diff options
Diffstat (limited to 'kernel/time/tick-oneshot.c')
| -rw-r--r-- | kernel/time/tick-oneshot.c | 36 |
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); } /** |