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Commit 3795da47 authored by Wong Hoi Sing Edison's avatar Wong Hoi Sing Edison Committed by David S. Miller
Browse files

[TCP] tcp-lp: bug fix for oops in 2.6.18-rc6 



Sorry that the patch submited yesterday still contain a small bug.
This version have already been test for hours with BT connections. The
oops is now difficult to reproduce.

Signed-off-by: default avatarWong Hoi Sing Edison <hswong3i@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 485c2967

net/ipv4/tcp_lp.c

+21 −14
Original line number Diff line number Diff line
@@ -3,13 +3,8 @@ 
 *

 * TCP Low Priority is a distributed algorithm whose goal is to utilize only

 *   the excess network bandwidth as compared to the ``fair share`` of

 *   bandwidth as targeted by TCP. Available from:

 *     http://www.ece.rice.edu/~akuzma/Doc/akuzma/TCP-LP.pdf

 *

 * Original Author:

 *   Aleksandar Kuzmanovic <akuzma@northwestern.edu>

 *   bandwidth as targeted by TCP.

 *

 * See http://www-ece.rice.edu/networks/TCP-LP/ for their implementation.

 * As of 2.6.13, Linux supports pluggable congestion control algorithms.

 * Due to the limitation of the API, we take the following changes from

 * the original TCP-LP implementation:
@@ -24,11 +19,20 @@ 
 *   o OWD is handled in relative format, where local time stamp will in

 *     tcp_time_stamp format.

 *

 * Port from 2.4.19 to 2.6.16 as module by:

 *   Wong Hoi Sing Edison <hswong3i@gmail.com>

 *   Hung Hing Lun <hlhung3i@gmail.com>

 * Original Author:

 *   Aleksandar Kuzmanovic <akuzma@northwestern.edu>

 * Available from:

 *   http://www.ece.rice.edu/~akuzma/Doc/akuzma/TCP-LP.pdf

 * Original implementation for 2.4.19:

 *   http://www-ece.rice.edu/networks/TCP-LP/

 *

 * 2.6.x module Authors:

 *   Wong Hoi Sing, Edison <hswong3i@gmail.com>

 *   Hung Hing Lun, Mike <hlhung3i@gmail.com>

 * SourceForge project page:

 *   http://tcp-lp-mod.sourceforge.net/

 *

 * Version: $Id: tcp_lp.c,v 1.22 2006-05-02 18:18:19 hswong3i Exp $

 * Version: $Id: tcp_lp.c,v 1.24 2006/09/05 20:22:53 hswong3i Exp $

 */



#include <linux/config.h>
@@ -153,16 +157,19 @@ static u32 tcp_lp_remote_hz_estimator(struct sock *sk) 
	if (m < 0)

		m = -m;



	if (rhz != 0) {

	if (rhz > 0) {

		m -= rhz >> 6;	/* m is now error in remote HZ est */

		rhz += m;	/* 63/64 old + 1/64 new */

	} else

		rhz = m << 6;



 out:

	/* record time for successful remote HZ calc */

	if (rhz > 0)

		lp->flag |= LP_VALID_RHZ;

	else

		lp->flag &= ~LP_VALID_RHZ;



 out:

	/* record reference time stamp */

	lp->remote_ref_time = tp->rx_opt.rcv_tsval;

	lp->local_ref_time = tp->rx_opt.rcv_tsecr;
@@ -333,6 +340,6 @@ static void __exit tcp_lp_unregister(void) 
module_init(tcp_lp_register);

module_exit(tcp_lp_unregister);



MODULE_AUTHOR("Wong Hoi Sing Edison, Hung Hing Lun");

MODULE_AUTHOR("Wong Hoi Sing Edison, Hung Hing Lun Mike");

MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("TCP Low Priority");