linux-kernel - Re: [PATCH] iommu/dma: add missing support for DMA_ATTR_MMIO for dma_iova

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Message-ID: <20251124181752.GX233636@ziepe.ca>
Date: Mon, 24 Nov 2025 14:17:52 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, Leon Romanovsky <leon@...nel.org>
Subject: Re: [PATCH] iommu/dma: add missing support for DMA_ATTR_MMIO for
 dma_iova_unlink()

On Mon, Nov 24, 2025 at 06:09:55PM +0100, Marek Szyprowski wrote:
> Commit c288d657dd51 added support for DMA_ATTR_MMIO attribute in the
> dma_iova_link() code path, but missed that the CPU cache is being also
> touched in the dma_iova_unlink() path. Fix this.
> 
> Fixes: c288d657dd51 ("iommu/dma: implement DMA_ATTR_MMIO for dma_iova_link().")
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>  drivers/iommu/dma-iommu.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Did you find it by code inspection?

Jason