[PATCH net] mlxsw: spectrum_acl: Fix mlxsw_sp_acl_tcam_group_add()'s error path

[Ido Schimmel]

From: Ido Schimmel <ido...@nvidia.com>

If mlxsw_sp_acl_tcam_group_id_get() fails, the mutex initialized earlier
is not destroyed.

Fix this by initializing the mutex after calling the function. This is
symmetric to mlxsw_sp_acl_tcam_group_del().

Fixes: 5ec2ee28d27b ("mlxsw: spectrum_acl: Introduce a mutex to guard region 
list updates")
Signed-off-by: Ido Schimmel <ido...@nvidia.com>
Reviewed-by: Jiri Pirko <j...@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
index 5c020403342f..7cccc41dd69c 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
@@ -292,13 +292,14 @@ mlxsw_sp_acl_tcam_group_add(struct mlxsw_sp_acl_tcam 
*tcam,
        int err;
 
        group->tcam = tcam;
-       mutex_init(&group->lock);
        INIT_LIST_HEAD(&group->region_list);
 
        err = mlxsw_sp_acl_tcam_group_id_get(tcam, &group->id);
        if (err)
                return err;
 
+       mutex_init(&group->lock);
+
        return 0;
 }
 
-- 
2.26.2