[PATCH 4.18 013/235] net/mlx5: Fix not releasing read lock when adding flow rules

[Greg Kroah-Hartman]

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Roi Dayan <r...@mellanox.com>

[ Upstream commit 071304772fc747d5df13c51f1cf48a4b922a5e0d ]

If building match list fg fails and we never jumped to
search_again_locked label then the function returned without
unlocking the read lock.

Fixes: bd71b08ec2ee ("net/mlx5: Support multiple updates of steering rules in 
parallel")
Signed-off-by: Roi Dayan <r...@mellanox.com>
Reviewed-by: Maor Gottlieb <ma...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/fs_core.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
@@ -1797,6 +1797,8 @@ search_again_locked:
        if (err) {
                if (take_write)
                        up_write_ref_node(&ft->node);
+               else
+                       up_read_ref_node(&ft->node);
                return ERR_PTR(err);
        }