iwlwifi: cancel scan when down the device

Always cancel scan when stooping device and scan is currently pending,
we should newer have scan running after down device.

To assure we start scan cancel from restart work we have to schedule
abort_scan to different workqueue than priv->workqueue.

Patch fix not cancel scanning when restarting firmware, what is
one of the causes of wdev_cleanup_work warning (together with permanent
network connection lost) reported at
https://bugzilla.redhat.com/show_bug.cgi?id=593566

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Wey-Yi W Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -2892,8 +2892,9 @@ static void __iwl_down(struct iwl_priv *priv)
 
 	IWL_DEBUG_INFO(priv, DRV_NAME " is going down\n");
 
-	if (!exit_pending)
-		set_bit(STATUS_EXIT_PENDING, &priv->status);
+	iwl_scan_cancel_timeout(priv, 200);
+
+	exit_pending = test_and_set_bit(STATUS_EXIT_PENDING, &priv->status);
 
 	/* Stop TX queues watchdog. We need to have STATUS_EXIT_PENDING bit set
 	 * to prevent rearm timer */
@@ -3503,15 +3504,6 @@ static void iwl_mac_stop(struct ieee80211_hw *hw)
 
 	priv->is_open = 0;
 
-	if (iwl_is_ready_rf(priv) || test_bit(STATUS_SCAN_HW, &priv->status)) {
-		/* stop mac, cancel any scan request and clear
-		 * RXON_FILTER_ASSOC_MSK BIT
-		 */
-		mutex_lock(&priv->mutex);
-		iwl_scan_cancel_timeout(priv, 100);
-		mutex_unlock(&priv->mutex);
-	}
-
 	iwl_down(priv);
 
 	flush_workqueue(priv->workqueue);

drivers/net/wireless/iwlwifi/iwl-scan.c

@@ -71,7 +71,7 @@ int iwl_scan_cancel(struct iwl_priv *priv)
 	if (test_bit(STATUS_SCANNING, &priv->status)) {
 		if (!test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
 			IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n");
-			queue_work(priv->workqueue, &priv->abort_scan);
+			schedule_work(&priv->abort_scan);
 
 		} else
 			IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");

drivers/net/wireless/iwlwifi/iwl3945-base.c

@@ -2567,12 +2567,13 @@ static void iwl3945_cancel_deferred_work(struct iwl_priv *priv);
 static void __iwl3945_down(struct iwl_priv *priv)
 {
 	unsigned long flags;
-	int exit_pending = test_bit(STATUS_EXIT_PENDING, &priv->status);
+	int exit_pending;
 
 	IWL_DEBUG_INFO(priv, DRV_NAME " is going down\n");
 
-	if (!exit_pending)
-		set_bit(STATUS_EXIT_PENDING, &priv->status);
+	iwl_scan_cancel_timeout(priv, 200);
+
+	exit_pending = test_and_set_bit(STATUS_EXIT_PENDING, &priv->status);
 
 	/* Stop TX queues watchdog. We need to have STATUS_EXIT_PENDING bit set
 	 * to prevent rearm timer */
@@ -3172,15 +3173,6 @@ static void iwl3945_mac_stop(struct ieee80211_hw *hw)
 
 	priv->is_open = 0;
 
-	if (iwl_is_ready_rf(priv)) {
-		/* stop mac, cancel any scan request and clear
-		 * RXON_FILTER_ASSOC_MSK BIT
-		 */
-		mutex_lock(&priv->mutex);
-		iwl_scan_cancel_timeout(priv, 100);
-		mutex_unlock(&priv->mutex);
-	}
-
 	iwl3945_down(priv);
 
 	flush_workqueue(priv->workqueue);