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Date:   Wed, 23 Dec 2020 08:51:53 +0000
From:   Christoph Hellwig <>
To:     Yong Wu <>
Cc:     Joerg Roedel <>, Will Deacon <>,
        Robin Murphy <>,,, Nicolas Boichat <>,,,,
        Krzysztof Kozlowski <>,
        Tomasz Figa <>,,,
        Matthias Brugger <>,
        Greg Kroah-Hartman <>,,
Subject: Re: [PATCH v3 1/7] iommu: Move iotlb_sync_map out from __iommu_map

On Wed, Dec 16, 2020 at 06:36:01PM +0800, Yong Wu wrote:
> In the end of __iommu_map, It alway call iotlb_sync_map.
> This patch moves iotlb_sync_map out from __iommu_map since it is
> unnecessary to call this for each sg segment especially iotlb_sync_map
> is flush tlb all currently.
> Signed-off-by: Yong Wu <>
> Reviewed-by: Robin Murphy <>

What about adding a little helper that does the NULL check and method
call instead of duplicating it all over?

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