[rtems commit] mw_uid: corrects uid_read_message short timeouts

[Gedare Bloom]

Module:    rtems
Branch:    master
Commit:    66bf2cc9095feb424eadbe1018f704d13a026e5d
Changeset: http://git.rtems.org/rtems/commit/?id=66bf2cc9095feb424eadbe1018f704d13a026e5d

Author:    Allan Hessenflow <allanh at kallisti.com>
Date:      Wed Dec 18 18:54:53 2013 -0600

mw_uid: corrects uid_read_message short timeouts

---

 cpukit/libmisc/fb/mw_uid.c |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/cpukit/libmisc/fb/mw_uid.c b/cpukit/libmisc/fb/mw_uid.c
index cb138dc..a911e09 100644
--- a/cpukit/libmisc/fb/mw_uid.c
+++ b/cpukit/libmisc/fb/mw_uid.c
@@ -90,15 +90,24 @@ int uid_read_message( struct MW_UID_MESSAGE *m, unsigned long timeout )
 {
   rtems_status_code status;
   size_t            size = 0;
-  unsigned long     micro_secs = timeout*1000;
   int               wait = (timeout != 0);
+  int ticks = RTEMS_MICROSECONDS_TO_TICKS(timeout * 1000);
+
+  if (timeout == (unsigned long) -1) {
+    ticks = RTEMS_NO_TIMEOUT;
+  } else if (timeout && ticks == 0) {
+    /* if timeout greater than 0 and smaller than a tick, round up to avoid
+     * unintentionally RTEMS_NO_TIMEOUT
+     */
+    ticks = 1;
+  }
 
   status = rtems_message_queue_receive(
    queue_id,
    (void*)m,
    &size,
    wait ? RTEMS_WAIT : RTEMS_NO_WAIT,
-   RTEMS_MICROSECONDS_TO_TICKS(micro_secs)
+   ticks
   );
 
   if( status == RTEMS_SUCCESSFUL ) {