iwlwifi: implement switching iftype while up

Implement switching the interface while an
interface is up in iwlwifi. Interfaces have
to stay on the context they were created on.

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>
diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.c b/drivers/net/wireless/iwlwifi/iwl-4965.c
index 8f07964..6d313c8 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.c
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.c
@@ -2589,6 +2589,7 @@
 	.stop = iwlagn_mac_stop,
 	.add_interface = iwl_mac_add_interface,
 	.remove_interface = iwl_mac_remove_interface,
+	.change_interface = iwl_mac_change_interface,
 	.config = iwl_legacy_mac_config,
 	.configure_filter = iwlagn_configure_filter,
 	.set_key = iwlagn_mac_set_key,