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

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Message-ID: <CAE-0n52QWn6hZp2ty5kjJ-rrQ+VvhQuR7exTW=0k4Yu8=RobAg@mail.gmail.com>
Date:   Tue, 12 Apr 2022 00:22:00 -0400
From:   Stephen Boyd <swboyd@...omium.org>
To:     Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>, agross@...nel.org,
        airlied@...ux.ie, bjorn.andersson@...aro.org, daniel@...ll.ch,
        robdclark@...il.com, sean@...rly.run, vkoul@...nel.org
Cc:     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] drm/msm/dp: stop event kernel thread when DP unbind

Quoting Abhinav Kumar (2022-04-11 17:29:17)
>
>
> On 4/11/2022 5:22 PM, Dmitry Baryshkov wrote:
> > On 12/04/2022 03:21, Stephen Boyd wrote:
> >> Quoting Kuogee Hsieh (2022-04-11 17:08:49)
> >>> -       kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
> >>> +       dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv,
> >>> "dp_hpd_handler");
> >>> +
> >>> +       if (IS_ERR(dp_priv->ev_tsk))
> >>> +               DRM_ERROR("failed to create DP event thread\n");
> >>
> >> Why can't we error out? Why can't this kthread be started in probe?
> >
> > Just my 2c. I don't think starting it in probe is a good idea. The
> > driver uses components, so, in my opinion, the thread should be started
> > from bind and stopped in unbind.
>
> Yes, I also agree it should be started in bind and stopped in unbind.
>

Sounds good to me! I forgot that this is a component.