[PATCH 3.16 304/366] net/mlx4_core: Fix error handling in mlx4_init_port_info.

Ben Hutchings
2018-10-14T15:25:41Z

From: Tarick Bedeir <tarick@google.com>

commit 57f6f99fdad9984801cde05c1db68fe39b474a10 upstream.

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@google.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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
@@ -2048,6 +2048,7 @@ static int mlx4_init_port_info(struct ml
if (err) {
mlx4_err(dev, "Failed to create file for port %d\n", port);
info->port = -1;
+ return err;
}

sprintf(info->dev_mtu_name, "mlx4_port%d_mtu", port);
@@ -2066,9 +2067,10 @@ static int mlx4_init_port_info(struct ml
mlx4_err(dev, "Failed to create mtu file for port %d\n", port);
device_remove_file(&info->dev->pdev->dev, &info->port_attr);
info->port = -1;
+ return err;
}

- return err;
+ return 0;
}

static void mlx4_cleanup_port_info(struct mlx4_port_info *info)