[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: Wong Hoi Sing Edison <hswong3i@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_lp.c b/net/ipv4/tcp_lp.c
index 1f977b6..48f28d6 100644
--- a/net/ipv4/tcp_lp.c
+++ b/net/ipv4/tcp_lp.c
@@ -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
+ * bandwidth as targeted by TCP.
*
- * Original Author:
- * Aleksandar Kuzmanovic <akuzma@northwestern.edu>
- *
- * 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/
*
- * Version: $Id: tcp_lp.c,v 1.22 2006-05-02 18:18:19 hswong3i Exp $
+ * 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 1.24 2006/09/05 20:22:53 hswong3i Exp $
*/
#include <linux/config.h>
@@ -153,16 +157,19 @@
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;
- /* record time for successful remote HZ calc */
- lp->flag |= LP_VALID_RHZ;
-
out:
+ /* record time for successful remote HZ calc */
+ if (rhz > 0)
+ lp->flag |= LP_VALID_RHZ;
+ else
+ lp->flag &= ~LP_VALID_RHZ;
+
/* 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 @@
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");