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authorThomas Gleixner <tglx@linutronix.de>2008-09-16 11:32:50 -0700
committerThomas Gleixner <tglx@linutronix.de>2008-09-16 13:47:02 -0700
commit2344abbcbdb82140050e8be29d3d55e4f6fe860b (patch)
tree46c1842fc2a47aa4d7ee0c2c558f54bc50772b69 /kernel/time/tick-broadcast.c
parentf1926ce63b996b42772b39e4b47bb4ef4ba748b4 (diff)
clockevents: make device shutdown robust
The device shut down does not cleanup the next_event variable of the clock event device. So when the device is reactivated the possible stale next_event value can prevent the device to be reprogrammed as it claims to wait on a event already. This is the root cause of the resurfacing suspend/resume problem, where systems need key press to come back to life. Fix this by setting next_event to KTIME_MAX when the device is shut down. Use a separate function for shutdown which takes care of that and only keep the direct set mode call in the broadcast code, where we can not touch the next_event value. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/time/tick-broadcast.c')
-rw-r--r--kernel/time/tick-broadcast.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 2f5a38294bf..f1f3eee2811 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -236,8 +236,7 @@ static void tick_do_broadcast_on_off(void *why)
if (!cpu_isset(cpu, tick_broadcast_mask)) {
cpu_set(cpu, tick_broadcast_mask);
if (td->mode == TICKDEV_MODE_PERIODIC)
- clockevents_set_mode(dev,
- CLOCK_EVT_MODE_SHUTDOWN);
+ clockevents_shutdown(dev);
}
if (*reason == CLOCK_EVT_NOTIFY_BROADCAST_FORCE)
tick_broadcast_force = 1;
@@ -254,7 +253,7 @@ static void tick_do_broadcast_on_off(void *why)
if (cpus_empty(tick_broadcast_mask)) {
if (!bc_stopped)
- clockevents_set_mode(bc, CLOCK_EVT_MODE_SHUTDOWN);
+ clockevents_shutdown(bc);
} else if (bc_stopped) {
if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC)
tick_broadcast_start_periodic(bc);
@@ -306,7 +305,7 @@ void tick_shutdown_broadcast(unsigned int *cpup)
if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC) {
if (bc && cpus_empty(tick_broadcast_mask))
- clockevents_set_mode(bc, CLOCK_EVT_MODE_SHUTDOWN);
+ clockevents_shutdown(bc);
}
spin_unlock_irqrestore(&tick_broadcast_lock, flags);
@@ -321,7 +320,7 @@ void tick_suspend_broadcast(void)
bc = tick_broadcast_device.evtdev;
if (bc)
- clockevents_set_mode(bc, CLOCK_EVT_MODE_SHUTDOWN);
+ clockevents_shutdown(bc);
spin_unlock_irqrestore(&tick_broadcast_lock, flags);
}