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

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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