USB: UHCI: Don't test the Short Packet Detect bit

Apparently some UHCI controllers change the value of the Short Packet
Detect (SPD) bit in the TD status word -- presumably when they receive a
short packet.  This patch (as759) changes uhci-hcd to avoid assuming
that the bit is unchanged; in fact, the driver no longer looks at SPD at
all.

This fixes the second problem reported in Bugzilla #6752.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/uhci-q.c

@@ -943,7 +943,9 @@ static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb)
 			/* We received a short packet */
 			if (urb->transfer_flags & URB_SHORT_NOT_OK)
 				ret = -EREMOTEIO;
-			else if (ctrlstat & TD_CTRL_SPD)
+
+			/* Fixup needed only if this isn't the URB's last TD */
+			else if (&td->list != urbp->td_list.prev)
 				ret = 1;
 		}