linux-kernel - Re: [PATCH v6] drm/msm/dp: stop event kernel thread when DP unbind

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Date:   Fri, 15 Apr 2022 12:43:08 -0700
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 v6] drm/msm/dp: stop event kernel thread when DP unbind

Quoting Kuogee Hsieh (2022-04-15 08:41:16)
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 01453db..92c9819 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -230,6 +231,14 @@ void dp_display_signal_audio_complete(struct msm_dp *dp_display)
>         complete_all(&dp->audio_comp);
>  }
>
> +static void dp_hpd_event_thread_stop(struct dp_display_private *dp_priv)
> +{
> +       kthread_stop(dp_priv->ev_tsk);
> +
> +}
> +
> +static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
> +
>  static int dp_display_bind(struct device *dev, struct device *master,
>                            void *data)
>  {
> @@ -280,6 +290,9 @@ static void dp_display_unbind(struct device *dev, struct device *master,
>         struct drm_device *drm = dev_get_drvdata(master);
>         struct msm_drm_private *priv = drm->dev_private;
>
> +       /* disable all HPD interrupts */
> +       dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
> +       dp_hpd_event_thread_stop(dp);

It's a one line function. How about just

	kthread_stop(dp->ev_tsk)

>         dp_power_client_deinit(dp->power);
>         dp_aux_unregister(dp->aux);
>         priv->dp[dp->id] = NULL;