Index: linux-2.6.38.1/drivers/usb/serial/usb-serial.c
===================================================================
--- linux-2.6.38.1.orig/drivers/usb/serial/usb-serial.c	2011-03-23 21:04:47.000000000 +0100
+++ linux-2.6.38.1/drivers/usb/serial/usb-serial.c	2011-03-28 16:58:26.673254994 +0200
@@ -61,6 +61,7 @@ static struct usb_driver usb_serial_driv
    drivers depend on it.
 */
 
+static ushort maxSize = 0;
 static int debug;
 /* initially all NULL */
 static struct usb_serial *serial_table[SERIAL_TTY_MINORS];
@@ -912,7 +913,8 @@ int usb_serial_probe(struct usb_interfac
 			goto probe_error;
 		}
 		buffer_size = max_t(int, serial->type->bulk_in_size,
-				le16_to_cpu(endpoint->wMaxPacketSize));
+					 min_t(int, le16_to_cpu(endpoint->wMaxPacketSize),
+						    maxSize));
 		port->bulk_in_size = buffer_size;
 		port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
 		port->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
@@ -1391,3 +1393,5 @@ MODULE_LICENSE("GPL");
 
 module_param(debug, bool, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(debug, "Debug enabled or not");
+module_param(maxSize, ushort,0);
+MODULE_PARM_DESC(maxSize,"User specified USB endpoint size");