PM / sleep: Print active wakeup sources when blocking on wakeup_count reads

If there are any wakeup events being processed, read operation
on /sys/power/wakeup_count will be blocked, so print the names
of all active wakeup sources to help to find out who is preventing
system suspend from triggering.

While at it change pr_info() in pm_print_active_wakeup_sources()
to pr_debug() to avoid excessive log noise.

Signed-off-by: xing wei <xing.wei@intel.com>
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 62e4de2aa8d1..bf9ba26981a5 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -811,7 +811,7 @@ void pm_print_active_wakeup_sources(void)
         rcu_read_lock();
         list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
                 if (ws->active) {
-                        pr_info("active wakeup source: %s\n", ws->name);
+                        pr_debug("active wakeup source: %s\n", ws->name);
                         active = 1;
                 } else if (!active &&
                            (!last_activity_ws ||
@@ -822,7 +822,7 @@ void pm_print_active_wakeup_sources(void)
         }
 
         if (!active && last_activity_ws)
-                pr_info("last active wakeup source: %s\n",
+                pr_debug("last active wakeup source: %s\n",
                         last_activity_ws->name);
         rcu_read_unlock();
 }
@@ -905,7 +905,7 @@ bool pm_get_wakeup_count(unsigned int *count, bool block)
                         split_counters(&cnt, &inpr);
                         if (inpr == 0 || signal_pending(current))
                                 break;
-
+                        pm_print_active_wakeup_sources();
                         schedule();
                 }
                 finish_wait(&wakeup_count_wait_queue, &wait);