From 1c06e1446e46bb1053035923b5367a86ec8815cc Mon Sep 17 00:00:00 2001
From: Giovanni Di Sirio <gdisirio@gmail.com>
Date: Thu, 21 Jan 2016 14:27:29 +0000
Subject: [PATCH] Fixed bug #695.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@8788 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/hal/src/hal_buffers.c | 22 ++++++----------------
 readme.txt               |  4 +++-
 2 files changed, 9 insertions(+), 17 deletions(-)

diff --git a/os/hal/src/hal_buffers.c b/os/hal/src/hal_buffers.c
index 68c30c5a4..2f4e0339c 100644
--- a/os/hal/src/hal_buffers.c
+++ b/os/hal/src/hal_buffers.c
@@ -365,14 +365,9 @@ size_t ibqReadTimeout(input_buffers_queue_t *ibqp, uint8_t *bp,
     if (ibqp->ptr == NULL) {
       msg_t msg;
 
-      /* TIME_IMMEDIATE is a special case, never wait.*/
-      if (timeout == TIME_IMMEDIATE) {
-        osalSysUnlock();
-        return r;
-      }
-
-      /* TIME_INFINITE is handled differently, no deadline.*/
-      if (timeout == TIME_INFINITE) {
+      /* TIME_INFINITE and TIME_IMMEDIATE are handled differently, no
+         deadline.*/
+      if ((timeout == TIME_INFINITE) || (timeout == TIME_IMMEDIATE)) {
         msg = ibqGetFullBufferTimeoutS(ibqp, timeout);
       }
       else {
@@ -743,14 +738,9 @@ size_t obqWriteTimeout(output_buffers_queue_t *obqp, const uint8_t *bp,
     if (obqp->ptr == NULL) {
       msg_t msg;
 
-      /* TIME_IMMEDIATE is a special case, never wait.*/
-      if (timeout == TIME_IMMEDIATE) {
-        osalSysUnlock();
-        return w;
-      }
-
-      /* TIME_INFINITE is handled differently, no deadline.*/
-      if (timeout == TIME_INFINITE) {
+      /* TIME_INFINITE and TIME_IMMEDIATE are handled differently, no
+         deadline.*/
+      if ((timeout == TIME_INFINITE) || (timeout == TIME_IMMEDIATE)) {
         msg = obqGetEmptyBufferTimeoutS(obqp, timeout);
       }
       else {
diff --git a/readme.txt b/readme.txt
index 136cf3ca8..cd1b26abf 100644
--- a/readme.txt
+++ b/readme.txt
@@ -76,7 +76,9 @@
 - RT:  Removed the p_msg field from the thread_t structure saving a
        msg_t-sized field from the structure. Messages now use a new field
        into the p_u union. Now synchronous messages are even faster.
-- NIL: NIL_CFG_USE_EVENTS not properly checked in NIL (bug #694)
+- HAL: Fixed incorrect handling of TIME_IMMEDIATE in the HAL buffer queues
+       (bug #695)(backported to 16.1.2).
+- NIL: Fixed NIL_CFG_USE_EVENTS not properly checked in NIL (bug #694)
        (backported to 3.0.5 and 16.1.1).
 - RT:  Fixed ISR statistics are not updated from a critical zone in RT
        (bug #693)(backported to 3.0.5 and 16.1.1).