diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 61a73ad1a18..a3e9c095f0d 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -455,9 +455,6 @@ static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
 	struct usb_serial *serial = port->serial;
 	struct urb *urb;
 
-	if (endpoint == -1)
-		return NULL;	/* endpoint not needed */
-
 	urb = usb_alloc_urb(0, GFP_KERNEL);	/* No ISO */
 	if (urb == NULL) {
 		dev_dbg(&serial->interface->dev,
@@ -489,6 +486,9 @@ int usb_wwan_port_probe(struct usb_serial_port *port)
 	init_usb_anchor(&portdata->delayed);
 
 	for (i = 0; i < N_IN_URB; i++) {
+		if (!port->bulk_in_size)
+			break;
+
 		buffer = (u8 *)__get_free_page(GFP_KERNEL);
 		if (!buffer)
 			goto bail_out_error;
@@ -502,8 +502,8 @@ int usb_wwan_port_probe(struct usb_serial_port *port)
 	}
 
 	for (i = 0; i < N_OUT_URB; i++) {
-		if (port->bulk_out_endpointAddress == -1)
-			continue;
+		if (!port->bulk_out_size)
+			break;
 
 		buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 		if (!buffer)