1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index cbb463b3a750..8a0a9ca6ad65 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -649,6 +649,31 @@ void pm_wakeup_event(struct device *dev, unsigned int msec)
 }
 EXPORT_SYMBOL_GPL(pm_wakeup_event);
 
+static void print_active_wakeup_sources(void)
+{
+        struct wakeup_source *ws;
+        int active = 0;
+        struct wakeup_source *last_activity_ws = NULL;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
+                if (ws->active) {
+                        pr_info("active wakeup source: %s\n", ws->name);
+                        active = 1;
+                } else if (!active &&
+                           (!last_activity_ws ||
+                            ktime_to_ns(ws->last_time) >
+                            ktime_to_ns(last_activity_ws->last_time))) {
+                        last_activity_ws = ws;
+                }
+        }
+
+        if (!active && last_activity_ws)
+                pr_info("last active wakeup source: %s\n",
+                        last_activity_ws->name);
+        rcu_read_unlock();
+}
+
 /**
  * pm_wakeup_pending - Check if power transition in progress should be aborted.
  *
@@ -671,6 +696,10 @@ bool pm_wakeup_pending(void)
                 events_check_enabled = !ret;
         }
         spin_unlock_irqrestore(&events_lock, flags);
+
+        if (ret)
+                print_active_wakeup_sources();
+
         return ret;
 }