linux-kernel - Re: [PATCH V2] iommu: sprd: release dma buffer to avoid memory leak

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Date:   Thu, 9 Mar 2023 10:08:05 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     Chunyan Zhang <chunyan.zhang@...soc.com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     baolu.lu@...ux.intel.com, iommu@...ts.linux.dev,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] iommu: sprd: release dma buffer to avoid memory leak

On 3/8/23 11:41 AM, Chunyan Zhang wrote:
> Release page table DMA buffer when the IOMMU domain is not used:
> 
> - Domain freed.
> 
> - IOMMU is attaching to a new domain.
>    Since one sprd IOMMU servers only one client device, if the IOMMU has
>    been attached to other domain, it has to be detached first, that's
>    saying the DMA buffer should be released, otherwise that would
>    cause memory leak issue.
> 
> Signed-off-by: Chunyan Zhang<chunyan.zhang@...soc.com>

Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>

Best regards,
baolu