linux-kernel - Re: [PATCH v2] iommu/mediatek: Fix crash on isr after kexec()

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Message-ID: <c2c32931-1fec-fcd1-8120-2d66b55d3f1f@collabora.com>
Date:   Tue, 29 Nov 2022 16:08:59 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Ricardo Ribalda <ribalda@...omium.org>,
        Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Yong Wu <yong.wu@...iatek.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iommu/mediatek: Fix crash on isr after kexec()

Il 28/11/22 23:16, Ricardo Ribalda ha scritto:
> If the system is rebooted via isr(), the IRQ handler might be triggerd
> before the domain is initialized. Resulting on an invalid memory access
> error.
> 
> Fix:
> [    0.500930] Unable to handle kernel read from unreadable memory at virtual address 0000000000000070
> [    0.501166] Call trace:
> [    0.501174]  report_iommu_fault+0x28/0xfc
> [    0.501180]  mtk_iommu_isr+0x10c/0x1c0
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> Reviewed-by: Robin Murphy <robin.murphy@....com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>