rt2x00: Decrease association time for USB devices

When powersaving is enabled, assocaition times are very high
(for WPA2 networks, the time can easily be around the 3 seconds).

This is caused, because the flushing of the queues takes
too much time. Without the flushing callback mac80211 assumes
a timeout of 100ms while scanning. Limit all flush waiting
loops to the same maximum.

We can apply this maximum by passing the drop status to the
driver, which makes sure the driver performs extra actions
during the waiting for the queue to become empty.

After these changes, association times fall within the
healthy range of ~0.6 seconds with powersaving enabled.
The difference between association time between powersaving
enabled and disabled is now only ~0.1 second (which can also
be due to the measuring method).

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.h b/drivers/net/wireless/rt2x00/rt2x00usb.h
index e3faca6d2a4..6aeba71b665 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.h
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.h
@@ -404,11 +404,13 @@ void rt2x00usb_kick_queue(struct data_queue *queue);
 /**
  * rt2x00usb_flush_queue - Flush data queue
  * @queue: Data queue to stop
+ * @drop: True to drop all pending frames.
  *
- * This will walk through all entries of the queue and kill all
- * URB's which were send to the device.
+ * This will walk through all entries of the queue and will optionally
+ * kill all URB's which were send to the device, or at least wait until
+ * they have been returned from the device..
  */
-void rt2x00usb_flush_queue(struct data_queue *queue);
+void rt2x00usb_flush_queue(struct data_queue *queue, bool drop);
 
 /**
  * rt2x00usb_watchdog - Watchdog for USB communication