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Date: Fri, 25 Mar 2022 19:15:32 +0100 From: Toke Høiland-Jørgensen <toke@...e.dk> To: Christoph Hellwig <hch@....de>, Halil Pasic <pasic@...ux.ibm.com> Cc: Robin Murphy <robin.murphy@....com>, Linus Torvalds <torvalds@...ux-foundation.org>, Oleksandr Natalenko <oleksandr@...alenko.name>, Christoph Hellwig <hch@....de>, 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 Christoph Hellwig <hch@....de> writes: > On Thu, Mar 24, 2022 at 07:02:16PM +0100, Halil Pasic wrote: >> > If >> > ddbd89deb7d3 alone turns out to work OK then I'd be inclined to try a >> > partial revert of just that one hunk. >> > >> >> I'm not against being pragmatic and doing the partial revert. But as >> explained above, I do believe for correctness of swiotlb we ultimately >> do need that change. So if the revert is the short term solution, >> what should be our mid-term road-map? > > Unless I'm misunderstanding this thread we found the bug in ath9k > and have a fix for that now? According to Maxim's comment on the other subthread, that ath9k patch wouldn't work on all platforms (and constitutes a bit of a violation of the DMA API ownership abstraction). So not quite, I think? -Toke
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