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authorJohn Stultz <john.stultz@linaro.org>2011-08-10 12:30:21 -0700
committerJohn Stultz <john.stultz@linaro.org>2011-08-10 14:55:27 -0700
commita28cde81ab13cc251748a4c4ef06883dd09a10ea (patch)
treeb38ce180912957731cfe736d1d3f978342d099e1 /kernel/time/alarmtimer.c
parent9e26476243e438f4534a562660c1296a15a9e202 (diff)
alarmtimers: Add more refined alarm state tracking
In order to allow for functionality like try_to_cancel, add more refined state tracking (similar to hrtimers). CC: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'kernel/time/alarmtimer.c')
-rw-r--r--kernel/time/alarmtimer.c21
1 files changed, 14 insertions, 7 deletions
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 90935591dd44..5b14cc29b6a6 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -126,6 +126,8 @@ static struct rtc_device *alarmtimer_get_rtcdev(void)
static void alarmtimer_enqueue(struct alarm_base *base, struct alarm *alarm)
{
timerqueue_add(&base->timerqueue, &alarm->node);
+ alarm->state |= ALARMTIMER_STATE_ENQUEUED;
+
if (&alarm->node == timerqueue_getnext(&base->timerqueue)) {
hrtimer_try_to_cancel(&base->timer);
hrtimer_start(&base->timer, alarm->node.expires,
@@ -147,7 +149,12 @@ static void alarmtimer_remove(struct alarm_base *base, struct alarm *alarm)
{
struct timerqueue_node *next = timerqueue_getnext(&base->timerqueue);
+ if (!(alarm->state & ALARMTIMER_STATE_ENQUEUED))
+ return;
+
timerqueue_del(&base->timerqueue, &alarm->node);
+ alarm->state &= ~ALARMTIMER_STATE_ENQUEUED;
+
if (next == &alarm->node) {
hrtimer_try_to_cancel(&base->timer);
next = timerqueue_getnext(&base->timerqueue);
@@ -188,16 +195,18 @@ static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer)
alarm = container_of(next, struct alarm, node);
timerqueue_del(&base->timerqueue, &alarm->node);
- alarm->enabled = 0;
+ alarm->state &= ~ALARMTIMER_STATE_ENQUEUED;
+ alarm->state |= ALARMTIMER_STATE_CALLBACK;
spin_unlock_irqrestore(&base->lock, flags);
if (alarm->function)
restart = alarm->function(alarm, now);
spin_lock_irqsave(&base->lock, flags);
+ alarm->state &= ~ALARMTIMER_STATE_CALLBACK;
if (restart != ALARMTIMER_NORESTART) {
timerqueue_add(&base->timerqueue, &alarm->node);
- alarm->enabled = 1;
+ alarm->state |= ALARMTIMER_STATE_ENQUEUED;
}
}
@@ -305,7 +314,7 @@ void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
timerqueue_init(&alarm->node);
alarm->function = function;
alarm->type = type;
- alarm->enabled = 0;
+ alarm->state = ALARMTIMER_STATE_INACTIVE;
}
/**
@@ -319,11 +328,10 @@ void alarm_start(struct alarm *alarm, ktime_t start)
unsigned long flags;
spin_lock_irqsave(&base->lock, flags);
- if (alarm->enabled)
+ if (alarmtimer_active(alarm))
alarmtimer_remove(base, alarm);
alarm->node.expires = start;
alarmtimer_enqueue(base, alarm);
- alarm->enabled = 1;
spin_unlock_irqrestore(&base->lock, flags);
}
@@ -337,9 +345,8 @@ void alarm_cancel(struct alarm *alarm)
unsigned long flags;
spin_lock_irqsave(&base->lock, flags);
- if (alarm->enabled)
+ if (alarmtimer_is_queued(alarm))
alarmtimer_remove(base, alarm);
- alarm->enabled = 0;
spin_unlock_irqrestore(&base->lock, flags);
}