linux-kernel - Re: [PATCH v1 1/1] iommu/virtio: Do not dereference fwnode in struct device

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Date:   Tue, 9 Aug 2022 08:20:48 +0100
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Joerg Roedel <jroedel@...e.de>,
        virtualization@...ts.linux-foundation.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v1 1/1] iommu/virtio: Do not dereference fwnode in struct
 device

On Mon, Aug 01, 2022 at 07:51:42PM +0300, Andy Shevchenko wrote:
> In order to make the underneath API easier to change in the future,
> prevent users from dereferencing fwnode from struct device.
> Instead, use the specific device_match_fwnode() API for that.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Reviewed-by: Jean-Philippe Brucker <jean-philippe@...aro.org>

> ---
>  drivers/iommu/virtio-iommu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
> index 08eeafc9529f..9fe723f55213 100644
> --- a/drivers/iommu/virtio-iommu.c
> +++ b/drivers/iommu/virtio-iommu.c
> @@ -925,7 +925,7 @@ static struct virtio_driver virtio_iommu_drv;
>  
>  static int viommu_match_node(struct device *dev, const void *data)
>  {
> -	return dev->parent->fwnode == data;
> +	return device_match_fwnode(dev->parent, data);
>  }
>  
>  static struct viommu_dev *viommu_get_by_fwnode(struct fwnode_handle *fwnode)
> -- 
> 2.35.1
>