diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index ef0c1baaefde..87a30be64324 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -909,8 +909,13 @@ get_sync_ep_from_substream(struct snd_usb_substream *subs)
 			continue;
 		/* for the implicit fb, check the sync ep as well */
 		ep = snd_usb_get_endpoint(chip, fp->sync_ep);
-		if (ep && ep->cur_audiofmt)
-			return ep;
+		if (ep && ep->cur_audiofmt) {
+			/* ditto, if the sync (data) ep is used by others,
+			 * this stream is restricted by the sync ep
+			 */
+			if (ep != subs->sync_endpoint || ep->opened > 1)
+				return ep;
+		}
 	}
 	return NULL;
 }