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[net-next,01/15] mlxsw: spectrum_router: Nullify nexthop's neigh pointer

Message ID 1486549002-2056-2-git-send-email-jiri@resnulli.us
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Jiri Pirko Feb. 8, 2017, 10:16 a.m. UTC 
From: Ido Schimmel <idosch@mellanox.com>

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>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index b19f69f..31680de 100644
--- 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);