From c2f6417bea7791ee5189626573a866585b66f6b5 Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Wed, 7 Oct 2015 18:55:13 +0200
Subject: [PATCH] sys: xtimer: add another safeguard against setting a timer in
the past
---
sys/xtimer/xtimer_core.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/sys/xtimer/xtimer_core.c b/sys/xtimer/xtimer_core.c
index 97b336f0c4..92db65faab 100644
--- a/sys/xtimer/xtimer_core.c
+++ b/sys/xtimer/xtimer_core.c
@@ -482,6 +482,11 @@ overflow:
if (timer_list_head) {
/* schedule callback on next timer target time */
next_target = timer_list_head->target - XTIMER_OVERHEAD;
+
+ /* make sure we're not setting a time in the past */
+ if (next_target < (_xtimer_now() + XTIMER_ISR_BACKOFF)) {
+ goto overflow;
+ }
}
else {
/* there's no timer planned for this timer period */
--
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