[PATCH 5.6 033/177] net/mlx5: Fix cleaning unmanaged flow tables

[Greg Kroah-Hartman]

From: Roi Dayan <roid@xxxxxxxxxxxx>

[ Upstream commit aee37f3d940ca732df71c3df49347bccaafc0b24 ]

Unmanaged flow tables doesn't have a parent and tree_put_node()
assume there is always a parent if cleaning is needed. fix that.

Fixes: 5281a0c90919 ("net/mlx5: fs_core: Introduce unmanaged flow tables")
Signed-off-by: Roi Dayan <roid@xxxxxxxxxxxx>
Reviewed-by: Mark Bloch <markb@xxxxxxxxxxxx>
Reviewed-by: Paul Blakey <paulb@xxxxxxxxxxxx>
Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/mellanox/mlx5/core/fs_core.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
@@ -323,14 +323,13 @@ static void tree_put_node(struct fs_node
 		if (node->del_hw_func)
 			node->del_hw_func(node);
 		if (parent_node) {
-			/* Only root namespace doesn't have parent and we just
-			 * need to free its node.
-			 */
 			down_write_ref_node(parent_node, locked);
 			list_del_init(&node->list);
 			if (node->del_sw_func)
 				node->del_sw_func(node);
 			up_write_ref_node(parent_node, locked);
+		} else if (node->del_sw_func) {
+			node->del_sw_func(node);
 		} else {
 			kfree(node);
 		}
@@ -447,8 +446,10 @@ static void del_sw_flow_table(struct fs_
 	fs_get_obj(ft, node);
 
 	rhltable_destroy(&ft->fgs_hash);
-	fs_get_obj(prio, ft->node.parent);
-	prio->num_ft--;
+	if (ft->node.parent) {
+		fs_get_obj(prio, ft->node.parent);
+		prio->num_ft--;
+	}
 	kfree(ft);
 }