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[PATCH] x86: fix potential jiffies overflow in timer_resume() 

i386 timer_resume is updating jiffies, not jiffies_64.  It looks there is a
potential overflow problem.  And jiffies_64 and wall_jiffies should be
protected by xtime_lock.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Atsushi Nemoto 2006-03-06 15:42:42 -08:00 committed by Linus Torvalds
parent b05121b29e
commit f7c09bd972
1 changed files with 2 additions and 2 deletions
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4
arch/i386/kernel/time.c
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@ -412,9 +412,9 @@ static int timer_resume(struct sys_device *dev)
write_seqlock_irqsave(&xtime_lock, flags); write_seqlock_irqsave(&xtime_lock, flags);
xtime.tv_sec = sec; xtime.tv_sec = sec;
xtime.tv_nsec = 0; xtime.tv_nsec = 0;
write_sequnlock_irqrestore(&xtime_lock, flags); jiffies_64 += sleep_length;
jiffies += sleep_length;
wall_jiffies += sleep_length; wall_jiffies += sleep_length;
write_sequnlock_irqrestore(&xtime_lock, flags);
if (last_timer->resume) if (last_timer->resume)
last_timer->resume(); last_timer->resume();
cur_timer = last_timer; cur_timer = last_timer;