bonding: Use msecs_to_jiffies, eliminate panic

	Convert bonding to use msecs_to_jiffies instead of doing the
math.  For the ARP monitor, there was an underflow problem that could
result in an infinite loop.  The miimon already had that worked around,
but this is cleaner.

	Originally by Nicolas de Pesloüan <nicolas.2p.debian@free.fr>
Jay Vosburgh corrected a math error in the original; Nicolas' original
commit message is:

When setting arp_interval parameter to a very low value, delta_in_ticks
for next arp might become 0, causing an infinite loop.

See http://bugzilla.kernel.org/show_bug.cgi?id=10680

Same problem for miimon parameter already fixed, but fix might be
enhanced, by using msecs_to_jiffies() function.

Signed-off-by: Nicolas de Pesloüan <nicolas.2p.debian@free.fr>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 50a40e4..12c7158 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2397,7 +2397,7 @@ void bond_mii_monitor(struct work_struct *work)
                read_lock(&bond->lock);
        }
 
-       delay = ((bond->params.miimon * HZ) / 1000) ? : 1;
+       delay = msecs_to_jiffies(bond->params.miimon);
        read_unlock(&bond->lock);
        queue_delayed_work(bond->wq, &bond->mii_work, delay);
 }
@@ -2707,7 +2707,7 @@ void bond_loadbalance_arp_mon(struct work_struct *work)
 
        read_lock(&bond->lock);
 
-       delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
+       delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
 
        if (bond->kill_timers) {
                goto out;
@@ -2837,7 +2837,7 @@ void bond_activebackup_arp_mon(struct work_struct *work)
 
        read_lock(&bond->lock);
 
-       delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
+       delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
 
        if (bond->kill_timers) {
                goto out;