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Fix RTC updates from ntp (rhbz 985522)

This commit is contained in:
Josh Boyer 2013-09-20 11:18:49 -04:00
parent f2c5f4cfa6
commit 12089cc748
2 changed files with 53 additions and 0 deletions
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9
kernel.spec
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@ -759,6 +759,9 @@ Patch25104: ansi_cprng-Fix-off-by-one-error-in-non-block-size-request.patch
Patch25103: fix-arm-btrfs-build.patch
#rhbz 985522
Patch25107: ntp-Make-periodic-RTC-update-more-reliable.patch
# END OF PATCH DEFINITIONS
%endif
@ -1478,6 +1481,9 @@ ApplyPatch fix-arm-btrfs-build.patch
#CVE-2013-4345 rhbz 1007690 1009136
ApplyPatch ansi_cprng-Fix-off-by-one-error-in-non-block-size-request.patch
#rhbz 985522
ApplyPatch ntp-Make-periodic-RTC-update-more-reliable.patch
# END OF PATCH APPLICATIONS
%endif
@ -2282,6 +2288,9 @@ fi
# ||----w |
# || ||
%changelog
* Fri Sep 20 2013 Josh Boyer <jwboyer@fedoraproject.org>
- Fix RTC updates from ntp (rhbz 985522)
* Fri Sep 20 2013 Josh Boyer <jwboyer@fedoraproject.org> - 3.12.0-0.rc1.git4.1
- Linux v3.12-rc1-250-g7b9e3a6

44
ntp-Make-periodic-RTC-update-more-reliable.patch Normal file
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@ -0,0 +1,44 @@
From a97ad0c4b447a132a322cedc3a5f7fa4cab4b304 Mon Sep 17 00:00:00 2001
From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Thu, 1 Aug 2013 19:31:35 +0200
Subject: [PATCH] ntp: Make periodic RTC update more reliable
The current code requires that the scheduled update of the RTC happens
in the closest tick to the half of the second. This seems to be
difficult to achieve reliably. The scheduled work may be missing the
target time by a tick or two and be constantly rescheduled every second.
Relax the limit to 10 ticks. As a typical RTC drifts in the 11-minute
update interval by several milliseconds, this shouldn't affect the
overall accuracy of the RTC much.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
kernel/time/ntp.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 8f5b3b9..ab1fa7c 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -475,6 +475,7 @@ static void sync_cmos_clock(struct work_struct *work)
* called as close as possible to 500 ms before the new second starts.
* This code is run on a timer. If the clock is set, that timer
* may not expire at the correct time. Thus, we adjust...
+ * We want the clock to be within a couple of ticks from the target.
*/
if (!ntp_synced()) {
/*
@@ -485,7 +486,7 @@ static void sync_cmos_clock(struct work_struct *work)
}
getnstimeofday(&now);
- if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec / 2) {
+ if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec * 5) {
struct timespec adjust = now;
fail = -ENODEV;
--
1.7.9.5