linux-kernel - Re: [PATCH v2] of/device: Update dma_range_map only when dev has valid dma-ranges

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Date:   Wed, 27 Jan 2021 14:00:46 -0600
From:   Rob Herring <robh@...nel.org>
To:     Yong Wu <yong.wu@...iatek.com>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Tomasz Figa <tfiga@...gle.com>,
        Robin Murphy <robin.murphy@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Will Deacon <will@...nel.org>, srv_heupstream@...iatek.com,
        Nicolas Boichat <drinkcat@...omium.org>,
        Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH v2] of/device: Update dma_range_map only when dev has
 valid dma-ranges

On Tue, 19 Jan 2021 18:52:03 +0800, Yong Wu wrote:
> The commit e0d072782c73 ("dma-mapping: introduce DMA range map,
> supplanting dma_pfn_offset") always update dma_range_map even though it was
> already set, like in the sunxi_mbus driver. the issue is reported at [1].
> This patch avoid this(Updating it only when dev has valid dma-ranges).
> 
> Meanwhile, 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.
> 
> [1] https://lore.kernel.org/linux-arm-kernel/5c7946f3-b56e-da00-a750-be097c7ceb32@arm.com/
> 
> CC: Rob Herring <robh+dt@...nel.org>
> CC: Frank Rowand <frowand.list@...il.com>
> Fixes: e0d072782c73 ("dma-mapping: introduce DMA range map, supplanting dma_pfn_offset"),
> Suggested-by: Robin Murphy <robin.murphy@....com>
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
>  drivers/of/device.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 

Applied, thanks!