clockevents: Add module refcount

We want to be able to remove clockevent modules as well. Add a
refcount so we don't remove a module with an active clock event
device.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Magnus Damm <magnus.damm@gmail.com>
Link: http://lkml.kernel.org/r/20130425143436.307435149@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/linux/clockchips.h

@@ -30,6 +30,7 @@ enum clock_event_nofitiers {
 #include <linux/notifier.h>
 
 struct clock_event_device;
+struct module;
 
 /* Clock event mode commands */
 enum clock_event_mode {
@@ -83,6 +84,7 @@ enum clock_event_mode {
  * @irq:		IRQ number (only for non CPU local devices)
  * @cpumask:		cpumask to indicate for which CPUs this device works
  * @list:		list head for the management code
+ * @owner:		module reference
  */
 struct clock_event_device {
 	void			(*event_handler)(struct clock_event_device *);
@@ -112,6 +114,7 @@ struct clock_event_device {
 	int			irq;
 	const struct cpumask	*cpumask;
 	struct list_head	list;
+	struct module		*owner;
 } ____cacheline_aligned;
 
 /*

kernel/time/clockevents.c

@@ -357,6 +357,7 @@ void clockevents_exchange_device(struct clock_event_device *old,
 	 * released list and do a notify add later.
 	 */
 	if (old) {
+		module_put(old->owner);
 		clockevents_set_mode(old, CLOCK_EVT_MODE_UNUSED);
 		list_del(&old->list);
 		list_add(&old->list, &clockevents_released);

kernel/time/tick-broadcast.c

@@ -19,6 +19,7 @@
 #include <linux/profile.h>
 #include <linux/sched.h>
 #include <linux/smp.h>
+#include <linux/module.h>
 
 #include "tick-internal.h"
 
@@ -73,6 +74,8 @@ void tick_install_broadcast_device(struct clock_event_device *dev)
 	     tick_broadcast_device.evtdev->rating >= dev->rating) ||
 	     (dev->features & CLOCK_EVT_FEAT_C3STOP))
 		return;
+	if (!try_module_get(dev->owner))
+		return;
 
 	clockevents_exchange_device(tick_broadcast_device.evtdev, dev);
 	if (cur)

kernel/time/tick-common.c

@@ -18,6 +18,7 @@
 #include <linux/percpu.h>
 #include <linux/profile.h>
 #include <linux/sched.h>
+#include <linux/module.h>
 
 #include <asm/irq_regs.h>
 
@@ -257,6 +258,9 @@ void tick_check_new_device(struct clock_event_device *newdev)
 			goto out_bc;
 	}
 
+	if (!try_module_get(newdev->owner))
+		return;
+
 	/*
 	 * Replace the eventually existing device by the new
 	 * device. If the current device is the broadcast device, do