From d0d72baa87964a4f76f34949b16a02736ca04bdf Mon Sep 17 00:00:00 2001
From: gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Mon, 21 Jun 2010 17:05:53 +0000
Subject: Fixed bug 3019158.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@2028 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/kernel/src/chqueues.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'os')

diff --git a/os/kernel/src/chqueues.c b/os/kernel/src/chqueues.c
index 651b79f4e..84cbbed94 100644
--- a/os/kernel/src/chqueues.c
+++ b/os/kernel/src/chqueues.c
@@ -154,7 +154,8 @@ msg_t chIQGetTimeout(InputQueue *iqp, systime_t time) {
  *
  * @param[in] iqp       pointer to an @p InputQueue structure
  * @param[out] bp       pointer to the data buffer
- * @param[in] n         the maximum amount of data to be transferred
+ * @param[in] n         the maximum amount of data to be transferred, the
+ *                      value 0 is reserved
  * @param[in] time      the number of ticks before the operation timeouts,
  *                      the following special values are allowed:
  *                      - @a TIME_IMMEDIATE immediate timeout.
@@ -167,6 +168,8 @@ size_t chIQReadTimeout(InputQueue *iqp, uint8_t *bp,
   qnotify_t nfy = iqp->q_notify;
   size_t r = 0;
 
+  chDbgCheck(n > 0, "chIQReadTimeout");
+
   chSysLock();
   while (TRUE) {
     if (chIQIsEmpty(iqp)) {
@@ -304,7 +307,8 @@ msg_t chOQGetI(OutputQueue *oqp) {
  *
  * @param[in] oqp       pointer to an @p OutputQueue structure
  * @param[out] bp       pointer to the data buffer
- * @param[in] n         the maximum amount of data to be transferred
+ * @param[in] n         the maximum amount of data to be transferred, the
+ *                      value 0 is reserved
  * @param[in] time      the number of ticks before the operation timeouts,
  *                      the following special values are allowed:
  *                      - @a TIME_IMMEDIATE immediate timeout.
@@ -317,6 +321,8 @@ size_t chOQWriteTimeout(OutputQueue *oqp, const uint8_t *bp,
   qnotify_t nfy = oqp->q_notify;
   size_t w = 0;
 
+  chDbgCheck(n > 0, "chOQWriteTimeout");
+
   chSysLock();
   while (TRUE) {
     if (chOQIsFull(oqp)) {
-- 
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