[net 02/10] net/mlx5: Fix debugfs cleanup in the device init/remove flow

[Saeed Mahameed]

From: Jack Morgenstein <ja...@dev.mellanox.co.il>

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: 59211bd3b632 ("net/mlx5: Split the load/unload flow into hardware and 
software flows")
Signed-off-by: Jack Morgenstein <ja...@dev.mellanox.co.il>
Reviewed-by: Daniel Jurgens <dani...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/main.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c 
b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 739aad0a0b35..b5e9f664fc66 100644
--- 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)
-- 
2.17.1