Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  lockdep, timer: Fix del_timer_sync() annotation
  RTC: Prevents a division by zero in kernel code.

3 files changed, 9 insertions, 1 deletions

diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 9583cbcc6b79..c404b61386bf 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -143,6 +143,7 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
         rtc->id = id;
         rtc->ops = ops;
         rtc->owner = owner;
+        rtc->irq_freq = 1;
         rtc->max_user_freq = 64;
         rtc->dev.parent = dev;
         rtc->dev.class = rtc_class;
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 925006d33109..a0c01967244d 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -464,6 +464,9 @@ int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, int freq)
         int err = 0;
         unsigned long flags;
 
+        if (freq <= 0)
+                return -EINVAL;
+
         spin_lock_irqsave(&rtc->irq_task_lock, flags);
         if (rtc->irq_task != NULL && task == NULL)
                 err = -EBUSY;
diff --git a/kernel/timer.c b/kernel/timer.c
index 43ca9936f2d0..d53ce66daea0 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -969,10 +969,14 @@ EXPORT_SYMBOL(try_to_del_timer_sync);
 int del_timer_sync(struct timer_list *timer)
 {
 #ifdef CONFIG_LOCKDEP
+        unsigned long flags;
+
+        raw_local_irq_save(flags);
         local_bh_disable();
         lock_map_acquire(&timer->lockdep_map);
         lock_map_release(&timer->lockdep_map);
-        local_bh_enable();
+        _local_bh_enable();
+        raw_local_irq_restore(flags);
 #endif
         /*
          * don't use it in hardirq context, because it