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Message-ID: <trinity-345a7606-49c0-417a-b40a-5ff156332354-1626261811356@3c-app-gmx-bs01>
Date: Wed, 14 Jul 2021 13:23:31 +0200
From: Frank Wunderlich <frank-w@...lic-files.de>
To: Yong Wu <yong.wu@...iatek.com>
Cc: Matthias Brugger <matthias.bgg@...il.com>,
Joerg Roedel <joro@...tes.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
David Airlie <airlied@...ux.ie>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Evan Green <evgreen@...omium.org>,
Robin Murphy <robin.murphy@....com>,
Tomasz Figa <tfiga@...omium.org>,
Will Deacon <will.deacon@....com>,
linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
iommu@...ts.linux-foundation.org, youlin.pei@...iatek.com,
Nicolas Boichat <drinkcat@...omium.org>,
Matthias Kaehlcke <mka@...omium.org>, anan.sun@...iatek.com,
ming-fan.chen@...iatek.com, yi.kuo@...iatek.com,
acourbot@...omium.org, linux-media@...r.kernel.org,
dri-devel@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Xia Jiang <xia.jiang@...iatek.com>,
Tiffany Lin <tiffany.lin@...iatek.com>,
Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
Hsin-Yi Wang <hsinyi@...omium.org>,
Eizan Miyamoto <eizan@...omium.org>, anthony.huang@...iatek.com
Subject: Aw: Re: [PATCH v6 00/11] Clean up "mediatek,larb"
> Gesendet: Mittwoch, 14. Juli 2021 um 13:18 Uhr
> Von: "Yong Wu" <yong.wu@...iatek.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
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