This patch appears not to be in 2.5.32, but applies cleanly.

The following patch fixes 3 problems in USB:

1. Don't pci_map buffers when we know we're not going to pass them
   to a device.

   This was first noticed on ARM (no surprises here); the root hub
   code, rh_call_control(), placed data into the buffer and then
   called usb_hcd_giveback_urb().  This function called
   pci_unmap_single() on this region which promptly destroyed the
   data that rh_call_control() had placed there.  This lead to a
   corrupted device descriptor and the "too many configurations"
   message.

2. If controller->hcca is NULL, don't try to dereference it.

3. If we free the root hub (in ohci-hcd.c or uhci-hcd.c), don't
   leave a dangling pointer around to trip us up in usb_disconnect().
   EHCI appears to get this right.