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Date: Sun, 27 Mar 2022 17:37:24 -0700 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Halil Pasic <pasic@...ux.ibm.com> Cc: Toke Høiland-Jørgensen <toke@...e.dk>, Robin Murphy <robin.murphy@....com>, Christoph Hellwig <hch@....de>, Maxime Bizon <mbizon@...ebox.fr>, 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 Sun, Mar 27, 2022 at 4:37 PM Halil Pasic <pasic@...ux.ibm.com> wrote: > > > For the record, I believe that the partial revert proposed here > https://www.spinics.net/lists/linux-wireless/msg222300.html > 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 complexity. So that part of commit aa6f8dcbab47 was probably all good. I somehow missed that Oleksandr had a tested-by for that smaller change too. Linus
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