Commit b63bb739 authored by David Sterba's avatar David Sterba Committed by Jeff Garzik

bonding: Fix time comparison

From: David Sterba <dsterba@suse.cz>

Use macros for comparing jiffies. Jiffies' wrap caused missed events and hangs.
Module reinsert was needed to make bonding work again.
Signed-off-by: default avatarDavid Sterba <dsterba@suse.cz>
Acked-by: default avatarJay Vosburgh <fubar@us.ibm.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 8e4b9329
......@@ -74,6 +74,7 @@
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/if_bonding.h>
#include <linux/jiffies.h>
#include <net/route.h>
#include <net/net_namespace.h>
#include "bonding.h"
......@@ -2722,8 +2723,8 @@ void bond_loadbalance_arp_mon(struct work_struct *work)
*/
bond_for_each_slave(bond, slave, i) {
if (slave->link != BOND_LINK_UP) {
if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
if (time_before_eq(jiffies, slave->dev->trans_start + delta_in_ticks) &&
time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
slave->link = BOND_LINK_UP;
slave->state = BOND_STATE_ACTIVE;
......@@ -2754,8 +2755,8 @@ void bond_loadbalance_arp_mon(struct work_struct *work)
* when the source ip is 0, so don't take the link down
* if we don't know our ip yet
*/
if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
(((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
if (time_after_eq(jiffies, slave->dev->trans_start + 2*delta_in_ticks) ||
(time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks) &&
bond_has_ip(bond))) {
slave->link = BOND_LINK_DOWN;
......@@ -2848,8 +2849,8 @@ void bond_activebackup_arp_mon(struct work_struct *work)
*/
bond_for_each_slave(bond, slave, i) {
if (slave->link != BOND_LINK_UP) {
if ((jiffies - slave_last_rx(bond, slave)) <=
delta_in_ticks) {
if (time_before_eq(jiffies,
slave_last_rx(bond, slave) + delta_in_ticks)) {
slave->link = BOND_LINK_UP;
......@@ -2858,7 +2859,7 @@ void bond_activebackup_arp_mon(struct work_struct *work)
write_lock_bh(&bond->curr_slave_lock);
if ((!bond->curr_active_slave) &&
((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
time_before_eq(jiffies, slave->dev->trans_start + delta_in_ticks)) {
bond_change_active_slave(bond, slave);
bond->current_arp_slave = NULL;
} else if (bond->curr_active_slave != slave) {
......@@ -2897,7 +2898,7 @@ void bond_activebackup_arp_mon(struct work_struct *work)
if ((slave != bond->curr_active_slave) &&
(!bond->current_arp_slave) &&
(((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
(time_after_eq(jiffies, slave_last_rx(bond, slave) + 3*delta_in_ticks) &&
bond_has_ip(bond))) {
/* a backup slave has gone down; three times
* the delta allows the current slave to be
......@@ -2943,10 +2944,10 @@ void bond_activebackup_arp_mon(struct work_struct *work)
* before being taken out. if a primary is being used, check
* if it is up and needs to take over as the curr_active_slave
*/
if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
(((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
bond_has_ip(bond))) &&
((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
if ((time_after_eq(jiffies, slave->dev->trans_start + 2*delta_in_ticks) ||
(time_after_eq(jiffies, slave_last_rx(bond, slave) + 2*delta_in_ticks) &&
bond_has_ip(bond))) &&
time_after_eq(jiffies, slave->jiffies + 2*delta_in_ticks)) {
slave->link = BOND_LINK_DOWN;
......
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