linux-kernel - Re: [PATCH] drm/msm/devfreq: Insert missing null check in msm_devfreq

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Date:   Wed, 17 Nov 2021 15:09:47 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Marijn Suijten <marijn.suijten@...ainline.org>,
        phone-devel@...r.kernel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Pavel Dubrova <pashadubrova@...il.com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, 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/devfreq: Insert missing null check in
 msm_devfreq_idle

Il 17/11/21 12:11, Marijn Suijten ha scritto:
> msm_devfreq_init only initializes the idle_work hrtimer when it succeeds
> to create a devfreq instance (devfreq support is optional), yet
> msm_devfreq_idle is called unconditionally from retire_submit and queues
> work on it.  We're seeing:
> 
>      [    2.005265] adreno 1c00000.gpu: [drm:msm_devfreq_init] *ERROR* Couldn't initialize GPU devfreq
> 
> Followed by a pagefault in:
> 
>      [   16.650316] pc : hrtimer_start_range_ns+0x64/0x360
>      [   16.650336] lr : msm_hrtimer_queue_work+0x18/0x2c
> 
> Moments later.  Just like msm_devfreq_active, check if the devfreq
> instance is not NULL before proceeding.
> 
> Fixes: 658f4c829688 ("drm/msm/devfreq: Add 1ms delay before clamping freq")
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>

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