diff --git a/[refs] b/[refs]
index 2b745198e41b..658284bacbc1 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 68a351c501ad22077a969df157cd13367cb43a40
+refs/heads/master: 0e0367e980b55629917f3dd5f5f0ccbf3d0dab62
diff --git a/trunk/drivers/net/usb/hso.c b/trunk/drivers/net/usb/hso.c
index 7482d0d5e278..67eb8390cf07 100644
--- a/trunk/drivers/net/usb/hso.c
+++ b/trunk/drivers/net/usb/hso.c
@@ -1723,6 +1723,10 @@ static int hso_serial_tiocmset(struct tty_struct *tty, struct file *file,
 		D1("no tty structures");
 		return -EINVAL;
 	}
+
+	if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
+		return -EINVAL;
+
 	if_num = serial->parent->interface->altsetting->desc.bInterfaceNumber;
 
 	spin_lock_irqsave(&serial->serial_lock, flags);