RDMA/nes: Don't generate async events for unregistered devices

nes_port_ibevent() should not be called when the nes RDMA device is not
registered with the RDMA core.  Add missing checks of of_device_registered flag.
Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/hw/nes/nes_hw.c

@@ -2610,10 +2610,12 @@ static void nes_process_mac_intr(struct nes_device *nesdev, u32 mac_number)
 					netif_carrier_on(nesvnic->netdev);
 
 					spin_lock(&nesvnic->port_ibevent_lock);
+					if (nesvnic->of_device_registered) {
 						if (nesdev->iw_status == 0) {
 							nesdev->iw_status = 1;
 							nes_port_ibevent(nesvnic);
 						}
+					}
 					spin_unlock(&nesvnic->port_ibevent_lock);
 				}
 			}
@@ -2642,10 +2644,12 @@ static void nes_process_mac_intr(struct nes_device *nesdev, u32 mac_number)
 					netif_carrier_off(nesvnic->netdev);
 
 					spin_lock(&nesvnic->port_ibevent_lock);
+					if (nesvnic->of_device_registered) {
 						if (nesdev->iw_status == 1) {
 							nesdev->iw_status = 0;
 							nes_port_ibevent(nesvnic);
 						}
+					}
 					spin_unlock(&nesvnic->port_ibevent_lock);
 				}
 			}
@@ -2703,10 +2707,12 @@ void nes_recheck_link_status(struct work_struct *work)
 				netif_carrier_on(nesvnic->netdev);
 
 				spin_lock(&nesvnic->port_ibevent_lock);
+				if (nesvnic->of_device_registered) {
 					if (nesdev->iw_status == 0) {
 						nesdev->iw_status = 1;
 						nes_port_ibevent(nesvnic);
 					}
+				}
 				spin_unlock(&nesvnic->port_ibevent_lock);
 			}
 		}
@@ -2723,10 +2729,12 @@ void nes_recheck_link_status(struct work_struct *work)
 				netif_carrier_off(nesvnic->netdev);
 
 				spin_lock(&nesvnic->port_ibevent_lock);
+				if (nesvnic->of_device_registered) {
 					if (nesdev->iw_status == 1) {
 						nesdev->iw_status = 0;
 						nes_port_ibevent(nesvnic);
 					}
+				}
 				spin_unlock(&nesvnic->port_ibevent_lock);
 			}
 		}