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Date:   Fri, 25 Mar 2022 17:32:04 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Halil Pasic <pasic@linux.ibm.com>
Cc:     Robin Murphy <robin.murphy@arm.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Oleksandr Natalenko <oleksandr@natalenko.name>,
        Christoph Hellwig <hch@lst.de>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Toke =?iso-8859-1?Q?H=F8iland-J=F8rgensen?= <toke@toke.dk>,
        Kalle Valo <kvalo@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Olha Cherevyk <olha.cherevyk@gmail.com>,
        iommu <iommu@lists.linux-foundation.org>,
        linux-wireless <linux-wireless@vger.kernel.org>,
        Netdev <netdev@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable <stable@vger.kernel.org>
Subject: Re: [REGRESSION] Recent swiotlb DMA_FROM_DEVICE fixes break
 ath9k-based AP
Message-ID: <20220325163204.GB16426@lst.de>
References: <1812355.tdWV9SEqCh@natalenko.name> <CAHk-=wiwz+Z2MaP44h086jeniG-OpK3c=FywLsCwXV7Crvadrg@mail.gmail.com> <27b5a287-7a33-9a8b-ad6d-04746735fb0c@arm.com> <CAHk-=wip7TCD_+2STTepuEZvGMg6wcz+o=kyFUvHjuKziTMixw@mail.gmail.com> <f88ca616-96d1-82dc-1bc8-b17480e937dd@arm.com> <20220324190216.0efa067f.pasic@linux.ibm.com>
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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?