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From: John Baldwin <jhb@FreeBSD.org>
Date: Fri, 4 Feb 2011 14:13:16 +0000 (UTC)
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Subject: svn commit: r218271 - head/sys/netinet
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Author: jhb
Date: Fri Feb  4 14:13:15 2011
New Revision: 218271
URL: http://svn.freebsd.org/changeset/base/218271

Log:
  When turning off TCP_NOPUSH, only call tcp_output() to immediately flush
  any pending data if the connection is established.
  
  Submitted by:	csjp
  Reviewed by:	lstewart
  MFC after:	1 week

Modified:
  head/sys/netinet/tcp_usrreq.c

Modified: head/sys/netinet/tcp_usrreq.c
==============================================================================
--- head/sys/netinet/tcp_usrreq.c	Fri Feb  4 14:06:57 2011	(r218270)
+++ head/sys/netinet/tcp_usrreq.c	Fri Feb  4 14:13:15 2011	(r218271)
@@ -1328,9 +1328,10 @@ tcp_ctloutput(struct socket *so, struct 
 			INP_WLOCK_RECHECK(inp);
 			if (optval)
 				tp->t_flags |= TF_NOPUSH;
-			else {
+			else if (tp->t_flags & TF_NOPUSH) {
 				tp->t_flags &= ~TF_NOPUSH;
-				error = tcp_output(tp);
+				if (TCPS_HAVEESTABLISHED(tp->t_state))
+					error = tcp_output(tp);
 			}
 			INP_WUNLOCK(inp);
 			break;