Ticket #1542: pr1542,diff

Index: cpukit/libfs/src/pipe/fifo.c
===================================================================
RCS file: /usr1/CVS/rtems/cpukit/libfs/src/pipe/fifo.c,v
retrieving revision 1.8
diff -u -r1.8 fifo.c
--- cpukit/libfs/src/pipe/fifo.c        23 Jun 2010 05:01:46 -0000      1.8
+++ cpukit/libfs/src/pipe/fifo.c        24 Jun 2010 19:51:10 -0000
@@ -104,6 +104,8 @@
   if (! pipe->Buffer)
     goto err_buf;
 
+  err = -ENOMEM;
+
   if (rtems_barrier_create(
         rtems_build_name ('P', 'I', 'r', c),
         RTEMS_BARRIER_MANUAL_RELEASE, 0,
@@ -342,15 +344,17 @@
       break;
 
     case LIBIO_FLAGS_WRITE:
+      pipe->writerCounter ++;
+
+      if (pipe->Writers ++ == 0)
+        PIPE_WAKEUPREADERS(pipe);
+
       if (pipe->Readers == 0 && LIBIO_NODELAY(iop)) {
+       PIPE_UNLOCK(pipe);
         err = -ENXIO;
         goto out_error;
       }
 
-      pipe->writerCounter ++;
-      if (pipe->Writers ++ == 0)
-        PIPE_WAKEUPREADERS(pipe);
-
       if (pipe->Readers == 0) {
         prevCounter = pipe->readerCounter;
         err = -EINTR;