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clockevents: warn once when program_event() is called with negative expiry

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The hrtimer problem with large relative timeouts resulting in a
negative expiry time went unnoticed as there is no check in the
clockevents_program_event() code. Put a check there with a WARN_ONCE
to avoid such problems in the future.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2007-12-07 19:16:17 +01:00 • committed by Ingo Molnar
parent 62f0f61e66
commit 167b1de3ee
1 changed files with 5 additions and 0 deletions
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5
kernel/time/clockevents.c
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@ -78,6 +78,11 @@ int clockevents_program_event(struct clock_event_device *dev, ktime_t expires,
unsigned long long clc; unsigned long long clc;
int64_t delta; int64_t delta;
if (unlikely(expires.tv64 < 0)) {
WARN_ON_ONCE(1);
return -ETIME;
}
delta = ktime_to_ns(ktime_sub(expires, now)); delta = ktime_to_ns(ktime_sub(expires, now));
if (delta <= 0) if (delta <= 0)