mlxsw: spectrum_router: Nullify nexthop's neigh pointer

When we invalidate a nexthop we should also invalidate its neighbour
entry pointer as it might be destroyed later on. This makes the nexthop
de-init function symmetric with its init and also ensures nobody will
try to access the neighbour entry.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index b19f69f..31680de 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -1398,12 +1398,13 @@ static void mlxsw_sp_nexthop_fini(struct mlxsw_sp *mlxsw_sp,
 
        __mlxsw_sp_nexthop_neigh_update(nh, true);
        list_del(&nh->neigh_list_node);
+       nh->neigh_entry = NULL;
 
        /* If that is the last nexthop connected to that neigh, remove from
         * nexthop_neighs_list
         */
-       if (list_empty(&nh->neigh_entry->nexthop_list))
-               list_del(&nh->neigh_entry->nexthop_neighs_list_node);
+       if (list_empty(&neigh_entry->nexthop_list))
+               list_del(&neigh_entry->nexthop_neighs_list_node);
 
        if (!neigh_entry->connected && list_empty(&neigh_entry->nexthop_list))
                mlxsw_sp_neigh_entry_destroy(mlxsw_sp, neigh_entry);