[linux-pm] [PATCH 04/13] PM: wakelock: Override wakelocks when using /sys/power/state

[Arve Hjønnevåg]

This preserves existing functionality when CONFIG_WAKELOCK is set.

Signed-off-by: Arve Hjønnevåg <arve at android.com>
---
 kernel/power/main.c     |    7 +++++++
 kernel/power/power.h    |    1 +
 kernel/power/wakelock.c |    4 ++++
 3 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/kernel/power/main.c b/kernel/power/main.c
index 2399888..ab9fc7f 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -515,6 +515,10 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 	p = memchr(buf, '\n', n);
 	len = p ? p - buf : n;
 
+#ifdef CONFIG_WAKELOCK
+	ignore_suspend_wakelocks = 1;
+#endif
+
 	/* First, check if we are requested to hibernate */
 	if (len == 4 && !strncmp(buf, "disk", len)) {
 		error = hibernate();
@@ -531,6 +535,9 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 #endif
 
  Exit:
+#ifdef CONFIG_WAKELOCK
+	ignore_suspend_wakelocks = 0;
+#endif
 	return error ? error : n;
 }
 
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 1527174..ed1b7f4 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -229,4 +229,5 @@ static inline void suspend_thaw_processes(void)
 extern struct workqueue_struct *suspend_work_queue;
 extern struct wake_lock main_wake_lock;
 extern suspend_state_t requested_suspend_state;
+extern bool ignore_suspend_wakelocks;
 #endif
diff --git a/kernel/power/wakelock.c b/kernel/power/wakelock.c
index c9e22f9..8a8608e 100644
--- a/kernel/power/wakelock.c
+++ b/kernel/power/wakelock.c
@@ -47,6 +47,7 @@ static int current_event_num;
 struct workqueue_struct *suspend_work_queue;
 struct wake_lock main_wake_lock;
 suspend_state_t requested_suspend_state = PM_SUSPEND_MEM;
+bool ignore_suspend_wakelocks;
 static struct wake_lock unknown_wakeup;
 
 #ifdef CONFIG_WAKELOCK_STAT
@@ -260,6 +261,9 @@ long has_wake_lock(int type)
 {
 	long ret;
 	unsigned long irqflags;
+	if (WARN_ONCE(type == WAKE_LOCK_SUSPEND && ignore_suspend_wakelocks,
+							"ignoring wakelocks\n"))
+		return 0;
 	spin_lock_irqsave(&list_lock, irqflags);
 	ret = has_wake_lock_locked(type);
 	spin_unlock_irqrestore(&list_lock, irqflags);
-- 
1.6.1