From 8143f11197a205bde6129176ff5055b7af07621c Mon Sep 17 00:00:00 2001
From: Ruchi Kandoi <kandoiruchi@google.com>
Date: Wed, 8 Apr 2015 15:42:29 -0700
Subject: [PATCH] wakeup: Add last wake up source logging for suspend abort
reason.
There is a possibility that a wakeup source event is received after
the device prepares to suspend which might cause the suspend to abort.
This patch adds the functionality of reporting the last active wakeup
source which is currently not active but caused the suspend to abort reason
via the /sys/kernel/power/last_wakeup_reason file.
Change-Id: I1760d462f497b33e425f5565cb6cff5973932ec3
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
---
drivers/base/power/wakeup.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)
diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index bea700736f24..4b35cc08c3b6 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -14,6 +14,7 @@
#include <linux/suspend.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
+#include <linux/types.h>
#include <trace/events/power.h>
#include "power.h"
@@ -661,16 +662,31 @@ EXPORT_SYMBOL_GPL(pm_wakeup_event);
void pm_get_active_wakeup_sources(char *pending_wakeup_source, size_t max)
{
- struct wakeup_source *ws;
+ struct wakeup_source *ws, *last_active_ws = NULL;
int len = 0;
+ bool active = false;
+
rcu_read_lock();
- len += snprintf(pending_wakeup_source, max, "Pending Wakeup Sources: ");
list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
if (ws->active) {
- len += snprintf(pending_wakeup_source + len, max,
+ if (!active)
+ len += scnprintf(pending_wakeup_source, max,
+ "Pending Wakeup Sources: ");
+ len += scnprintf(pending_wakeup_source + len, max - len,
"%s ", ws->name);
+ active = true;
+ } else if (!active &&
+ (!last_active_ws ||
+ ktime_to_ns(ws->last_time) >
+ ktime_to_ns(last_active_ws->last_time))) {
+ last_active_ws = ws;
}
}
+ if (!active && last_active_ws) {
+ scnprintf(pending_wakeup_source, max,
+ "Last active Wakeup Source: %s",
+ last_active_ws->name);
+ }
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(pm_get_active_wakeup_sources);
--
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