From d76f6bff4f7561f6cf071108b8db5756fe9a3909 Mon Sep 17 00:00:00 2001
From: gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Wed, 12 Mar 2008 16:38:58 +0000
Subject: git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@227
 35acf78f-673a-0410-8e92-d51de3d6d3f4

---
 src/chsem.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/chsem.c b/src/chsem.c
index 6953fb846..14b8567ad 100644
--- a/src/chsem.c
+++ b/src/chsem.c
@@ -174,8 +174,13 @@ void chSemSignal(Semaphore *sp) {
  */
 void chSemSignalI(Semaphore *sp) {
 
-  if (sp->s_cnt++ < 0)
-    chSchReadyI(fifo_remove(&sp->s_queue))->p_rdymsg = RDY_OK;
+  if (sp->s_cnt++ < 0) {
+    /* NOTE: It is done this way in order to allow a tail call on
+             chSchReadyI().*/
+    Thread *tp = fifo_remove(&sp->s_queue);
+    tp->p_rdymsg = RDY_OK;
+    chSchReadyI(tp);
+  }
 }
 
 #ifdef CH_USE_SEMSW
-- 
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