From: Akemi Yagi <toracat@elrepo.org>
To: stable@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Subject: Re: [REGRESSION] PCI: Revert "Enable ACS after configuring IOMMU for OF platforms"
Date: Mon, 23 Mar 2026 22:27:05 -0000 (UTC) [thread overview]
Message-ID: <10psenp$dtr$1@ciao.gmane.io> (raw)
In-Reply-To: ovfco6pqzw734flu7navat36avt6yfosruouduhmbti7umunus@ijmu6nhz56l5
On Mon, 23 Mar 2026 20:43:55 +0530, Manivannan Sadhasivam wrote:
>> Dropping this from 6.12.y and earlier stable branches seems like the
>> correct action to me (but not a mainline revert, obviously). ACS had
>> essentially *never* worked properly on OF platforms prior to 6.15, but
>> that was more down to fundamental design flaws in the OF-based IOMMU
>> probe path (dating back to 4.12) rather than any easily-fixable bug as
>> such, so realistically I think we just leave it that way.
>>
> That's my opinion as well. I guess I need to send reverts for rest of
> the older stable kernels as well.
This is a short note to say that the 6.1 kernel was affected and the
issue was fixed by reverting the referenced commit ( https://elrepo.org/
bugs/view.php?id=1587 ).
Relevant bugzilla entry is here:
https://bugzilla.kernel.org/show_bug.cgi?id=221234
Akemi
next prev parent reply other threads:[~2026-03-23 22:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-20 17:23 [REGRESSION] PCI: Revert "Enable ACS after configuring IOMMU for OF platforms" John Hancock
2026-03-23 12:31 ` bjorn.forsman
2026-03-23 13:54 ` Manivannan Sadhasivam
2026-03-23 15:06 ` Robin Murphy
2026-03-23 15:13 ` Manivannan Sadhasivam
2026-03-23 22:27 ` Akemi Yagi [this message]
2026-03-23 15:09 ` Manivannan Sadhasivam
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