linux-kernel - Re: [PATCH v6 06/33] of/device: Move dma_range_map before of_iommu

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Date:   Thu, 14 Jan 2021 13:27:32 -0600
From:   Rob Herring <robh@...nel.org>
To:     Yong Wu <yong.wu@...iatek.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, youlin.pei@...iatek.com,
        Nicolas Boichat <drinkcat@...omium.org>, anan.sun@...iatek.com,
        chao.hao@...iatek.com, Frank Rowand <frowand.list@...il.com>
Subject: Re: [PATCH v6 06/33] of/device: Move dma_range_map before
 of_iommu_configure

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@...nel.org>
> CC: Frank Rowand <frowand.list@...il.com>
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
>  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@...nel.org>

>  		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
>