From 2b735daae5fb5e2d0ae0cadd4da8b2715989d6d2 Mon Sep 17 00:00:00 2001
From: Kevin O'Connor <kevin@koconnor.net>
Date: Wed, 29 Mar 2017 13:01:35 -0400
Subject: [PATCH] timer: Make sure to reset the timer repeat checks on a
 shutdown

Reset the timer repeat checks on shutdown, otherwise it is possible to
get into an infinite shutdown loop.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
---
 src/avr/timer.c     | 19 ++++++++++---------
 src/generic/timer.c |  7 +++++++
 2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/src/avr/timer.c b/src/avr/timer.c
index 588669c1..e9ec8dd0 100644
--- a/src/avr/timer.c
+++ b/src/avr/timer.c
@@ -95,15 +95,6 @@ timer_init(void)
 }
 DECL_INIT(timer_init);
 
-static void
-timer_shutdown(void)
-{
-    // Reenable timer irq
-    timer_set(timer_get() + 50);
-    TIFR1 = 1<<OCF1A;
-}
-DECL_SHUTDOWN(timer_shutdown);
-
 
 /****************************************************************
  * 32bit timer wrappers
@@ -208,3 +199,13 @@ timer_task(void)
     irq_enable();
 }
 DECL_TASK(timer_task);
+
+static void
+timer_shutdown(void)
+{
+    // Reenable timer irq
+    timer_set(timer_get() + 50);
+    TIFR1 = 1<<OCF1A;
+    timer_repeat_set(timer_get() + TIMER_IDLE_REPEAT_TICKS);
+}
+DECL_SHUTDOWN(timer_shutdown);
diff --git a/src/generic/timer.c b/src/generic/timer.c
index 256ccb3d..5185ed54 100644
--- a/src/generic/timer.c
+++ b/src/generic/timer.c
@@ -94,3 +94,10 @@ timer_task(void)
     irq_enable();
 }
 DECL_TASK(timer_task);
+
+static void
+timer_irq_shutdown(void)
+{
+    timer_repeat_until = timer_read_time() + TIMER_IDLE_REPEAT_TICKS;
+}
+DECL_SHUTDOWN(timer_irq_shutdown);