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path: root/drivers/base/power/wakeup.c
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Diffstat (limited to 'drivers/base/power/wakeup.c')
-rw-r--r--drivers/base/power/wakeup.c46
1 files changed, 40 insertions, 6 deletions
diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index cbb463b3a750..e6ee5e80e546 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -127,6 +127,8 @@ EXPORT_SYMBOL_GPL(wakeup_source_destroy);
*/
void wakeup_source_add(struct wakeup_source *ws)
{
+ unsigned long flags;
+
if (WARN_ON(!ws))
return;
@@ -135,9 +137,9 @@ void wakeup_source_add(struct wakeup_source *ws)
ws->active = false;
ws->last_time = ktime_get();
- spin_lock_irq(&events_lock);
+ spin_lock_irqsave(&events_lock, flags);
list_add_rcu(&ws->entry, &wakeup_sources);
- spin_unlock_irq(&events_lock);
+ spin_unlock_irqrestore(&events_lock, flags);
}
EXPORT_SYMBOL_GPL(wakeup_source_add);
@@ -147,12 +149,14 @@ EXPORT_SYMBOL_GPL(wakeup_source_add);
*/
void wakeup_source_remove(struct wakeup_source *ws)
{
+ unsigned long flags;
+
if (WARN_ON(!ws))
return;
- spin_lock_irq(&events_lock);
+ spin_lock_irqsave(&events_lock, flags);
list_del_rcu(&ws->entry);
- spin_unlock_irq(&events_lock);
+ spin_unlock_irqrestore(&events_lock, flags);
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(wakeup_source_remove);
@@ -649,6 +653,31 @@ 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 +700,10 @@ bool pm_wakeup_pending(void)
events_check_enabled = !ret;
}
spin_unlock_irqrestore(&events_lock, flags);
+
+ if (ret)
+ print_active_wakeup_sources();
+
return ret;
}
@@ -723,15 +756,16 @@ bool pm_get_wakeup_count(unsigned int *count, bool block)
bool pm_save_wakeup_count(unsigned int count)
{
unsigned int cnt, inpr;
+ unsigned long flags;
events_check_enabled = false;
- spin_lock_irq(&events_lock);
+ spin_lock_irqsave(&events_lock, flags);
split_counters(&cnt, &inpr);
if (cnt == count && inpr == 0) {
saved_count = count;
events_check_enabled = true;
}
- spin_unlock_irq(&events_lock);
+ spin_unlock_irqrestore(&events_lock, flags);
return events_check_enabled;
}