netdev - Re: [REGRESSION] Recent swiotlb DMA_FROM_DEVICE fixes break ath9k-based AP

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Message-ID: <CAHk-=wghZ3c4G2xjy3pR7txmdCnau21z_tidjfU2w0HO-90=sw@mail.gmail.com>
Date:   Fri, 25 Mar 2022 12:27:43 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:     Maxime Bizon <mbizon@...ebox.fr>,
        Toke Høiland-Jørgensen <toke@...e.dk>,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Olha Cherevyk <olha.cherevyk@...il.com>,
        iommu <iommu@...ts.linux-foundation.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable <stable@...r.kernel.org>
Subject: Re: [REGRESSION] Recent swiotlb DMA_FROM_DEVICE fixes break
 ath9k-based AP

On Fri, Mar 25, 2022 at 12:26 PM Oleksandr Natalenko
<oleksandr@...alenko.name> wrote:
>
> On pátek 25. března 2022 19:30:21 CET Linus Torvalds wrote:
> > The reason the ath9k issue was found quickly
> > is very likely *NOT* because ath9k is the only thing affected. No,
> > it's because ath9k is relatively common.
>
> Indeed. But having a wife who complains about non-working Wi-Fi printer definitely helps in finding the issue too.

Well, maybe we should credit her in the eventual resolution (whatever
it ends up being).

Although probably not using that exact wording.

        Linus