IPoIB: Handle client reregister events

Handle client reregister events by treating them just like LID or
SM changes -- flush all cached paths and rejoin multicast groups.

Signed-off-by: Leonid Arsh <[e-mail]>
Signed-off-by: Roland Dreier <[e-mail]>

drivers/infiniband/ulp/ipoib/ipoib_verbs.c

···
 	    record->event == IB_EVENT_PKEY_CHANGE ||
 	    record->event == IB_EVENT_PORT_ACTIVE ||
 	    record->event == IB_EVENT_LID_CHANGE  ||
-	    record->event == IB_EVENT_SM_CHANGE) {
+	    record->event == IB_EVENT_SM_CHANGE   ||
+	    record->event == IB_EVENT_CLIENT_REREGISTER) {
 		ipoib_dbg(priv, "Port state change event\n");
 		queue_work(ipoib_workqueue, &priv->flush_task);
 	}