1 files changed, 19 insertions, 15 deletions

diff --git a/sys/dev/xen/blkfront/blkfront.c b/sys/dev/xen/blkfront/blkfront.c
index 3061a82a26f0..f36ffb128082 100644
--- a/sys/dev/xen/blkfront/blkfront.c
+++ b/sys/dev/xen/blkfront/blkfront.c
@@ -698,21 +698,25 @@ blkfront_initialize(struct xb_softc *sc)
 		return;
 
 	/* Support both backend schemes for relaying ring page limits. */
-	error = xs_printf(XST_NIL, node_path,
-			 "num-ring-pages","%u", sc->ring_pages);
-	if (error) {
-		xenbus_dev_fatal(sc->xb_dev, error,
-				 "writing %s/num-ring-pages",
-				 node_path);
-		return;
-	}
-	error = xs_printf(XST_NIL, node_path,
-			 "ring-page-order","%u", fls(sc->ring_pages) - 1);
-	if (error) {
-		xenbus_dev_fatal(sc->xb_dev, error,
-				 "writing %s/ring-page-order",
-				 node_path);
-		return;
+	if (sc->ring_pages > 1) {
+		error = xs_printf(XST_NIL, node_path,
+				 "num-ring-pages","%u", sc->ring_pages);
+		if (error) {
+			xenbus_dev_fatal(sc->xb_dev, error,
+					 "writing %s/num-ring-pages",
+					 node_path);
+			return;
+		}
+
+		error = xs_printf(XST_NIL, node_path,
+				 "ring-page-order", "%u",
+				 fls(sc->ring_pages) - 1);
+		if (error) {
+			xenbus_dev_fatal(sc->xb_dev, error,
+					 "writing %s/ring-page-order",
+					 node_path);
+			return;
+		}
 	}
 
 	error = xs_printf(XST_NIL, node_path,