[RFC][PATCH] i386: incorrect xtime locking on resume

[john stultz <johnstul@us.ibm.com>]

All,
	Nigel was asking about some suspend2 patches, and while looking at them
I noticed what looks to be a bug where jiffies and wall_jiffies are
modified without holding the xtime_lock in the resume path.

This patch should fix it, but I wanted to get some review and testing
done before I submit it.

thanks
-john


Signed-off-by: John Stultz <johnstul@us.ibm.com>

diff --git a/arch/i386/kernel/time.c b/arch/i386/kernel/time.c
index a14d594..406c8d8 100644
--- a/arch/i386/kernel/time.c
+++ b/arch/i386/kernel/time.c
@@ -412,9 +412,9 @@ static int timer_resume(struct sys_devic
 	write_seqlock_irqsave(&xtime_lock, flags);
 	xtime.tv_sec = sec;
 	xtime.tv_nsec = 0;
-	write_sequnlock_irqrestore(&xtime_lock, flags);
 	jiffies += sleep_length;
 	wall_jiffies += sleep_length;
+	write_sequnlock_irqrestore(&xtime_lock, flags);
 	if (last_timer->resume)
 		last_timer->resume();
 	cur_timer = last_timer;


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