diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index e4b7f00..d949871 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2443,6 +2443,10 @@ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
 	if (!room_on_ring(xhci, ep_ring, num_trbs)) {
 		/* FIXME allocate more room */
 		xhci_err(xhci, "ERROR no room on ep ring\n");
+		xhci_err(xhci, "Event ring:\n");
+		xhci_debug_ring(xhci, xhci->event_ring);
+		xhci_err(xhci, "Endpoint ring:\n");
+		xhci_debug_ring(xhci, ep_ring);
 		return -ENOMEM;
 	}