Hi all,

I have been attempting to get SCO over HCI to work... I have a D-Link 
DBT-120 (B2).  When I startup hcid, I was getting the following error 
message:

hci_usb_isoc_rx_submit: hci0 isoc rx submit failed urb de96e614 err -90
hci_usb_isoc_rx_submit: hci0 isoc rx submit failed urb de96e614 err -90

It appears this occurs since the hci_usb driver is picking a bogus 
endpoint with a wMaxPacketSize = 0 when submitting the urb.

Attached are a few files for assistance:

hciconfig.txt                          'hciconfig -a'
lsusb.txt                                'lsusb -v'
hci_usb_sco_debug.log.gz     Debug logs from /var/log/messages
patch-2.6.2-tj1.gz                  a patch

The attached patch includes patch-2.4.24-mh2, a fix for the error, and a 
few minor fixes so the kernel can build when debugging is enabled...

This does not fix SCO support, It simply assists in getting an endpoint 
where wMaxPacketSize != 0.

Here is the critical part, or what eliminates -90:

<patch>

diff --unified --recursive --new-file linux-2.6.2/drivers/bluetooth/hci_usb.c linux-2.6.2-tj/drivers/bluetooth/hci_usb.c
--- linux-2.6.2/drivers/bluetooth/hci_usb.c	2004-02-03 22:44:43.000000000 -0500
+++ linux-2.6.2-tj/drivers/bluetooth/hci_usb.c	2004-02-16 13:15:11.000000000 -0500

@@ -833,7 +834,7 @@
 
 #ifdef CONFIG_BT_HCIUSB_SCO
 				case USB_ENDPOINT_XFER_ISOC:
-					if (ep->desc.wMaxPacketSize < size || a > 2)
+					if (ep->desc.wMaxPacketSize <= size)
 						break;
 					size = ep->desc.wMaxPacketSize;

</patch>

Now that the error is gone, SCO still is not working.  Since I enabled 
debugging with this patch, I was able to capture additional data to 
assist someone whom knows much more than I in fixing the SCO over HCI_USB.

If I'm completely clueless, please disregard, and sorry to waste your 
time! Thanks in advance!

        Regards,

        Todd E. Johnson