Index: linux-2.6.39.4/drivers/usb/class/cdc-acm.c
===================================================================
--- linux-2.6.39.4.orig/drivers/usb/class/cdc-acm.c	2013-02-19 09:22:57.860051682 -0600
+++ linux-2.6.39.4/drivers/usb/class/cdc-acm.c	2013-02-19 09:30:35.274209660 -0600
@@ -963,6 +963,12 @@
 		goto skip_normal_probe;
 	}
 
+	/* ignore devices we don't want to support */
+	if (quirks == IGNORE_DEVICE) {
+		dev_dbg(&intf->dev, "Ignoring device\n");
+		return -ENODEV;
+	}
+
 	/* normal probing*/
 	if (!buffer) {
 		dev_err(&intf->dev, "Weird descriptor references\n");
@@ -1633,6 +1639,18 @@
 	.driver_info = NO_DATA_INTERFACE,
 	},
 
+	/* 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) },
Index: linux-2.6.39.4/drivers/usb/class/cdc-acm.h
===================================================================
--- linux-2.6.39.4.orig/drivers/usb/class/cdc-acm.h	2013-02-19 09:22:54.860050647 -0600
+++ linux-2.6.39.4/drivers/usb/class/cdc-acm.h	2013-02-19 09:24:00.856126438 -0600
@@ -138,3 +138,4 @@
 #define NO_CAP_LINE			4
 #define NOT_A_MODEM			8
 #define NO_DATA_INTERFACE		16
+#define IGNORE_DEVICE			32