[ 3.5.y.z extended stable ] Patch "bonding: don't call update_speed_duplex() under spinlocks" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Mon Mar 25 18:03:57 UTC 2013

This is a note to let you know that I have just added a patch titled

    bonding: don't call update_speed_duplex() under spinlocks

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



>From 5e17fed1a4b7ed360faad7c8fb1006dd0ab4e711 Mon Sep 17 00:00:00 2001
From: Veaceslav Falico <vfalico at redhat.com>
Date: Tue, 12 Mar 2013 06:31:32 +0000
Subject: [PATCH] bonding: don't call update_speed_duplex() under spinlocks

commit 876254ae2758d50dcb08c7bd00caf6a806571178 upstream.

bond_update_speed_duplex() might sleep while calling underlying slave's
routines. Move it out of atomic context in bond_enslave() and remove it
from bond_miimon_commit() - it was introduced by commit 546add79, however
when the slave interfaces go up/change state it's their responsibility to
fire NETDEV_UP/NETDEV_CHANGE events so that bonding can properly update
their speed.

I've tested it on all combinations of ifup/ifdown, autoneg/speed/duplex
changes, remote-controlled and local, on (not) MII-based cards. All changes
are visible.

Signed-off-by: Veaceslav Falico <vfalico at redhat.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
 drivers/net/bonding/bond_main.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 2466847..a8406dc 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1737,6 +1737,8 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)


+	bond_update_speed_duplex(new_slave);

 	new_slave->last_arp_rx = jiffies -
@@ -1789,8 +1791,6 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 		new_slave->link == BOND_LINK_DOWN ? "DOWN" :
 			(new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));

-	bond_update_speed_duplex(new_slave);
 	if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
 		/* if there is a primary slave, remember it */
 		if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
@@ -2471,8 +2471,6 @@ static void bond_miimon_commit(struct bonding *bond)

-			bond_update_speed_duplex(slave);
 			pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
 				bond->dev->name, slave->dev->name,
 				slave->speed, slave->duplex ? "full" : "half");

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