linux-kernel - Re: [PATCH] drm/msm/kms: move snapshot init earlier in KMS init

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Message-ID: <ad1afd1b-9cad-47d1-8dc9-0d62b25f502a@oss.qualcomm.com>
Date: Wed, 16 Jul 2025 11:58:25 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov
 <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/kms: move snapshot init earlier in KMS init

On 7/15/25 5:50 PM, Dmitry Baryshkov wrote:
> Various parts of the display driver can be triggering the display
> snapshot (including the IOMMU fault handlers). Move the call to
> msm_disp_snapshot_init() before KMS initialization, otherwise it is
> possible to ocassionally trigger the kernel fault during init:

[...]

> Reported-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> Fixes: 98659487b845 ("drm/msm: add support to take dpu snapshot")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad