diff --git a/[refs] b/[refs]
index c9fba396e95c..6afe2aa43f6f 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3305adffc556f7998b40c31afcef4c8755ce919a
+refs/heads/master: ee239d9901c13040598f6c46d5017869c6d14e2e
diff --git a/trunk/drivers/isdn/gigaset/i4l.c b/trunk/drivers/isdn/gigaset/i4l.c
index 9b22f9cf2f33..322f16ebc6ec 100644
--- a/trunk/drivers/isdn/gigaset/i4l.c
+++ b/trunk/drivers/isdn/gigaset/i4l.c
@@ -51,6 +51,12 @@ static int writebuf_from_LL(int driverID, int channel, int ack,
 		return -ENODEV;
 	}
 	bcs = &cs->bcs[channel];
+
+	/* can only handle linear sk_buffs */
+	if (skb_linearize(skb) < 0) {
+		dev_err(cs->dev, "%s: skb_linearize failed\n", __func__);
+		return -ENOMEM;
+	}
 	len = skb->len;
 
 	gig_dbg(DEBUG_LLDATA,