Merge branch 'mlxsw-three-m-router-fixes'

Petr Machata says:

====================
mlxsw: Three (m)router fixes

This patchset contains two fixes in mlxsw Spectrum router code, and one for
the Spectrum multicast router code. Please see the individual patches for
more details.
====================

Link: https://patch.msgid.link/cover.1764695650.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: kuba-moo

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

@@ -440,7 +440,9 @@ int mlxsw_sp_mr_route_add(struct mlxsw_sp_mr_table *mr_table,
 		rhashtable_remove_fast(&mr_table->route_ht,
 				       &mr_orig_route->ht_node,
 				       mlxsw_sp_mr_route_ht_params);
+		mutex_lock(&mr_table->route_list_lock);
 		list_del(&mr_orig_route->node);
+		mutex_unlock(&mr_table->route_list_lock);
 		mlxsw_sp_mr_route_destroy(mr_table, mr_orig_route);
 	}
 

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

@@ -2265,6 +2265,7 @@ mlxsw_sp_neigh_entry_alloc(struct mlxsw_sp *mlxsw_sp, struct neighbour *n,
 	if (!neigh_entry)
 		return NULL;
 
+	neigh_hold(n);
 	neigh_entry->key.n = n;
 	neigh_entry->rif = rif;
 	INIT_LIST_HEAD(&neigh_entry->nexthop_list);
@@ -2274,6 +2275,7 @@ mlxsw_sp_neigh_entry_alloc(struct mlxsw_sp *mlxsw_sp, struct neighbour *n,
 
 static void mlxsw_sp_neigh_entry_free(struct mlxsw_sp_neigh_entry *neigh_entry)
 {
+	neigh_release(neigh_entry->key.n);
 	kfree(neigh_entry);
 }
 
@@ -2858,6 +2860,11 @@ static int mlxsw_sp_router_schedule_work(struct net *net,
 	if (!net_work)
 		return NOTIFY_BAD;
 
+	/* Take a reference to ensure the neighbour won't be destructed until
+	 * we drop the reference in the work item.
+	 */
+	neigh_clone(n);
+
 	INIT_WORK(&net_work->work, cb);
 	net_work->mlxsw_sp = router->mlxsw_sp;
 	net_work->n = n;
@@ -2881,11 +2888,6 @@ static int mlxsw_sp_router_schedule_neigh_work(struct mlxsw_sp_router *router,
 	struct net *net;
 
 	net = neigh_parms_net(n->parms);
-
-	/* Take a reference to ensure the neighbour won't be destructed until we
-	 * drop the reference in delayed work.
-	 */
-	neigh_clone(n);
 	return mlxsw_sp_router_schedule_work(net, router, n,
 					     mlxsw_sp_router_neigh_event_work);
 }
@@ -4320,6 +4322,8 @@ mlxsw_sp_nexthop_dead_neigh_replace(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		goto err_neigh_entry_insert;
 
+	neigh_release(old_n);
+
 	read_lock_bh(&n->lock);
 	nud_state = n->nud_state;
 	dead = n->dead;
@@ -4328,14 +4332,10 @@ mlxsw_sp_nexthop_dead_neigh_replace(struct mlxsw_sp *mlxsw_sp,
 
 	list_for_each_entry(nh, &neigh_entry->nexthop_list,
 			    neigh_list_node) {
-		neigh_release(old_n);
-		neigh_clone(n);
 		__mlxsw_sp_nexthop_neigh_update(nh, !entry_connected);
 		mlxsw_sp_nexthop_group_refresh(mlxsw_sp, nh->nhgi->nh_grp);
 	}
 
-	neigh_release(n);
-
 	return 0;
 
 err_neigh_entry_insert:
@@ -4428,6 +4428,11 @@ static int mlxsw_sp_nexthop_neigh_init(struct mlxsw_sp *mlxsw_sp,
 		}
 	}
 
+	/* Release the reference taken by neigh_lookup() / neigh_create() since
+	 * neigh_entry already holds one.
+	 */
+	neigh_release(n);
+
 	/* If that is the first nexthop connected to that neigh, add to
 	 * nexthop_neighs_list
 	 */
@@ -4454,11 +4459,9 @@ static void mlxsw_sp_nexthop_neigh_fini(struct mlxsw_sp *mlxsw_sp,
 					struct mlxsw_sp_nexthop *nh)
 {
 	struct mlxsw_sp_neigh_entry *neigh_entry = nh->neigh_entry;
-	struct neighbour *n;
 
 	if (!neigh_entry)
 		return;
-	n = neigh_entry->key.n;
 
 	__mlxsw_sp_nexthop_neigh_update(nh, true);
 	list_del(&nh->neigh_list_node);
@@ -4472,8 +4475,6 @@ static void mlxsw_sp_nexthop_neigh_fini(struct mlxsw_sp *mlxsw_sp,
 
 	if (!neigh_entry->connected && list_empty(&neigh_entry->nexthop_list))
 		mlxsw_sp_neigh_entry_destroy(mlxsw_sp, neigh_entry);
-
-	neigh_release(n);
 }
 
 static bool mlxsw_sp_ipip_netdev_ul_up(struct net_device *ol_dev)