Messages in this thread | | | Date | Thu, 19 Nov 2015 14:41:14 +0100 | From | Joerg Roedel <> | 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
| |