I've only seen this issue on ASMedia XHCI's (tested with latest fw/driver) but
the call that uses SPDRP_ADDRESS to query the port number a device is on yields
incorrect information. That information is later used by the
IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX iotcl to get information about the
device. however since the port_nr is wrong, the hub driver correctly reports
back 'no device connected' causing the device to be unavailable from libusb.
```
CHAR DevLocation[256];
.
.
.
// The SPDRP_ADDRESS for USB devices is the device port number on the hub
port_nr = 0;
if ((pass >= HUB_PASS) && (pass <= GEN_PASS)) {
if (
(!pSetupDiGetDeviceRegistryPropertyA(dev_info, &dev_info_data, SPDRP_ADDRESS,
®_type, (BYTE*)&port_nr, 4, &size))
|| (size != 4) ) {
usbi_warn(ctx, "could not retrieve port
number for device '%s', skipping: %s",
dev_id_path,
windows_error_str(0));
continue;
}
}
if (pSetupDiGetDeviceRegistryPropertyA(dev_info,
&dev_info_data, SPDRP_LOCATION_INFORMATION , ®_type, (BYTE*)&DevLocation,
sizeof(DevLocation), &size)) {
if ( (size>=6) &&
(strncmp(DevLocation,"Port_#",6)==0) )
{
port_nr = strtol(DevLocation+6,NULL,10);
}
}
```
This works around the issue by querying SPDRP_LOCATION_INFORMATION see if it's
in Port_#xxxx_Hub_#yyyy format and parses the correct port from there.
---
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