Merge branch 'mlxsw-Couple-of-fixes'

Ido Schimmel says:

====================
mlxsw: Couple of fixes

First patch makes sure mlxsw does not ignore user requests to delete FDB
entries that were learned by the device.

Second patch fixes a use-after-free that can be triggered by requesting
a reload via devlink when the previous reload failed.

Please consider both patches for stable. They apply cleanly to both
4.18.y and 4.19.y.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

Author: davem330

drivers/net/ethernet/mellanox/mlxsw/core.c

@@ -943,8 +943,8 @@ static int mlxsw_devlink_core_bus_device_reload(struct devlink *devlink,
 					     mlxsw_core->bus,
 					     mlxsw_core->bus_priv, true,
 					     devlink);
-	if (err)
-		mlxsw_core->reload_fail = true;
+	mlxsw_core->reload_fail = !!err;
+
 	return err;
 }
 
@@ -1083,8 +1083,15 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core,
 {
 	struct devlink *devlink = priv_to_devlink(mlxsw_core);
 
-	if (mlxsw_core->reload_fail)
-		goto reload_fail;
+	if (mlxsw_core->reload_fail) {
+		if (!reload)
+			/* Only the parts that were not de-initialized in the
+			 * failed reload attempt need to be de-initialized.
+			 */
+			goto reload_fail_deinit;
+		else
+			return;
+	}
 
 	if (mlxsw_core->driver->fini)
 		mlxsw_core->driver->fini(mlxsw_core);
@@ -1098,9 +1105,12 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core,
 	if (!reload)
 		devlink_resources_unregister(devlink, NULL);
 	mlxsw_core->bus->fini(mlxsw_core->bus_priv);
-	if (reload)
-		return;
-reload_fail:
+
+	return;
+
+reload_fail_deinit:
+	devlink_unregister(devlink);
+	devlink_resources_unregister(devlink, NULL);
 	devlink_free(devlink);
 }
 EXPORT_SYMBOL(mlxsw_core_bus_device_unregister);

drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c

@@ -2661,8 +2661,6 @@ static void mlxsw_sp_switchdev_bridge_fdb_event_work(struct work_struct *work)
 		break;
 	case SWITCHDEV_FDB_DEL_TO_DEVICE:
 		fdb_info = &switchdev_work->fdb_info;
-		if (!fdb_info->added_by_user)
-			break;
 		mlxsw_sp_port_fdb_set(mlxsw_sp_port, fdb_info, false);
 		break;
 	case SWITCHDEV_FDB_ADD_TO_BRIDGE: /* fall through */