drm/msm/dp: fix event thread stuck in wait_event after kthread_stop()

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().

Changes in v2:
--  correct spelling error at commit title

Changes in v3:
-- remove unnecessary parenthesis
-- while(1) to replace while (!kthread_should_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>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/484576/
Link: https://lore.kernel.org/r/1651595136-24312-1-git-send-email-quic_khsieh@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index c388323..da5c03a 100644 (file)
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1103,15 +1103,20 @@ static int hpd_event_thread(void *data)
 
        dp_priv = (struct dp_display_private *)data;
 
-       while (!kthread_should_stop()) {
+       while (1) {
                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) {