Messages in this thread | | | Date | Mon, 2 May 2022 14:53:01 -0700 | Subject | Re: [PATCH] drm/msm/dp: fix event thread stuck in wait_event after kthread_sop() | From | Abhinav Kumar <> |
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On 5/2/2022 2:50 PM, Kuogee Hsieh wrote: > Event thread supposed to exit from its while loop after kthread_stop(). > However there may has possibility that event thread is pending in the > middle of wait_event due to condition checking never become true. > To make sure event thread exit its loop after kthread_stop(), this > patch OR kthread_should_stop() into wait_event's condition checking > so that event thread will exit its loop after kernal_stop(). > Reported-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > Fixes: 570d3e5d28db ("drm/msm/dp: stop event kernel thread when DP unbind") > Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> > --- > drivers/gpu/drm/msm/dp/dp_display.c | 11 ++++++++--- > 1 file changed, 8 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c > index c388323..5200a58 100644 > --- a/drivers/gpu/drm/msm/dp/dp_display.c > +++ b/drivers/gpu/drm/msm/dp/dp_display.c > @@ -1106,12 +1106,17 @@ static int hpd_event_thread(void *data) > while (!kthread_should_stop()) { > if (timeout_mode) { > wait_event_timeout(dp_priv->event_q, > - (dp_priv->event_pndx == dp_priv->event_gndx), > - EVENT_TIMEOUT); > + ((dp_priv->event_pndx == dp_priv->event_gndx) || > + kthread_should_stop()), EVENT_TIMEOUT); > } else { > wait_event_interruptible(dp_priv->event_q, > - (dp_priv->event_pndx != dp_priv->event_gndx)); > + ((dp_priv->event_pndx != dp_priv->event_gndx) || > + kthread_should_stop())); > } > + > + if(kthread_should_stop()) > + break; > + > spin_lock_irqsave(&dp_priv->event_lock, flag); > todo = &dp_priv->event_list[dp_priv->event_gndx]; > if (todo->delay) {
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