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

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Message-ID: <ab02e1298955d6f535928e2c34079973e656e3b8.camel@sipsolutions.net>
Date:   Mon, 28 Mar 2022 11:57:30 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Halil Pasic <pasic@...ux.ibm.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Maxime Bizon <mbizon@...ebox.fr>,
        Toke Høiland-Jørgensen <toke@...e.dk>,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        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 Mon, 2022-03-28 at 11:50 +0200, Johannes Berg wrote:
> No I worded that badly - the direction isn't useless, but thinking of it
> in terms of a buffer property rather than data movement is inaccurate.
> So then if we need something else to indicate how data was expected to
> be moved, the direction argument becomes useless, since it's not a
> buffer property but rather a temporal thing on a specific place that
> expected certain data movement.
> 

Yeah, umm. I should've read the whole thread of the weekend first, sorry
for the noise.

johannes