netdev - Re: [PATCH] vdpa/mlx5: Extract correct pointer from driver data

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Message-ID: <YCtnxyTHJl9TU87L@unreal>
Date:   Tue, 16 Feb 2021 08:35:51 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Eli Cohen <elic@...dia.com>
Cc:     mst@...hat.com, jasowang@...hat.com, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        si-wei.liu@...cle.com
Subject: Re: [PATCH] vdpa/mlx5: Extract correct pointer from driver data

On Tue, Feb 16, 2021 at 07:50:22AM +0200, Eli Cohen wrote:
> struct mlx5_vdpa_net pointer was stored in drvdata. Extract it as well
> in mlx5v_remove().
>
> Fixes: 74c9729dd892 ("vdpa/mlx5: Connect mlx5_vdpa to auxiliary bus")
> Signed-off-by: Eli Cohen <elic@...dia.com>
> ---
>  drivers/vdpa/mlx5/net/mlx5_vnet.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 6b0a42183622..4103d3b64a2a 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -2036,9 +2036,9 @@ static int mlx5v_probe(struct auxiliary_device *adev,
>
>  static void mlx5v_remove(struct auxiliary_device *adev)
>  {
> -	struct mlx5_vdpa_dev *mvdev = dev_get_drvdata(&adev->dev);
> +	struct mlx5_vdpa_net *ndev = dev_get_drvdata(&adev->dev);
>
> -	vdpa_unregister_device(&mvdev->vdev);
> +	vdpa_unregister_device(&ndev->mvdev.vdev);
>  }

IMHO, The more correct solution is to fix dev_set_drvdata() call,
because we are regustering/unregistering/allocating "struct mlx5_vdpa_dev".

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 88dde3455bfd..079b8fe669af 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1995,7 +1995,7 @@ static int mlx5v_probe(struct auxiliary_device *adev,
 	if (err)
 		goto err_reg;

-	dev_set_drvdata(&adev->dev, ndev);
+	dev_set_drvdata(&adev->dev, mvdev);
 	return 0;

 err_reg:

>
>  static const struct auxiliary_device_id mlx5v_id_table[] = {

> --
> 2.29.2
>