From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ciao.gmane.io (ciao.gmane.io [116.202.254.214]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DF4F135AC2D for ; Mon, 23 Mar 2026 22:32:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=116.202.254.214 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774305140; cv=none; b=kfep49ba9XQ0A1tJgAIbzM1dcWiX+qrT1bzvLMhO+t8o8Ol4osPW0dN0RAU0N/ZTG+dKA0pm+aau8PdEHkLyimDgtb7klqzg8XsTUoFtQh2AbyopWMB3FCjWSrLj5CrOFXwLvASI8PLad+mUu1aNp3SWFso0MqjZL9EI+DX2Yzo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774305140; c=relaxed/simple; bh=W2MikfPMLo8P0OJj5ewC+LotKWTg8jOhnz+x5hUrhVo=; h=To:From:Subject:Date:Message-ID:References:Mime-Version: Content-Type:Cc; b=MgprZiWcttWEYBnO8ZFtwUWCJF3yGhEvtDJT4xcQeMtZ153IRtzkvph2p73L2sFaQzhxXjC923IYejj3Z4QerJbCneOkx64c8poeHGieQm9ys9ZRSpARz4/mbpRy9cupo6M53d50YUJfjoQBBGNHFDhKoXBfCDUeajWGfzQrEDk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=elrepo.org; spf=pass smtp.mailfrom=m.gmane-mx.org; arc=none smtp.client-ip=116.202.254.214 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=elrepo.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=m.gmane-mx.org Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1w4njq-0005d1-JH for stable@vger.kernel.org; Mon, 23 Mar 2026 23:27:10 +0100 X-Injected-Via-Gmane: http://gmane.org/ To: stable@vger.kernel.org From: Akemi Yagi Subject: Re: [REGRESSION] PCI: Revert "Enable ACS after configuring IOMMU for OF platforms" Date: Mon, 23 Mar 2026 22:27:05 -0000 (UTC) Message-ID: <10psenp$dtr$1@ciao.gmane.io> References: <20260320172335.29778-1-john@kernel.doghat.io> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit User-Agent: Pan/0.149 (Bellevue; 4c157ba git@gitlab.gnome.org:GNOME/pan.git) Cc: linux-pci@vger.kernel.org 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