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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: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Aleksey Gorelov 2008-06-19 15:22:17 -07:00 committed by Greg Kroah-Hartman
parent 830f4021a8
commit 71be4f81e9
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/serial/usb_debug.c
View File

@ -15,6 +15,8 @@
#include <linux/usb.h> #include <linux/usb.h>
#include <linux/usb/serial.h> #include <linux/usb/serial.h>
#define USB_DEBUG_MAX_PACKET_SIZE 8
static struct usb_device_id id_table [] = { static struct usb_device_id id_table [] = {
{ USB_DEVICE(0x0525, 0x127a) }, { USB_DEVICE(0x0525, 0x127a) },
{ }, { },
@ -29,6 +31,12 @@ static struct usb_driver debug_driver = {
.no_dynamic_id = 1, .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 = { static struct usb_serial_driver debug_device = {
.driver = { .driver = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
@ -36,6 +44,7 @@ static struct usb_serial_driver debug_device = {
}, },
.id_table = id_table, .id_table = id_table,
.num_ports = 1, .num_ports = 1,
.open = usb_debug_open,
}; };
static int __init debug_init(void) static int __init debug_init(void)