clockevents: Simplify locking

Now that the notifier chain is gone there are no other users and it's
pointless to nest tick_device_lock inside of clockevents_lock because
there is no other use case.

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/20130425143436.162888472@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 5 insertions, 17 deletions

diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index dbf4e18d5101..170a4bdfa99e 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -33,7 +33,6 @@ DEFINE_PER_CPU(struct tick_device, tick_cpu_device);
 ktime_t tick_next_period;
 ktime_t tick_period;
 int tick_do_timer_cpu __read_mostly = TICK_DO_TIMER_BOOT;
-static DEFINE_RAW_SPINLOCK(tick_device_lock);
 
 /*
  * Debugging: see timer_list.c
@@ -206,16 +205,14 @@ static void tick_setup_device(struct tick_device *td,
 }
 
 /*
- * Check, if the new registered device should be used.
+ * Check, if the new registered device should be used. Called with
+ * clockevents_lock held and interrupts disabled.
  */
 void tick_check_new_device(struct clock_event_device *newdev)
 {
         struct clock_event_device *curdev;
         struct tick_device *td;
         int cpu;
-        unsigned long flags;
-
-        raw_spin_lock_irqsave(&tick_device_lock, flags);
 
         cpu = smp_processor_id();
         if (!cpumask_test_cpu(cpu, newdev->cpumask))
@@ -273,8 +270,6 @@ void tick_check_new_device(struct clock_event_device *newdev)
         tick_setup_device(td, newdev, cpu, cpumask_of(cpu));
         if (newdev->features & CLOCK_EVT_FEAT_ONESHOT)
                 tick_oneshot_notify();
-
-        raw_spin_unlock_irqrestore(&tick_device_lock, flags);
         return;
 
 out_bc:
@@ -282,7 +277,6 @@ out_bc:
          * Can the new device be used as a broadcast device ?
          */
         tick_install_broadcast_device(newdev);
-        raw_spin_unlock_irqrestore(&tick_device_lock, flags);
 }
 
 /*
@@ -311,9 +305,7 @@ static void tick_shutdown(unsigned int *cpup)
 {
         struct tick_device *td = &per_cpu(tick_cpu_device, *cpup);
         struct clock_event_device *dev = td->evtdev;
-        unsigned long flags;
 
-        raw_spin_lock_irqsave(&tick_device_lock, flags);
         td->mode = TICKDEV_MODE_PERIODIC;
         if (dev) {
                 /*
@@ -325,26 +317,20 @@ static void tick_shutdown(unsigned int *cpup)
                 dev->event_handler = clockevents_handle_noop;
                 td->evtdev = NULL;
         }
-        raw_spin_unlock_irqrestore(&tick_device_lock, flags);
 }
 
 static void tick_suspend(void)
 {
         struct tick_device *td = &__get_cpu_var(tick_cpu_device);
-        unsigned long flags;
 
-        raw_spin_lock_irqsave(&tick_device_lock, flags);
         clockevents_shutdown(td->evtdev);
-        raw_spin_unlock_irqrestore(&tick_device_lock, flags);
 }
 
 static void tick_resume(void)
 {
         struct tick_device *td = &__get_cpu_var(tick_cpu_device);
-        unsigned long flags;
         int broadcast = tick_resume_broadcast();
 
-        raw_spin_lock_irqsave(&tick_device_lock, flags);
         clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_RESUME);
 
         if (!broadcast) {
@@ -353,9 +339,11 @@ static void tick_resume(void)
                 else
                         tick_resume_oneshot();
         }
-        raw_spin_unlock_irqrestore(&tick_device_lock, flags);
 }
 
+/*
+ * Called with clockevents_lock held and interrupts disabled
+ */
 void tick_notify(unsigned long reason, void *dev)
 {
         switch (reason) {