rt2x00: Endless loop on hub port power down

I've met an endless (or at least very long) loop if I power down the usb
port on witch a usb wifi key is plugged.
(Ok, it's not very smart to power down a usb port when a usb key is in
used... but still, I think that should not lead to an endless loop).

I have a lot of:
ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71

(-71==-EPROTO)

How to reproduce:
- plug an usb wifi key
- ip link set wlan0 up
- hub-ctrl -b usb_bus -d usb_device -P usb_port -p 0

hub-ctrl source: https://github.com/codazoda/hub-ctrl.c/blob/master/hub-ctrl.c

The following patch prevents the endless loop, but I'm really not sure
that The Right Way To Do It (R)

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00usb.c

@@ -68,6 +68,12 @@ int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
 		}
 	}
 
+	/* If the port is powered down, we get a -EPROTO error, and this
+	 * leads to a endless loop. So just say that the device is gone.
+	 */
+	if (status == -EPROTO)
+		clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
+
 	rt2x00_err(rt2x00dev,
 		   "Vendor Request 0x%02x failed for offset 0x%04x with error %d\n",
 		   request, offset, status);