IB/iser: Release connection resources on RDMA_CM_EVENT_DEVICE_REMOVAL event

When a RDMA_CM_EVENT_DEVICE_REMOVAL event is raised, iSER should
release the connection resources.

This is necessary when the IB HCA module is unloaded while open-iscsi
is still running.  Currently, iSER just BUG()s.
Signed-off-by: NErez Zilber <erezz@voltaire.com>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>

drivers/infiniband/ulp/iser/iser_verbs.c

@@ -473,11 +473,8 @@ static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *eve
 		iser_connect_error(cma_id);
 		break;
 	case RDMA_CM_EVENT_DISCONNECTED:
-		iser_disconnected_handler(cma_id);
-		break;
 	case RDMA_CM_EVENT_DEVICE_REMOVAL:
-		iser_err("Device removal is currently unsupported\n");
-		BUG();
+		iser_disconnected_handler(cma_id);
 		break;
 	default:
 		iser_err("Unexpected RDMA CM event (%d)\n", event->event);