polling = 0;
+		callout_stop(&via->poll_timer);
+		snd_mtxunlock(via->lock);
+		callout_drain(&via->poll_timer);
+	}
+
 	bus_release_resource(dev, SYS_RES_IOPORT, via->regid, via->reg);
 	bus_teardown_intr(dev, via->irq, via->ih);
 	bus_release_resource(dev, SYS_RES_IRQ, via->irqid, via->irq);