Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer fixes from Thomas Gleixner:
 "A rather small update for the time(r) subsystem:

   - A new clocksource driver IMX-TPM

   - Minor fixes to the alarmtimer facility

   - Device tree cleanups for Renesas drivers

   - A new kselftest and fixes for the timer related tests

   - Conversion of the clocksource drivers to use %pOF

   - Use the proper helpers to access rlimits in the posix-cpu-timer
     code"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  alarmtimer: Ensure RTC module is not unloaded
  clocksource: Convert to using %pOF instead of full_name
  clocksource/drivers/bcm2835: Remove message for a memory allocation failure
  devicetree: bindings: Remove deprecated properties
  devicetree: bindings: Remove unused 32-bit CMT bindings
  devicetree: bindings: Deprecate property, update example
  devicetree: bindings: r8a73a4 and R-Car Gen2 CMT bindings
  devicetree: bindings: R-Car Gen2 CMT0 and CMT1 bindings
  devicetree: bindings: Remove sh7372 CMT binding
  clocksource/drivers/imx-tpm: Add imx tpm timer support
  dt-bindings: timer: Add nxp tpm timer binding doc
  posix-cpu-timers: Use dedicated helper to access rlimit values
  alarmtimer: Fix unavailable wake-up source in sysfs
  timekeeping: Use proper timekeeper for debug code
  kselftests: timers: set-timer-lat: Add one-shot timer test cases
  kselftests: timers: set-timer-lat: Tweak reporting when timer fires early
  kselftests: timers: freq-step: Fix build warning
  kselftests: timers: freq-step: Define ADJ_SETOFFSET if device has older kernel headers

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: