diff options
Diffstat (limited to 'kernel/time/clockevents.c')
| -rw-r--r-- | kernel/time/clockevents.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c index 822beebe664a..3e59fce6dd43 100644 --- a/kernel/time/clockevents.c +++ b/kernel/time/clockevents.c @@ -41,6 +41,11 @@ unsigned long clockevent_delta2ns(unsigned long latch, { u64 clc = ((u64) latch << evt->shift); + if (unlikely(!evt->mult)) { + evt->mult = 1; + WARN_ON(1); + } + do_div(clc, evt->mult); if (clc < 1000) clc = 1000; @@ -78,6 +83,11 @@ int clockevents_program_event(struct clock_event_device *dev, ktime_t expires, unsigned long long clc; int64_t delta; + if (unlikely(expires.tv64 < 0)) { + WARN_ON_ONCE(1); + return -ETIME; + } + delta = ktime_to_ns(ktime_sub(expires, now)); if (delta <= 0) @@ -146,6 +156,14 @@ static void clockevents_notify_released(void) void clockevents_register_device(struct clock_event_device *dev) { BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED); + /* + * A nsec2cyc multiplicator of 0 is invalid and we'd crash + * on it, so fix it up and emit a warning: + */ + if (unlikely(!dev->mult)) { + dev->mult = 1; + WARN_ON(1); + } spin_lock(&clockevents_lock); |