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, 4 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index 34b8a887831b..9957579248c4 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -458,13 +458,14 @@ static bool rt2x00usb_flush_entry(struct queue_entry *entry, void* data)
         return false;
 }
 
-void rt2x00usb_flush_queue(struct data_queue *queue)
+void rt2x00usb_flush_queue(struct data_queue *queue, bool drop)
 {
         struct work_struct *completion;
         unsigned int i;
 
-        rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
-                                   rt2x00usb_flush_entry);
+        if (drop)
+                rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
+                                           rt2x00usb_flush_entry);
 
         /*
          * Obtain the queue completion handler
@@ -483,7 +484,7 @@ void rt2x00usb_flush_queue(struct data_queue *queue)
                 return;
         }
 
-        for (i = 0; i < 20; i++) {
+        for (i = 0; i < 10; i++) {
                 /*
                  * Check if the driver is already done, otherwise we
                  * have to sleep a little while to give the driver/hw