diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2007-03-06 08:25:42 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-06 09:30:24 -0800 |
| commit | 6321dd60c76b2e12383bc06046288b15397ed3a0 (patch) | |
| tree | 4cea63e69ce4f6f5f7f94fc6905063efdde7974e /kernel/time/tick-common.c | |
| parent | c3442e296517aee733d62fc3fe03211598902c7d (diff) | |
[PATCH] Save/restore periodic tick information over suspend/resume
The programming of periodic tick devices needs to be saved/restored
across suspend/resume - otherwise we might end up with a system coming
up that relies on getting a PIT (or HPET) interrupt, while those devices
default to 'no interrupts' after powerup. (To confuse things it worked
to a certain degree on some systems because the lapic gets initialized
as a side-effect of SMP bootup.)
This suspend / resume thing was dropped unintentionally during the
last-minute -mm code reshuffling.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/time/tick-common.c')
| -rw-r--r-- | kernel/time/tick-common.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c index 0986a2bfab49..43ba1bdec14c 100644 --- a/kernel/time/tick-common.c +++ b/kernel/time/tick-common.c @@ -298,6 +298,28 @@ static void tick_shutdown(unsigned int *cpup) spin_unlock_irqrestore(&tick_device_lock, flags); } +static void tick_suspend_periodic(void) +{ + struct tick_device *td = &__get_cpu_var(tick_cpu_device); + unsigned long flags; + + spin_lock_irqsave(&tick_device_lock, flags); + if (td->mode == TICKDEV_MODE_PERIODIC) + clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_SHUTDOWN); + spin_unlock_irqrestore(&tick_device_lock, flags); +} + +static void tick_resume_periodic(void) +{ + struct tick_device *td = &__get_cpu_var(tick_cpu_device); + unsigned long flags; + + spin_lock_irqsave(&tick_device_lock, flags); + if (td->mode == TICKDEV_MODE_PERIODIC) + tick_setup_periodic(td->evtdev, 0); + spin_unlock_irqrestore(&tick_device_lock, flags); +} + /* * Notification about clock event devices */ @@ -325,6 +347,16 @@ static int tick_notify(struct notifier_block *nb, unsigned long reason, tick_shutdown(dev); break; + case CLOCK_EVT_NOTIFY_SUSPEND: + tick_suspend_periodic(); + tick_suspend_broadcast(); + break; + + case CLOCK_EVT_NOTIFY_RESUME: + if (!tick_resume_broadcast()) + tick_resume_periodic(); + break; + default: break; } |