net/mlx5: Fix debugfs cleanup in the device init/remove flow

When initializing the device (procedure init_one), the driver
calls mlx5_pci_init to perform pci initialization. As part of this
initialization, mlx5_pci_init creates a debugfs directory.
If this creation fails, init_one aborts, returning failure to
the caller (which is the probe method caller).

The main reason for such a failure to occur is if the debugfs
directory already exists. This can happen if the last time
mlx5_pci_close was called, debugfs_remove (silently) failed due
to the debugfs directory not being empty.

Guarantee that such a debugfs_remove failure will not occur by
instead calling debugfs_remove_recursive in procedure mlx5_pci_close.

Fixes: f6e8274b2c17 ("net/mlx5: Split the load/unload flow into hardware and software flows")
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 739aad0a0b35ed6f8f938558b9812b939fd42c07..b5e9f664fc66758d5642b18e2396503baf351415 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -878,8 +878,10 @@ static int mlx5_pci_init(struct mlx5_core_dev *dev, struct mlx5_priv *priv)
        priv->numa_node = dev_to_node(&dev->pdev->dev);
 
        priv->dbg_root = debugfs_create_dir(dev_name(&pdev->dev), mlx5_debugfs_root);
-       if (!priv->dbg_root)
+       if (!priv->dbg_root) {
+               dev_err(&pdev->dev, "Cannot create debugfs dir, aborting\n");
                return -ENOMEM;
+       }
 
        err = mlx5_pci_enable_device(dev);
        if (err) {
@@ -928,7 +930,7 @@ static void mlx5_pci_close(struct mlx5_core_dev *dev, struct mlx5_priv *priv)
        pci_clear_master(dev->pdev);
        release_bar(dev->pdev);
        mlx5_pci_disable_device(dev);
-       debugfs_remove(priv->dbg_root);
+       debugfs_remove_recursive(priv->dbg_root);
 }
 
 static int mlx5_init_once(struct mlx5_core_dev *dev, struct mlx5_priv *priv)