linux-kernel - [tip:timers/urgent] ntp: Fix STA

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Message-ID: <tip-6b1859dba01c7d512b72d77e3fd7da8354235189@git.kernel.org>
Date:	Sun, 15 Jul 2012 00:57:29 -0700
From:	tip-bot for John Stultz <johnstul@...ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	a.p.zijlstra@...llo.nl, johnstul@...ibm.com,
	richardcochran@...il.com, tglx@...utronix.de, prarit@...hat.com
Subject: [tip:timers/urgent] ntp: Fix STA_INS/DEL clearing bug

Commit-ID:  6b1859dba01c7d512b72d77e3fd7da8354235189
Gitweb:     http://git.kernel.org/tip/6b1859dba01c7d512b72d77e3fd7da8354235189
Author:     John Stultz <johnstul@...ibm.com>
AuthorDate: Fri, 13 Jul 2012 01:21:50 -0400
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sun, 15 Jul 2012 09:48:49 +0200

ntp: Fix STA_INS/DEL clearing bug

In commit 6b43ae8a619d17c4935c3320d2ef9e92bdeed05d, I
introduced a bug that kept the STA_INS or STA_DEL bit
from being cleared from time_status via adjtimex()
without forcing STA_PLL first.

Usually once the STA_INS is set, it isn't cleared
until the leap second is applied, so its unlikely this
affected anyone. However during testing I noticed it
took some effort to cancel a leap second once STA_INS
was set.

Signed-off-by: John Stultz <johnstul@...ibm.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Richard Cochran <richardcochran@...il.com>
Cc: Prarit Bhargava <prarit@...hat.com>
CC: stable@...r.kernel.org # 3.4
Link: http://lkml.kernel.org/r/1342156917-25092-2-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/ntp.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 70b33ab..b7fbadc 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -409,7 +409,9 @@ int second_overflow(unsigned long secs)
 			time_state = TIME_DEL;
 		break;
 	case TIME_INS:
-		if (secs % 86400 == 0) {
+		if (!(time_status & STA_INS))
+			time_state = TIME_OK;
+		else if (secs % 86400 == 0) {
 			leap = -1;
 			time_state = TIME_OOP;
 			time_tai++;
@@ -418,7 +420,9 @@ int second_overflow(unsigned long secs)
 		}
 		break;
 	case TIME_DEL:
-		if ((secs + 1) % 86400 == 0) {
+		if (!(time_status & STA_DEL))
+			time_state = TIME_OK;
+		else if ((secs + 1) % 86400 == 0) {
 			leap = 1;
 			time_tai--;
 			time_state = TIME_WAIT;
--
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