From 81115166a703f993c76b3ed0c627d7a27fd4077e Mon Sep 17 00:00:00 2001
From: px4dev <px4@purgatory.org>
Date: Wed, 9 Jan 2013 21:40:42 -0800
Subject: [PATCH] Fix clock_time2ticks to round up, not down. This makes
 sem_timedwait for at least the necessary period.

---
 nuttx/sched/clock_time2ticks.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nuttx/sched/clock_time2ticks.c b/nuttx/sched/clock_time2ticks.c
index 383264d513..9265872bb6 100644
--- a/nuttx/sched/clock_time2ticks.c
+++ b/nuttx/sched/clock_time2ticks.c
@@ -97,6 +97,6 @@ int clock_time2ticks(FAR const struct timespec *reltime, FAR int *ticks)
 
   /* Convert microseconds to clock ticks */
 
-  *ticks = relusec / USEC_PER_TICK;
+  *ticks = (relusec + USEC_PER_TICK - 1) / USEC_PER_TICK;
   return OK;
 }