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Subject: Re: Regression in at least 5.10.y and mainline: Firewire audio
 interface fails to work properly (when booted under Xen)
To:     Salvatore Bonaccorso <carnil@debian.org>,
        =?UTF-8?B?5bCP5aSq?= <nospam@kota.moe>,
        Jianxiong Gao <jxgao@google.com>,
        Christoph Hellwig <hch@lst.de>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        xen-devel@lists.xenproject.org
Cc:     989778-maintonly@bugs.debian.org
References: <162352833546.2353.230557992597997974.reportbug@home.kota.moe>
 <YMWl4UnFBAVRDnys@eldamar.lan>
From:   Robin Murphy <robin.murphy@arm.com>
Message-ID: <2f7c7d36-b6f4-f8ab-756e-a563fa03b9e4@arm.com>
Date:   Mon, 14 Jun 2021 14:29:08 +0100
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On 2021-06-13 07:29, Salvatore Bonaccorso wrote:
> A user in Debian reported the above issue, which was reproducible with
> 5.13-rc5 and 5.10.y as packaged in Debian and found that 85a5a6875ca9
> ("swiotlb: don't modify orig_addr in swiotlb_tbl_sync_single") that
> introduced the issue.

Sounds like it's probably the same thing as being discussed over here:

https://lore.kernel.org/linux-iommu/2e899de2-4b69-c4b6-33a6-09fb8949d2fd@nxp.com/

Robin.