rt2x00: Fix rt2x00lib_reset_link_tuner()

rt2x00lib_reset_link_tuner() can be called from within
the link tuner itself. This means that it should
_not_ call rt2x00lib_stop_link_tuner() since that will
cause the thread to hang.

Reorder the things that should be done during a
link tuner reset and during a link tuner start.

Also make antenna tuning the last step of the link
tuner since it could possibly reset some statistical
information which we need for average calculation.

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

1 files changed, 30 insertions, 19 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 7294c75272d0..0d51f478bcdf 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -61,11 +61,33 @@ EXPORT_SYMBOL_GPL(rt2x00lib_get_ring);
 /*
  * Link tuning handlers
  */
-static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
+void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
 {
+        if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
+                return;
+
+        /*
+         * Reset link information.
+         * Both the currently active vgc level as well as
+         * the link tuner counter should be reset. Resetting
+         * the counter is important for devices where the
+         * device should only perform link tuning during the
+         * first minute after being enabled.
+         */
         rt2x00dev->link.count = 0;
         rt2x00dev->link.vgc_level = 0;
 
+        /*
+         * Reset the link tuner.
+         */
+        rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
+}
+
+static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
+{
+        /*
+         * Clear all (possibly) pre-existing quality statistics.
+         */
         memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
 
         /*
@@ -79,10 +101,7 @@ static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
         rt2x00dev->link.qual.rx_percentage = 50;
         rt2x00dev->link.qual.tx_percentage = 50;
 
-        /*
-         * Reset the link tuner.
-         */
-        rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
+        rt2x00lib_reset_link_tuner(rt2x00dev);
 
         queue_delayed_work(rt2x00dev->hw->workqueue,
                            &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
@@ -93,15 +112,6 @@ static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
         cancel_delayed_work_sync(&rt2x00dev->link.work);
 }
 
-void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
-{
-        if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
-                return;
-
-        rt2x00lib_stop_link_tuner(rt2x00dev);
-        rt2x00lib_start_link_tuner(rt2x00dev);
-}
-
 /*
  * Ring initialization
  */
@@ -433,17 +443,18 @@ static void rt2x00lib_link_tuner(struct work_struct *work)
                 rt2x00dev->ops->lib->link_tuner(rt2x00dev);
 
         /*
-         * Evaluate antenna setup.
-         */
-        rt2x00lib_evaluate_antenna(rt2x00dev);
-
-        /*
          * Precalculate a portion of the link signal which is
          * in based on the tx/rx success/failure counters.
          */
         rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
 
         /*
+         * Evaluate antenna setup, make this the last step since this could
+         * possibly reset some statistics.
+         */
+        rt2x00lib_evaluate_antenna(rt2x00dev);
+
+        /*
          * Increase tuner counter, and reschedule the next link tuner run.
          */
         rt2x00dev->link.count++;