linux-kernel - [ 018/180] 2.6.32.x: timekeeping: Add missing update call in timekeeping

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Message-Id: <20121001225158.378973359@1wt.eu>
Date:	Tue, 02 Oct 2012 00:52:15 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	John Stultz <johnstul@...ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Prarit Bhargava <prarit@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Willy Tarreau <w@....eu>
Subject: [ 018/180] 2.6.32.x: timekeeping: Add missing update call in timekeeping_resume()

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Gleixner <tglx@...utronix.de>

This is a backport of 3e997130bd2e8c6f5aaa49d6e3161d4d29b43ab0

The leap second rework unearthed another issue of inconsistent data.

On timekeeping_resume() the timekeeper data is updated, but nothing
calls timekeeping_update(), so now the update code in the timer
interrupt sees stale values.

This has been the case before those changes, but then the timer
interrupt was using stale data as well so this went unnoticed for quite
some time.

Add the missing update call, so all the data is consistent everywhere.

Reported-by: Andreas Schwab <schwab@...ux-m68k.org>
Reported-and-tested-by: "Rafael J. Wysocki" <rjw@...k.pl>
Reported-and-tested-by: Martin Steigerwald <Martin@...htvoll.de>
Cc: LKML <linux-kernel@...r.kernel.org>
Cc: Linux PM list <linux-pm@...r.kernel.org>
Cc: John Stultz <johnstul@...ibm.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: stable@...r.kernel.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: John Stultz <johnstul@...ibm.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Linux Kernel <linux-kernel@...r.kernel.org>
Signed-off-by: John Stultz <johnstul@...ibm.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 kernel/time/timekeeping.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 6054b94..3f7e53f 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -637,6 +637,7 @@ static int timekeeping_resume(struct sys_device *dev)
 	timekeeper.clock->cycle_last = timekeeper.clock->read(timekeeper.clock);
 	timekeeper.ntp_error = 0;
 	timekeeping_suspended = 0;
+	timekeeping_update(false);
 	write_sequnlock_irqrestore(&xtime_lock, flags);
 
 	touch_softlockup_watchdog();
-- 
1.7.2.1.45.g54fbc



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