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authorThomas Gleixner <tglx@linutronix.de>2013-04-25 20:31:50 +0000
committerThomas Gleixner <tglx@linutronix.de>2013-05-16 11:09:17 +0200
commit45cb8e01b2ecef1c2afb18333e95793fa1a90281 (patch)
tree9528babbf50046bffca4270952af0b5a38f56895 /kernel/time/tick-broadcast.c
parent501f867064e95f9a6f540e60705be0937280e7ec (diff)
downloadop-kernel-dev-45cb8e01b2ecef1c2afb18333e95793fa1a90281.zip
op-kernel-dev-45cb8e01b2ecef1c2afb18333e95793fa1a90281.tar.gz
clockevents: Split out selection logic
Split out the clockevent device selection logic. Preparatory patch to allow unbinding active clockevent devices. 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/20130425143436.431796247@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/time/tick-broadcast.c')
-rw-r--r--kernel/time/tick-broadcast.c25
1 files changed, 20 insertions, 5 deletions
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 0e374cd..d067c01 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -65,19 +65,34 @@ static void tick_broadcast_start_periodic(struct clock_event_device *bc)
/*
* Check, if the device can be utilized as broadcast device:
*/
+static bool tick_check_broadcast_device(struct clock_event_device *curdev,
+ struct clock_event_device *newdev)
+{
+ if ((newdev->features & CLOCK_EVT_FEAT_DUMMY) ||
+ (newdev->features & CLOCK_EVT_FEAT_C3STOP))
+ return false;
+
+ if (tick_broadcast_device.mode == TICKDEV_MODE_ONESHOT &&
+ !(newdev->features & CLOCK_EVT_FEAT_ONESHOT))
+ return false;
+
+ return !curdev || newdev->rating > curdev->rating;
+}
+
+/*
+ * Conditionally install/replace broadcast device
+ */
void tick_install_broadcast_device(struct clock_event_device *dev)
{
struct clock_event_device *cur = tick_broadcast_device.evtdev;
- if ((dev->features & CLOCK_EVT_FEAT_DUMMY) ||
- (tick_broadcast_device.evtdev &&
- tick_broadcast_device.evtdev->rating >= dev->rating) ||
- (dev->features & CLOCK_EVT_FEAT_C3STOP))
+ if (!tick_check_broadcast_device(cur, dev))
return;
+
if (!try_module_get(dev->owner))
return;
- clockevents_exchange_device(tick_broadcast_device.evtdev, dev);
+ clockevents_exchange_device(cur, dev);
if (cur)
cur->event_handler = clockevents_handle_noop;
tick_broadcast_device.evtdev = dev;
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