[PATCH v2] net/mlx4_core: Fix error handling in mlx4_init_port_info.

[Tarick Bedeir]

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 <tar...@google.com>
---
v1 -> v2: Added "Fixes" tag.
---
 drivers/net/ethernet/mellanox/mlx4/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c 
b/drivers/net/ethernet/mellanox/mlx4/main.c
index 4d84cab77105..e8a3a45d0b53 100644
--- 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 mlx4_dev *dev, int 
port)
                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 mlx4_dev *dev, int 
port)
                                   &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)
-- 
2.17.0.441.gb46fe60e1d-goog