rt2x00usb: fix indexes ordering on RX queue kick

On rt2x00_dmastart() we increase index specified by Q_INDEX and on rt2x00_dmadone() we increase index specified by Q_INDEX_DONE. So entries between Q_INDEX_DONE and Q_INDEX are those we currently process in the hardware. Entries between Q_INDEX and Q_INDEX_DONE are those we can submit to the hardware.

According to that fix rt2x00usb_kick_queue(), as we need to submit RX entries that are not processed by the hardware. It worked before only for empty queue, otherwise was broken.

Note that for TX queues indexes ordering are ok. We need to kick entries that have filled skb, but was not submitted to the hardware, i.e. started from Q_INDEX_DONE and have ENTRY_DATA_PENDING bit set.

in AP mode, like for example reported here:
https://bugzilla.redhat.com/show_bug.cgi?id=828824

---
 drivers/net/wireless/rt2x00/rt2x00usb.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index d357d1e..74ecc33 100644
@@ -436,8 +436,8 @@ void rt2x00usb_kick_queue(struct data_queue *queue)
 	case QID_RX:
 		if (!rt2x00queue_full(queue))
 			rt2x00queue_for_each_entry(queue,
-						   Q_INDEX_DONE,
 						   Q_INDEX,
+						   Q_INDEX_DONE,
 						   NULL,
 						   rt2x00usb_kick_rx_entry);
 		break;

1.7.1