From: Dmitry Shmidt <dimitrysh@google.com>
Date: Fri, 31 Oct 2014 23:05:46 +0000 (-0700)
Subject: power: Add check_wakeup_reason() to verify wakeup source irq
X-Git-Tag: firefly_0821_release~2958^2~176
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=dd0c7788b67fed52d2d2b9893f7290e3c63757b8;p=firefly-linux-kernel-4.4.55.git

power: Add check_wakeup_reason() to verify wakeup source irq

Wakeup reason is set before driver resume handlers are called.
It is cleared before driver suspend handlers are called, on
PM_SUSPEND_PREPARE.

Change-Id: I04218c9b0c115a7877e8029c73e6679ff82e0aa4
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
---

diff --git a/include/linux/wakeup_reason.h b/include/linux/wakeup_reason.h
index 5f095da2c977..ad8b76936c7f 100644
--- a/include/linux/wakeup_reason.h
+++ b/include/linux/wakeup_reason.h
@@ -22,4 +22,6 @@
 
 void log_wakeup_reason(int irq);
 void log_suspend_abort_reason(const char *fmt, ...);
+int check_wakeup_reason(int irq);
+
 #endif /* _LINUX_WAKEUP_REASON_H */
diff --git a/kernel/power/wakeup_reason.c b/kernel/power/wakeup_reason.c
index 2aacc34ef17c..085c99edca06 100644
--- a/kernel/power/wakeup_reason.c
+++ b/kernel/power/wakeup_reason.c
@@ -34,7 +34,7 @@ static int irqcount;
 static bool suspend_abort;
 static char abort_reason[MAX_SUSPEND_ABORT_LEN];
 static struct kobject *wakeup_reason;
-static spinlock_t resume_reason_lock;
+static DEFINE_SPINLOCK(resume_reason_lock);
 
 static ssize_t last_resume_reason_show(struct kobject *kobj, struct kobj_attribute *attr,
 		char *buf)
@@ -95,6 +95,21 @@ void log_wakeup_reason(int irq)
 	spin_unlock(&resume_reason_lock);
 }
 
+int check_wakeup_reason(int irq)
+{
+	int irq_no;
+	int ret = false;
+
+	spin_lock(&resume_reason_lock);
+	for (irq_no = 0; irq_no < irqcount; irq_no++)
+		if (irq_list[irq_no] == irq) {
+			ret = true;
+			break;
+	}
+	spin_unlock(&resume_reason_lock);
+	return ret;
+}
+
 void log_suspend_abort_reason(const char *fmt, ...)
 {
 	va_list args;
@@ -141,7 +156,7 @@ static struct notifier_block wakeup_reason_pm_notifier_block = {
 int __init wakeup_reason_init(void)
 {
 	int retval;
-	spin_lock_init(&resume_reason_lock);
+
 	retval = register_pm_notifier(&wakeup_reason_pm_notifier_block);
 	if (retval)
 		printk(KERN_WARNING "[%s] failed to register PM notifier %d\n",