iwlagn: keep BT settings across restart

The BT SCO needs to be re-applied to the device,
while the traffic load just needs to be correct
in software.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index a8a5a5b79f39..ecf7cf012679 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -3079,10 +3079,30 @@ static void iwl_bg_restart(struct work_struct *data)
                 return;
 
         if (test_and_clear_bit(STATUS_FW_ERROR, &priv->status)) {
+                bool bt_sco;
+                u8 bt_load;
+
                 mutex_lock(&priv->mutex);
                 priv->vif = NULL;
                 priv->is_open = 0;
+
+                /*
+                 * __iwl_down() will clear the BT status variables,
+                 * which is correct, but when we restart we really
+                 * want to keep them so restore them afterwards.
+                 *
+                 * The restart process will later pick them up and
+                 * re-configure the hw when we reconfigure the BT
+                 * command.
+                 */
+                bt_sco = priv->bt_sco_active;
+                bt_load = priv->bt_traffic_load;
+
                 __iwl_down(priv);
+
+                priv->bt_sco_active = bt_sco;
+                priv->bt_traffic_load = bt_load;
+
                 mutex_unlock(&priv->mutex);
                 iwl_cancel_deferred_work(priv);
                 ieee80211_restart_hw(priv->hw);