diff --git a/[refs] b/[refs]
index 68f9424fdf6d..0cca6030f774 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f0d44ae310bc8eb0b6694e257015d8b24e1a357c
+refs/heads/master: bae584316045011ce3376816585a305d2b9b76f2
diff --git a/trunk/drivers/isdn/i4l/isdn_net.c b/trunk/drivers/isdn/i4l/isdn_net.c
index 7c5f97033b9f..de6be7181f07 100644
--- a/trunk/drivers/isdn/i4l/isdn_net.c
+++ b/trunk/drivers/isdn/i4l/isdn_net.c
@@ -292,7 +292,9 @@ isdn_net_unbind_channel(isdn_net_local * lp)
 	lp->dialstate = 0;
 	dev->rx_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL;
 	dev->st_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL;
-	isdn_free_channel(lp->isdn_device, lp->isdn_channel, ISDN_USAGE_NET);
+	if (lp->isdn_device != -1 && lp->isdn_channel != -1)
+		isdn_free_channel(lp->isdn_device, lp->isdn_channel,
+				  ISDN_USAGE_NET);
 	lp->flags &= ~ISDN_NET_CONNECTED;
 	lp->isdn_device = -1;
 	lp->isdn_channel = -1;