diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
index b4269139135b..87f9f3ef3b2d 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -1458,7 +1458,7 @@ static ssize_t set_mode(struct device *d, struct device_attribute *attr,
 			if (priv->hca_caps & IB_DEVICE_UD_TSO)
 				dev->features |= NETIF_F_TSO;
 		}
-		dev->mtu = min(priv->mcast_mtu, dev->mtu);
+		dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
 		rtnl_unlock();
 		ipoib_flush_paths(dev);
 
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index be1ed38cdcfd..1fcc9a898d81 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -577,7 +577,7 @@ void ipoib_mcast_join_task(struct work_struct *work)
 
 	if (!ipoib_cm_admin_enabled(dev)) {
 		rtnl_lock();
-		dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
+		dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
 		rtnl_unlock();
 	}