linux-kernel - Re: [PATCH v2] drm/msm/dp: add fail safe mode outside of event

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Date:   Tue, 12 Apr 2022 00:24:19 -0400
From:   Stephen Boyd <swboyd@...omium.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>, agross@...nel.org,
        airlied@...ux.ie, bjorn.andersson@...aro.org, daniel@...ll.ch,
        dmitry.baryshkov@...aro.org, robdclark@...il.com, sean@...rly.run,
        vkoul@...nel.org
Cc:     quic_abhinavk@...cinc.com, quic_aravindh@...cinc.com,
        quic_sbillaka@...cinc.com, freedreno@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/msm/dp: add fail safe mode outside of event_mutex context

Quoting Kuogee Hsieh (2022-04-08 14:04:54)
> There is possible circular locking dependency detected on event_mutex
> (see below logs). This is due to set fail safe mode is done at
> dp_panel_read_sink_caps() within event_mutex scope. To break this
> possible circular locking, this patch move setting fail safe mode
> out of event_mutex scope.
>

Reviewed-by: Stephen Boyd <swboyd@...omium.org>