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-rw-r--r--kernel/time/tick-oneshot.c36
1 files changed, 30 insertions, 6 deletions
diff --git a/kernel/time/tick-oneshot.c b/kernel/time/tick-oneshot.c
index 06595c64b0c9..2e35501e61dd 100644
--- a/kernel/time/tick-oneshot.c
+++ b/kernel/time/tick-oneshot.c
@@ -25,18 +25,42 @@
/**
* tick_program_event internal worker function
*/
-static int __tick_program_event(struct clock_event_device *dev,
- ktime_t expires, int force)
+int tick_dev_program_event(struct clock_event_device *dev, ktime_t expires,
+ int force)
{
ktime_t now = ktime_get();
+ int i;
- while (1) {
+ for (i = 0;;) {
int ret = clockevents_program_event(dev, expires, now);
if (!ret || !force)
return ret;
+
+ /*
+ * We tried 2 times to program the device with the given
+ * min_delta_ns. If that's not working then we double it
+ * and emit a warning.
+ */
+ if (++i > 2) {
+ printk(KERN_WARNING "CE: __tick_program_event of %s is "
+ "stuck %llx %llx\n", dev->name ? dev->name : "?",
+ now.tv64, expires.tv64);
+ printk(KERN_WARNING
+ "CE: increasing min_delta_ns %ld to %ld nsec\n",
+ dev->min_delta_ns, dev->min_delta_ns << 1);
+ WARN_ON(1);
+
+ /* Double the min. delta and try again */
+ if (!dev->min_delta_ns)
+ dev->min_delta_ns = 5000;
+ else
+ dev->min_delta_ns <<= 1;
+ i = 0;
+ }
+
now = ktime_get();
- expires = ktime_add(now, ktime_set(0, dev->min_delta_ns));
+ expires = ktime_add_ns(now, dev->min_delta_ns);
}
}
@@ -47,7 +71,7 @@ int tick_program_event(ktime_t expires, int force)
{
struct clock_event_device *dev = __get_cpu_var(tick_cpu_device).evtdev;
- return __tick_program_event(dev, expires, force);
+ return tick_dev_program_event(dev, expires, force);
}
/**
@@ -71,7 +95,7 @@ void tick_setup_oneshot(struct clock_event_device *newdev,
{
newdev->event_handler = handler;
clockevents_set_mode(newdev, CLOCK_EVT_MODE_ONESHOT);
- __tick_program_event(newdev, next_event, 1);
+ tick_dev_program_event(newdev, next_event, 1);
}
/**