Commit 71be4f81 authored by Aleksey Gorelov's avatar Aleksey Gorelov Committed by Greg Kroah-Hartman

USB: debug port converter does not accept more than 8 byte packets

USB debug port only supports 8 byte rx/tx packets. Although spec implies that
"if a packet larger than eight bytes is received from the remote computer, the
device must break the larger packet into eight-byte packets before sending the
data to the Debug Port", the real PLX NET20DC device does not handle it right -
data is corrupted on debug port end if serial interface sends >8 byte urbs.
Patch below fixes the issue by limiting tx urb to 8 byte.

Signed off by: Aleks Gorelov <dared1st@yahoo.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 830f4021
......@@ -15,6 +15,8 @@
#include <linux/usb.h>
#include <linux/usb/serial.h>
#define USB_DEBUG_MAX_PACKET_SIZE 8
static struct usb_device_id id_table [] = {
{ USB_DEVICE(0x0525, 0x127a) },
{ },
......@@ -29,6 +31,12 @@ static struct usb_driver debug_driver = {
.no_dynamic_id = 1,
};
int usb_debug_open(struct usb_serial_port *port, struct file *filp)
{
port->bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE;
return usb_serial_generic_open(port, filp);
}
static struct usb_serial_driver debug_device = {
.driver = {
.owner = THIS_MODULE,
......@@ -36,6 +44,7 @@ static struct usb_serial_driver debug_device = {
},
.id_table = id_table,
.num_ports = 1,
.open = usb_debug_open,
};
static int __init debug_init(void)
......
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