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");