From: xing wei <xing.wei@intel.com>
Date: Wed, 7 Dec 2016 11:31:16 +0000 (+0800)
Subject: PM / sleep: Print active wakeup sources when blocking on wakeup_count reads
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9320f95c0b8f1d074f570385e6855d4554f693e4;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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>
---

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);