From dbbe46a2bce9b88266e7e40ee3717eca188c4f3a Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Thu, 3 Nov 2016 12:23:31 -0600
Subject: [PATCH] fs: Disable priority inheritance on all semaphores used for
 signaling

---
 fs/vfs/fs_poll.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/vfs/fs_poll.c b/fs/vfs/fs_poll.c
index 605147ec7f..e2c66abf7b 100644
--- a/fs/vfs/fs_poll.c
+++ b/fs/vfs/fs_poll.c
@@ -47,9 +47,9 @@
 #include <errno.h>
 
 #include <nuttx/clock.h>
+#include <nuttx/semaphore.h>
 #include <nuttx/fs/fs.h>
 #include <nuttx/net/net.h>
-#include <nuttx/semaphore.h>
 
 #include <arch/irq.h>
 
@@ -365,7 +365,13 @@ int poll(FAR struct pollfd *fds, nfds_t nfds, int timeout)
   int errcode;
   int ret;
 
+  /* This semaphore is used for signaling and, hence, should not have
+   * priority inheritance enabled.
+   */
+
   sem_init(&sem, 0, 0);
+  sem_setprotocol(&sem, SEM_PRIO_NONE);
+
   ret = poll_setup(fds, nfds, &sem);
   if (ret >= 0)
     {