Reading through a recent bug report [1], Alan notes:
  "Dan, the warning message in hub_suspend() should mention that the
   child device isn't suspended yet."
...update the warning from:
  "usb usb3-port4: not suspended yet"
...to:
   "usb usb3-port4: device 3-4: not suspended yet"
[1]: http://marc.info/?l=linux-usb&m=
140290586301336&w=2
Reported-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
                struct usb_device *udev = port_dev->child;
 
                if (udev && udev->can_submit) {
-                       dev_warn(&port_dev->dev, "not suspended yet\n");
+                       dev_warn(&port_dev->dev, "device %s not suspended yet\n",
+                                       dev_name(&udev->dev));
                        if (PMSG_IS_AUTO(msg))
                                return -EBUSY;
                }