From ab4df227d466e881e4279821b5fc1563f0e7e933 Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay@vrfy.org>
Date: Tue, 2 Sep 2014 15:28:56 +0200
Subject: [PATCH] Revert "timesyncd: remove retry_timer logic which is covered
 by the server timeout"

This reverts commit 665c6a9eab46b0b253af6566ca9fc70c866b3fcd.

On Tue, Sep 2, 2014 at 3:17 PM, Miroslav Lichvar <mlichvar@redhat.com> wrote:
>
> With the other patch allowing missed replies included it's now getting
> stuck as there is no timer to send the 2nd and 3rd request.
---
 src/timesync/timesyncd-manager.c | 14 ++++++++++++++
 src/timesync/timesyncd-manager.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/src/timesync/timesyncd-manager.c b/src/timesync/timesyncd-manager.c
index 3261bc1fb1..a5678ccaed 100644
--- a/src/timesync/timesyncd-manager.c
+++ b/src/timesync/timesyncd-manager.c
@@ -209,6 +209,19 @@ static int manager_send_request(Manager *m) {
                 return manager_connect(m);
         }
 
+        /* re-arm timer with increasing timeout, in case the packets never arrive back */
+        if (m->retry_interval > 0) {
+                if (m->retry_interval < NTP_POLL_INTERVAL_MAX_SEC * USEC_PER_SEC)
+                        m->retry_interval *= 2;
+        } else
+                m->retry_interval = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC;
+
+        r = manager_arm_timer(m, m->retry_interval);
+        if (r < 0) {
+                log_error("Failed to rearm timer: %s", strerror(-r));
+                return r;
+        }
+
         m->missed_replies++;
         if (m->missed_replies > NTP_MAX_MISSED_REPLIES) {
                 r = sd_event_add_time(
@@ -596,6 +609,7 @@ static int manager_receive_response(sd_event_source *source, int fd, uint32_t re
 
         /* valid packet */
         m->pending = false;
+        m->retry_interval = 0;
 
         /* announce leap seconds */
         if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_PLUSSEC)
diff --git a/src/timesync/timesyncd-manager.h b/src/timesync/timesyncd-manager.h
index 8296d41295..c7efdc5dfb 100644
--- a/src/timesync/timesyncd-manager.h
+++ b/src/timesync/timesyncd-manager.h
@@ -60,6 +60,7 @@ struct Manager {
         /* last sent packet */
         struct timespec trans_time_mon;
         struct timespec trans_time;
+        usec_t retry_interval;
         bool pending;
 
         /* poll timer */