Merge branch 'timers/urgent' into timers/core

[firefly-linux-kernel-4.4.55.git] / kernel / time / tick-broadcast.c

diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 827e0f862da49276be703b3008cd3821c602def4..c7218d13273861dd65f5a484852001f88d8ce819 100644 (file)
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -524,10 +524,11 @@ static void tick_broadcast_init_next_event(struct cpumask *mask,
  */
 void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
 {
+       int cpu = smp_processor_id();
+
        /* Set it up only once ! */
        if (bc->event_handler != tick_handle_oneshot_broadcast) {
                int was_periodic = bc->mode == CLOCK_EVT_MODE_PERIODIC;
-               int cpu = smp_processor_id();
 
                bc->event_handler = tick_handle_oneshot_broadcast;
                clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
@@ -553,6 +554,15 @@ void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
                        tick_broadcast_set_event(tick_next_period, 1);
                } else
                        bc->next_event.tv64 = KTIME_MAX;
+       } else {
+               /*
+                * The first cpu which switches to oneshot mode sets
+                * the bit for all other cpus which are in the general
+                * (periodic) broadcast mask. So the bit is set and
+                * would prevent the first broadcast enter after this
+                * to program the bc device.
+                */
+               tick_broadcast_clear_oneshot(cpu);
        }
 }