From patchwork Thu Oct  2 10:42:44 2008
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Subject: tcp FRTO: in-order-only "TCP proxy" fragility workaround (fwd)
Date: Thu, 02 Oct 2008 00:42:44 -0000
From: Thomas Gleixner <tglx@linutronix.de>
X-Patchwork-Id: 2375
Message-Id: <alpine.LFD.1.10.0810021142370.5549@apollo.tec.linutronix.de>
To: =?ISO-8859-15?Q?D=E2niel_Fraga?= <fragabr@gmail.com>
Cc: =?ISO-8859-15?Q?Ilpo_J=E4rvinen?= <ilpo.jarvinen@helsinki.fi>,
 David Miller <davem@davemloft.net>, Netdev <netdev@vger.kernel.org>


diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index f6e3af3..a1cecb0 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -68,6 +68,12 @@ static void ftrace_list_func(unsigned long ip, unsigned long parent_ip)
 	};
 }
 
+void stop_event_tracer_now(void)
+{
+	tracer_enabled = 0;
+	printk(KERN_INFO "Tracer stopped\n");
+}
+
 /**
  * clear_ftrace_function - reset the ftrace function
  *
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index f976fc5..527dd45 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -485,6 +485,8 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
 	return newsk;
 }
 
+extern void stop_event_tracer_now(void);
+
 /*
  *	Process an incoming packet for SYN_RECV sockets represented
  *	as a request_sock.
@@ -687,6 +689,7 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
 	return child;
 
 listen_overflow:
+	stop_event_tracer_now();
 	if (!sysctl_tcp_abort_on_overflow) {
 		inet_rsk(req)->acked = 1;
 		return NULL;