---

yaml
---
r: 1539
b: refs/heads/master
c: 1149a64
h: refs/heads/master
i:
  1537: 50fc2dc
  1535: 4587caf
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4dc40a3cc4778ebcb6212bdb71b48690a153be07
+refs/heads/master: 1149a64fe4916fe6fdc8938043a0dc9a6551ab63

trunk/sound/usb/usbaudio.c

@@ -1051,10 +1051,7 @@ static int init_substream_urbs(snd_usb_substream_t *subs, unsigned int period_by
 			u->urb->pipe = subs->syncpipe;
 			u->urb->transfer_flags = URB_ISO_ASAP;
 			u->urb->number_of_packets = u->packets;
-			if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH)
-				u->urb->interval = 8;
-			else
-				u->urb->interval = 1;
+			u->urb->interval = 1 << subs->syncinterval;
 			u->urb->context = u;
 			u->urb->complete = snd_usb_complete_callback(snd_complete_sync_urb);
 		}
@@ -1272,7 +1269,12 @@ static int set_format(snd_usb_substream_t *subs, struct audioformat *fmt)
 			subs->syncpipe = usb_rcvisocpipe(dev, ep);
 		else
 			subs->syncpipe = usb_sndisocpipe(dev, ep);
-		subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
+		if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
+		    get_endpoint(alts, 1)->bRefresh >= 1 &&
+		    get_endpoint(alts, 1)->bRefresh <= 9)
+			subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
+		else
+			subs->syncinterval = 1;
 	}
 
 	/* always fill max packet size */