iwlwifi: fix canceling monitor_recover timer

To make del_timer_sync() works we have to assure that timer function
does not rearm the timer. To achieve that we cancel timer with
STATUS_EXIT_PENDING bit set in __iwl{3945,}_down function.

Patch also fix priv->txq memory usage after free for iwl3945, because
it move timer cancellation before iwl3945_hw_txq_ctx_free(priv) is called.
Signed-off-by: NStanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

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

@@ -2764,6 +2764,11 @@ static void __iwl_down(struct iwl_priv *priv)
 	if (!exit_pending)
 		set_bit(STATUS_EXIT_PENDING, &priv->status);
 
+	/* Stop TX queues watchdog. We need to have STATUS_EXIT_PENDING bit set
+	 * to prevent rearm timer */
+	if (priv->cfg->ops->lib->recover_from_tx_stall)
+		del_timer_sync(&priv->monitor_recover);
+
 	iwl_clear_ucode_stations(priv);
 	iwl_dealloc_bcast_station(priv);
 	iwl_clear_driver_stations(priv);
@@ -3870,8 +3875,6 @@ static void iwl_cancel_deferred_work(struct iwl_priv *priv)
 	cancel_work_sync(&priv->beacon_update);
 	del_timer_sync(&priv->statistics_periodic);
 	del_timer_sync(&priv->ucode_trace);
-	if (priv->cfg->ops->lib->recover_from_tx_stall)
-		del_timer_sync(&priv->monitor_recover);
 }
 
 static void iwl_init_hw_rates(struct iwl_priv *priv,

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

@@ -2571,6 +2571,11 @@ static void __iwl3945_down(struct iwl_priv *priv)
 	if (!exit_pending)
 		set_bit(STATUS_EXIT_PENDING, &priv->status);
 
+	/* Stop TX queues watchdog. We need to have STATUS_EXIT_PENDING bit set
+	 * to prevent rearm timer */
+	if (priv->cfg->ops->lib->recover_from_tx_stall)
+		del_timer_sync(&priv->monitor_recover);
+
 	/* Station information will now be cleared in device */
 	iwl_clear_ucode_stations(priv);
 	iwl_dealloc_bcast_station(priv);
@@ -3811,8 +3816,6 @@ static void iwl3945_cancel_deferred_work(struct iwl_priv *priv)
 	cancel_delayed_work(&priv->alive_start);
 	cancel_work_sync(&priv->start_internal_scan);
 	cancel_work_sync(&priv->beacon_update);
-	if (priv->cfg->ops->lib->recover_from_tx_stall)
-		del_timer_sync(&priv->monitor_recover);
 }
 
 static struct attribute *iwl3945_sysfs_entries[] = {