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

From	Joerg Roedel <joro@8bytes.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 0/8] iommu: Make core iommu-groups code more generic
Date	2015-11-19 14:50 +0100
Message-ID	<qwxL4-1xA-15@gated-at.bofh.it> (permalink)
References	<qm9Am-7mh-3@gated-at.bofh.it> <qwxL4-1xA-17@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

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@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

Re: [PATCH 0/8] iommu: Make core iommu-groups code more generic Joerg Roedel <joro@8bytes.org> - 2015-11-19 14:50 +0100

csiph-web