[PATCH] IB/sa_query: avoid unnecessary list scan

Using ib_get_client_data in SA event handler performs a list scan.
It's better to use container_of to get the sa device directly.

Signed-off-by: Michael S. Tsirkin <[e-mail]>
Signed-off-by: Roland Dreier <[e-mail]>

drivers/infiniband/core/sa_query.c

···
 	    event->event == IB_EVENT_LID_CHANGE  ||
 	    event->event == IB_EVENT_PKEY_CHANGE ||
 	    event->event == IB_EVENT_SM_CHANGE) {
-		struct ib_sa_device *sa_dev =
-			ib_get_client_data(event->device, &sa_client);
+		struct ib_sa_device *sa_dev;
+		sa_dev = container_of(handler, typeof(*sa_dev), event_handler);
 
 		schedule_work(&sa_dev->port[event->element.port_num -
 					    sa_dev->start_port].update_task);