[TCP] tcp-lp: prevent chance for oops

This patch fix the chance for tcp_lp_remote_hz_estimator return 0, if
0 < rhz < 64. It also make sure the flag LP_VALID_RHZ is set
correctly.

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 308fb7e..f0ebaf0 100644 (file)
--- a/net/ipv4/tcp_lp.c
+++ b/net/ipv4/tcp_lp.c
@@ -31,8 +31,6 @@
  *   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/module.h>
@@ -164,7 +162,7 @@ static u32 tcp_lp_remote_hz_estimator(struct sock *sk)
 
  out:
        /* record time for successful remote HZ calc */
-       if (rhz > 0)
+       if ((rhz >> 6) > 0)
                lp->flag |= LP_VALID_RHZ;
        else
                lp->flag &= ~LP_VALID_RHZ;