1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index ca4e429f9ec2..583c568e1764 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -260,6 +260,7 @@ static ssize_t bonding_store_slaves(struct device *d,
         char command[IFNAMSIZ + 1] = { 0, };
         char *ifname;
         int i, res, found, ret = count;
+        u32 original_mtu;
         struct slave *slave;
         struct net_device *dev = NULL;
         struct bonding *bond = to_bond(d);
@@ -325,6 +326,7 @@ static ssize_t bonding_store_slaves(struct device *d,
                 }
 
                 /* Set the slave's MTU to match the bond */
+                original_mtu = dev->mtu;
                 if (dev->mtu != bond->dev->mtu) {
                         if (dev->change_mtu) {
                                 res = dev->change_mtu(dev,
@@ -339,6 +341,9 @@ static ssize_t bonding_store_slaves(struct device *d,
                 }
                 rtnl_lock();
                 res = bond_enslave(bond->dev, dev);
+                bond_for_each_slave(bond, slave, i)
+                        if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0)
+                                slave->original_mtu = original_mtu;
                 rtnl_unlock();
                 if (res) {
                         ret = res;
@@ -351,6 +356,7 @@ static ssize_t bonding_store_slaves(struct device *d,
                 bond_for_each_slave(bond, slave, i)
                         if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
                                 dev = slave->dev;
+                                original_mtu = slave->original_mtu;
                                 break;
                         }
                 if (dev) {
@@ -365,9 +371,9 @@ static ssize_t bonding_store_slaves(struct device *d,
                         }
                         /* set the slave MTU to the default */
                         if (dev->change_mtu) {
-                                dev->change_mtu(dev, 1500);
+                                dev->change_mtu(dev, original_mtu);
                         } else {
-                                dev->mtu = 1500;
+                                dev->mtu = original_mtu;
                         }
                 }
                 else {