From 4ddadd5622b2248784cc171568fdcb709d9980e2 Mon Sep 17 00:00:00 2001
From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Thu, 1 Feb 2018 17:24:26 +0100
Subject: [PATCH] ntp: don't request TX timestamp when SW/HW timestamping is
 disabled

---
 ntp_io_linux.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ntp_io_linux.c b/ntp_io_linux.c
index 00caed0..8edcfcc 100644
--- a/ntp_io_linux.c
+++ b/ntp_io_linux.c
@@ -682,6 +682,9 @@ NIO_Linux_RequestTxTimestamp(struct msghdr *msg, int cmsglen, int sock_fd)
 {
   struct cmsghdr *cmsg;
 
+  if (!ts_flags)
+    return cmsglen;
+
   /* Check if TX timestamping is disabled on this socket */
   if (permanent_ts_options || !NIO_IsServerSocket(sock_fd))
     return cmsglen;