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Commit 47b4a457 authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by John Stultz
Browse files

alarmtimer: Fix unavailable wake-up source in sysfs 



Currently the alarmtimer registers a wake-up source unconditionally,
regardless of the system having a (wake-up capable) RTC or not.
Hence the alarmtimer will always show up in
/sys/kernel/debug/wakeup_sources, even if it is not available, and thus
cannot be a wake-up source.

To fix this, postpone registration until a wake-up capable RTC device is
added.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Miroslav Lichvar <mlichvar@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
parent a529bea8

kernel/time/alarmtimer.c

+9 −2
Original line number Diff line number Diff line
@@ -56,9 +56,9 @@ static ktime_t freezer_delta; 
static DEFINE_SPINLOCK(freezer_delta_lock);

#endif



#ifdef CONFIG_RTC_CLASS

static struct wakeup_source *ws;



#ifdef CONFIG_RTC_CLASS

/* rtc timer and device for setting alarm wakeups at suspend */

static struct rtc_timer		rtctimer;

static struct rtc_device	*rtcdev;
@@ -89,6 +89,7 @@ static int alarmtimer_rtc_add_device(struct device *dev, 
{

	unsigned long flags;

	struct rtc_device *rtc = to_rtc_device(dev);

	struct wakeup_source *__ws;



	if (rtcdev)

		return -EBUSY;
@@ -98,13 +99,20 @@ static int alarmtimer_rtc_add_device(struct device *dev, 
	if (!device_may_wakeup(rtc->dev.parent))

		return -1;



	__ws = wakeup_source_register("alarmtimer");



	spin_lock_irqsave(&rtcdev_lock, flags);

	if (!rtcdev) {

		rtcdev = rtc;

		/* hold a reference so it doesn't go away */

		get_device(dev);

		ws = __ws;

		__ws = NULL;

	}

	spin_unlock_irqrestore(&rtcdev_lock, flags);



	wakeup_source_unregister(__ws);



	return 0;

}
@@ -860,7 +868,6 @@ static int __init alarmtimer_init(void) 
		error = PTR_ERR(pdev);

		goto out_drv;

	}

	ws = wakeup_source_register("alarmtimer");

	return 0;



out_drv: