vdpa/mlx5: Add and remove debugfs in setup/teardown driver

The right place to add the debugfs create is in
setup_driver() and remove it in teardown_driver().

Current code adds the debugfs when creating the device but resetting a
device will remove the debugfs subtree and subsequent set_driver will
not be able to create the files since the debugfs pointer is NULL.

Fixes: 294221004322 ("vdpa/mlx5: Add debugfs subtree")
Signed-off-by: Eli Cohen <elic@nvidia.com>
v3 -> v4:
Fix error flow in setup_driver()
Message-Id: <20230403114039.11102-1-elic@nvidia.com>

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 520646a..195963b 100644 (file)
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -2467,10 +2467,11 @@ static int setup_driver(struct mlx5_vdpa_dev *mvdev)
                err = 0;
                goto out;
        }
+       mlx5_vdpa_add_debugfs(ndev);
        err = setup_virtqueues(mvdev);
        if (err) {
                mlx5_vdpa_warn(mvdev, "setup_virtqueues\n");
-               goto out;
+               goto err_setup;
        }
 
        err = create_rqt(ndev);
@@ -2500,6 +2501,8 @@ err_tir:
        destroy_rqt(ndev);
 err_rqt:
        teardown_virtqueues(ndev);
+err_setup:
+       mlx5_vdpa_remove_debugfs(ndev->debugfs);
 out:
        return err;
 }
@@ -2513,6 +2516,8 @@ static void teardown_driver(struct mlx5_vdpa_net *ndev)
        if (!ndev->setup)
                return;
 
+       mlx5_vdpa_remove_debugfs(ndev->debugfs);
+       ndev->debugfs = NULL;
        teardown_steering(ndev);
        destroy_tir(ndev);
        destroy_rqt(ndev);
@@ -3261,7 +3266,6 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
        if (err)
                goto err_reg;
 
-       mlx5_vdpa_add_debugfs(ndev);
        mgtdev->ndev = ndev;
        return 0;