linux-kernel - Re: [PATCH 0/8] iommu: Make core iommu-groups code more generic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20151119134114.GC2064@8bytes.org>
Date:	Thu, 19 Nov 2015 14:41:14 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Yong Wu <yong.wu@...iatek.com>
Cc:	iommu@...ts.linux-foundation.org,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, yingjoe.chen@...iatek.com
Subject: Re: [PATCH 0/8] iommu: Make core iommu-groups code more generic

Hi Yong Wu,

On Thu, Nov 19, 2015 at 04:13:21PM +0800, Yong Wu wrote:
> (151119_13:39:37.472)WARNING:
> at /proj/mtk40525/upstreamdev/v4.4/kernel/mediatek/drivers/iommu/iommu.c:1154
> (151119_13:39:37.472)Modules linked in:
> (151119_13:39:37.472)CPU: 1 PID: 731 Comm: sh Not tainted 4.4.0-rc1+
> #37
> (151119_13:39:37.472)Hardware name: MediaTek MT8173 evaluation board
> (DT)
> (151119_13:39:37.472)task: ffffffc076bb4d00 ti: ffffffc076bdc000
> task.ti: ffffffc076bdc000
> (151119_13:39:37.472)PC is at iommu_detach_device+0x5c/0xb0
> (151119_13:39:37.472)LR is at iommu_detach_device+0x30/0xb0
> xxx

This warning triggers when you use iommu_detach_device() with a device
that is in a group with other devices. For those devices you must
attach/detach the whole group of devices.

For that you have to use iommu_detach_group() and iommu_attach_group().


	Joerg

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/