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

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Date:   Tue, 16 Feb 2021 08:42:26 +0200
From:   Eli Cohen <elic@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
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 08:35:51AM +0200, Leon Romanovsky wrote:
> 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".
> 

We're allocating "struct mlx5_vdpa_net". "struct mlx5_vdpa_dev" is just
a member field of "struct mlx5_vdpa_net".

> 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
> >