diff --git a/sound/usb/line6/pcm.c b/sound/usb/line6/pcm.c
index 41aa3355e920..a531881b2be6 100644
--- a/sound/usb/line6/pcm.c
+++ b/sound/usb/line6/pcm.c
@@ -529,6 +529,11 @@ int line6_init_pcm(struct usb_line6 *line6,
 				usb_rcvisocpipe(line6->usbdev, ep_read), 0),
 			usb_maxpacket(line6->usbdev,
 				usb_sndisocpipe(line6->usbdev, ep_write), 1));
+	if (!line6pcm->max_packet_size) {
+		dev_err(line6pcm->line6->ifcdev,
+			"cannot get proper max packet size\n");
+		return -EINVAL;
+	}
 
 	spin_lock_init(&line6pcm->out.lock);
 	spin_lock_init(&line6pcm->in.lock);