[net 11/11] net/mlx5: Fix error handling when adding flow rules

[Saeed Mahameed]

From: Vlad Buslov <vla...@mellanox.com>

If building match list or adding existing fg fails when
node is locked, function returned without unlocking it.
This happened if node version changed or adding existing fg
returned with EAGAIN after jumping to search_again_locked label.

Fixes: bd71b08ec2ee ("net/mlx5: Support multiple updates of steering rules in 
parallel")
Signed-off-by: Vlad Buslov <vla...@mellanox.com>
Reviewed-by: Maor Gottlieb <ma...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/fs_core.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c 
b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
index 6caa4a7ad869..31fc2cfac3b3 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
@@ -1759,8 +1759,11 @@ _mlx5_add_flow_rules(struct mlx5_flow_table *ft,
 
        /* Collect all fgs which has a matching match_criteria */
        err = build_match_list(&match_head, ft, spec);
-       if (err)
+       if (err) {
+               if (take_write)
+                       up_write_ref_node(&ft->node);
                return ERR_PTR(err);
+       }
 
        if (!take_write)
                up_read_ref_node(&ft->node);
@@ -1769,8 +1772,11 @@ _mlx5_add_flow_rules(struct mlx5_flow_table *ft,
                                      dest_num, version);
        free_match_list(&match_head);
        if (!IS_ERR(rule) ||
-           (PTR_ERR(rule) != -ENOENT && PTR_ERR(rule) != -EAGAIN))
+           (PTR_ERR(rule) != -ENOENT && PTR_ERR(rule) != -EAGAIN)) {
+               if (take_write)
+                       up_write_ref_node(&ft->node);
                return rule;
+       }
 
        if (!take_write) {
                nested_down_write_ref_node(&ft->node, FS_LOCK_GRANDPARENT);
-- 
2.14.3