Re: [PATCH v6 06/33] of/device: Move dma_range_map before of_iommu_configure

[Rob Herring]

On Mon, Jan 11, 2021 at 07:18:47PM +0800, Yong Wu wrote:
> "dev->dma_range_map" contains the devices' dma_ranges information,
> This patch moves dma_range_map before of_iommu_configure. The iommu
> driver may need to know the dma_address requirements of its iommu
> consumer devices.
> 
> CC: Rob Herring <robh+dt@xxxxxxxxxx>
> CC: Frank Rowand <frowand.list@xxxxxxxxx>
> Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx>
> ---
>  drivers/of/device.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/of/device.c b/drivers/of/device.c
> index aedfaaafd3e7..1d84636149df 100644
> --- a/drivers/of/device.c
> +++ b/drivers/of/device.c
> @@ -170,9 +170,11 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
>  	dev_dbg(dev, "device is%sdma coherent\n",
>  		coherent ? " " : " not ");
>  
> +	dev->dma_range_map = map;
>  	iommu = of_iommu_configure(dev, np, id);
>  	if (PTR_ERR(iommu) == -EPROBE_DEFER) {
>  		kfree(map);
> +		dev->dma_range_map = NULL;

Not really going to matter, but you should probably clear dma_range_map 
before what it points to is freed.

With that,

Reviewed-by: Rob Herring <robh@xxxxxxxxxx>

>  		return -EPROBE_DEFER;
>  	}
>  
> @@ -181,7 +183,6 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
>  
>  	arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);
>  
> -	dev->dma_range_map = map;
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(of_dma_configure_id);
> -- 
> 2.18.0
>