diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index b29a1b279fff4c346dff158565309747b8b4212d..41bdfb684d4685108b8f61b8b29ba4f99ee2fd89 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1326,11 +1326,21 @@ int xenvif_tx_action(struct xenvif_queue *queue, int budget)
 		return 0;
 
 	gnttab_batch_copy(queue->tx_copy_ops, nr_cops);
-	if (nr_mops != 0)
+	if (nr_mops != 0) {
 		ret = gnttab_map_refs(queue->tx_map_ops,
 				      NULL,
 				      queue->pages_to_map,
 				      nr_mops);
+		if (ret) {
+			unsigned int i;
+
+			netdev_err(queue->vif->dev, "Map fail: nr %u ret %d\n",
+				   nr_mops, ret);
+			for (i = 0; i < nr_mops; ++i)
+				WARN_ON_ONCE(queue->tx_map_ops[i].status ==
+				             GNTST_okay);
+		}
+	}
 
 	work_done = xenvif_tx_submit(queue);