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Diffstat (limited to 'kernel/time/alarmtimer.c')
-rw-r--r--kernel/time/alarmtimer.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 0b8ff7d257ea..ec09ce9a6012 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -28,6 +28,7 @@
#include <linux/workqueue.h>
#include <linux/freezer.h>
#include <linux/compat.h>
+#include <linux/module.h>
#include "posix-timers.h"
@@ -56,9 +57,9 @@ 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 +90,7 @@ 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 +100,25 @@ 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) {
+ if (!try_module_get(rtc->owner)) {
+ spin_unlock_irqrestore(&rtcdev_lock, flags);
+ return -1;
+ }
+
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 +874,6 @@ static int __init alarmtimer_init(void)
error = PTR_ERR(pdev);
goto out_drv;
}
- ws = wakeup_source_register("alarmtimer");
return 0;
out_drv: