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Date:   Sun, 27 Mar 2022 17:37:24 -0700
From:   Linus Torvalds <>
To:     Halil Pasic <>
Cc:     Toke Høiland-Jørgensen <>,
        Robin Murphy <>,
        Christoph Hellwig <>,
        Maxime Bizon <>,
        Oleksandr Natalenko <>,
        Marek Szyprowski <>,
        Kalle Valo <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        Paolo Abeni <>,
        Olha Cherevyk <>,
        iommu <>,
        linux-wireless <>,
        Netdev <>,
        Linux Kernel Mailing List <>,
        Greg Kroah-Hartman <>,
        stable <>
Subject: Re: [REGRESSION] Recent swiotlb DMA_FROM_DEVICE fixes break
 ath9k-based AP

On Sun, Mar 27, 2022 at 4:37 PM Halil Pasic <> wrote:
> For the record, I believe that the partial revert proposed here
> would have been a wiser choice, than a complete revert of commit
> aa6f8dcbab47 ("swiotlb: rework "fix info leak with DMA_FROM_DEVICE"").

Yeah, the revert is basically my standard "this doesn't work,
discussion is still ongoing" thing.

I agree that the revert then brought back that DMA_ATTR_SKIP_CPU_SYNC

So that part of commit aa6f8dcbab47 was probably all good.

I somehow missed that Oleksandr had a tested-by for that smaller change too.


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