1 files changed, 9 insertions, 27 deletions

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index e1040b80362c..4534e7871c8c 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -963,33 +963,16 @@ u64 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
 }
 EXPORT_SYMBOL_GPL(hrtimer_forward);
 
-#ifdef CONFIG_PREEMPT_RT_BASE
-# define wake_up_timer_waiters(b)	wake_up(&(b)->wait)
-
-/**
- * hrtimer_wait_for_timer - Wait for a running timer
- *
- * @timer:	timer to wait for
- *
- * The function waits in case the timers callback function is
- * currently executed on the waitqueue of the timer base. The
- * waitqueue is woken up after the timer callback function has
- * finished execution.
- */
-void hrtimer_wait_for_timer(const struct hrtimer *timer)
+void hrtimer_grab_expiry_lock(const struct hrtimer *timer)
 {
 	struct hrtimer_clock_base *base = timer->base;
 
-	if (base && base->cpu_base &&
-	    base->index >= HRTIMER_BASE_MONOTONIC_SOFT)
-		wait_event(base->cpu_base->wait,
-				!(hrtimer_callback_running(timer)));
+	if (base && base->cpu_base) {
+		spin_lock(&base->cpu_base->softirq_expiry_lock);
+		spin_unlock(&base->cpu_base->softirq_expiry_lock);
+	}
 }
 
-#else
-# define wake_up_timer_waiters(b)	do { } while (0)
-#endif
-
 /*
  * enqueue_hrtimer - internal function to (re)start a timer
  *
@@ -1224,7 +1207,7 @@ int hrtimer_cancel(struct hrtimer *timer)
 
 		if (ret >= 0)
 			return ret;
-		hrtimer_wait_for_timer(timer);
+		hrtimer_grab_expiry_lock(timer);
 	}
 }
 EXPORT_SYMBOL_GPL(hrtimer_cancel);
@@ -1528,6 +1511,7 @@ static __latent_entropy void hrtimer_run_softirq(struct softirq_action *h)
 	unsigned long flags;
 	ktime_t now;
 
+	spin_lock(&cpu_base->softirq_expiry_lock);
 	raw_spin_lock_irqsave(&cpu_base->lock, flags);
 
 	now = hrtimer_update_base(cpu_base);
@@ -1537,7 +1521,7 @@ static __latent_entropy void hrtimer_run_softirq(struct softirq_action *h)
 	hrtimer_update_softirq_timer(cpu_base, true);
 
 	raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
-	wake_up_timer_waiters(cpu_base);
+	spin_unlock(&cpu_base->softirq_expiry_lock);
 }
 
 #ifdef CONFIG_HIGH_RES_TIMERS
@@ -1947,9 +1931,7 @@ int hrtimers_prepare_cpu(unsigned int cpu)
 	cpu_base->softirq_next_timer = NULL;
 	cpu_base->expires_next = KTIME_MAX;
 	cpu_base->softirq_expires_next = KTIME_MAX;
-#ifdef CONFIG_PREEMPT_RT_BASE
-	init_waitqueue_head(&cpu_base->wait);
-#endif
+	spin_lock_init(&cpu_base->softirq_expiry_lock);
 	return 0;
 }