Aw: Re: [PATCH v6 00/11] Clean up "mediatek,larb"

Frank Wunderlich
2021-07-14T11:25:51Z

> Gesendet: Mittwoch, 14. Juli 2021 um 13:18 Uhr
> Von: "Yong Wu" <yong.wu@mediatek.com>
> Hi Frank,
>
> Thanks for your report. mt7623 use mtk_iommu_v1.c.
>
> I will try to reproduce this locally.

Hi,

as far as i have debugged it dev->iommu_group is NULL, so it crashes on first access (dev_info)

drivers/iommu/iommu.c:

923 void iommu_group_remove_device(struct device *dev)
924 {
925 printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);
926 struct iommu_group *group = dev->iommu_group;
927 struct group_device *tmp_device, *device = NULL;
928
929 printk(KERN_ALERT "DEBUG: Passed %s %d 0x%08x\n",__FUNCTION__,__LINE__,(unsigned int)group);
930 dev_info(dev, "Removing from iommu group %d\n", group->id);

regards Frank