[PATCH 4.16 003/161] net/mlx4_core: Fix error handling in mlx4_init_port_info.

[Greg Kroah-Hartman]

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

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

From: Tarick Bedeir <tarick@xxxxxxxxxx>

[ Upstream commit 57f6f99fdad9984801cde05c1db68fe39b474a10 ]

Avoid exiting the function with a lingering sysfs file (if the first
call to device_create_file() fails while the second succeeds), and avoid
calling devlink_port_unregister() twice.

In other words, either mlx4_init_port_info() succeeds and returns zero, or
it fails, returns non-zero, and requires no cleanup.

Fixes: 096335b3f983 ("mlx4_core: Allow dynamic MTU configuration for IB ports")
Signed-off-by: Tarick Bedeir <tarick@xxxxxxxxxx>
Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Reviewed-by: Tariq Toukan <tariqt@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/mellanox/mlx4/main.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -3007,6 +3007,7 @@ static int mlx4_init_port_info(struct ml
 		mlx4_err(dev, "Failed to create file for port %d\n", port);
 		devlink_port_unregister(&info->devlink_port);
 		info->port = -1;
+		return err;
 	}
 
 	sprintf(info->dev_mtu_name, "mlx4_port%d_mtu", port);
@@ -3028,9 +3029,10 @@ static int mlx4_init_port_info(struct ml
 				   &info->port_attr);
 		devlink_port_unregister(&info->devlink_port);
 		info->port = -1;
+		return err;
 	}
 
-	return err;
+	return 0;
 }
 
 static void mlx4_cleanup_port_info(struct mlx4_port_info *info)