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Commit 05148cd5 authored by Dmitry Shmidt's avatar Dmitry Shmidt Committed by Amit Pundir
Browse files

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: default avatarDmitry Shmidt <dimitrysh@google.com>
parent c425eda2

include/linux/wakeup_reason.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */

kernel/power/wakeup_reason.c

+17 −2
Original line number Diff line number Diff line
@@ -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",