Index: linux-3.12.13/drivers/usb/class/cdc-acm.c
===================================================================
--- linux-3.12.13.orig/drivers/usb/class/cdc-acm.c	2014-02-22 15:32:50.000000000 -0600
+++ linux-3.12.13/drivers/usb/class/cdc-acm.c	2014-04-14 11:30:29.486386713 -0500
@@ -949,8 +949,10 @@
 	/* normal quirks */
 	quirks = (unsigned long)id->driver_info;
 
-	if (quirks == IGNORE_DEVICE)
+	if (quirks == IGNORE_DEVICE) {
+		dev_dbg(&intf->dev, "Ignoring device\n");
 		return -ENODEV;
+	}
 
 	num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : ACM_NR;
 
@@ -1676,6 +1678,18 @@
 	},
 #endif
 
+	/* Ignore Exar XR21V141X usb serial chips
+	 * This elminates conflicting with the Exar vizzini driver */
+	{USB_DEVICE(0x04e2, 0x1410),
+	.driver_info = IGNORE_DEVICE,
+	},
+	{USB_DEVICE(0x04e2, 0x1412),
+	.driver_info = IGNORE_DEVICE,
+	},
+	{USB_DEVICE(0x04e2, 0x1414),
+	.driver_info = IGNORE_DEVICE,
+	},
+
 	/* control interfaces without any protocol set */
 	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
 		USB_CDC_PROTO_NONE) },