* Re: [PATCH] vdpa/mlx5: Add and remove debugfs in setup/teardown driver
[not found] <20230326131819.783581-1-elic@nvidia.com>
@ 2023-03-27 13:36 ` Michael S. Tsirkin
0 siblings, 0 replies; only message in thread
From: Michael S. Tsirkin @ 2023-03-27 13:36 UTC (permalink / raw)
To: Eli Cohen; +Cc: eperezma, parav, virtualization
On Sun, Mar 26, 2023 at 04:18:19PM +0300, Eli Cohen wrote:
> The right place to add the debufs create is in
s/debufs/debugfs/
> 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>
> ---
> drivers/vdpa/mlx5/net/mlx5_vnet.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 2805d58378fb..d012732e3835 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -2547,6 +2547,7 @@ 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");
> @@ -2593,6 +2594,8 @@ 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);
> @@ -3313,7 +3316,6 @@ 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;
>
> --
> 2.38.1
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