bonding: extract the use of real_device into local variable

Add a local variable for slave->dev, to prepare for the lock change in
the next patch. There is no functionality change.

Fixes: 9a560550 ("bonding: Add struct bond_ipesc to manage SA")
Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Jay Vosburgh <jv@jvosburgh.net>
Link: https://patch.msgid.link/20240823031056.110999-3-jianbol@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/bonding/bond_main.c

@@ -427,6 +427,7 @@ static int bond_ipsec_add_sa(struct xfrm_state *xs,
 			     struct netlink_ext_ack *extack)
 {
 	struct net_device *bond_dev = xs->xso.dev;
+	struct net_device *real_dev;
 	struct bond_ipsec *ipsec;
 	struct bonding *bond;
 	struct slave *slave;
@@ -443,9 +444,10 @@ static int bond_ipsec_add_sa(struct xfrm_state *xs,
 		return -ENODEV;
 	}
 
-	if (!slave->dev->xfrmdev_ops ||
-	    !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
-	    netif_is_bond_master(slave->dev)) {
+	real_dev = slave->dev;
+	if (!real_dev->xfrmdev_ops ||
+	    !real_dev->xfrmdev_ops->xdo_dev_state_add ||
+	    netif_is_bond_master(real_dev)) {
 		NL_SET_ERR_MSG_MOD(extack, "Slave does not support ipsec offload");
 		rcu_read_unlock();
 		return -EINVAL;
@@ -456,9 +458,9 @@ static int bond_ipsec_add_sa(struct xfrm_state *xs,
 		rcu_read_unlock();
 		return -ENOMEM;
 	}
-	xs->xso.real_dev = slave->dev;
 
-	err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs, extack);
+	xs->xso.real_dev = real_dev;
+	err = real_dev->xfrmdev_ops->xdo_dev_state_add(xs, extack);
 	if (!err) {
 		ipsec->xs = xs;
 		INIT_LIST_HEAD(&ipsec->list);
@@ -475,6 +477,7 @@ static int bond_ipsec_add_sa(struct xfrm_state *xs,
 static void bond_ipsec_add_sa_all(struct bonding *bond)
 {
 	struct net_device *bond_dev = bond->dev;
+	struct net_device *real_dev;
 	struct bond_ipsec *ipsec;
 	struct slave *slave;
 
@@ -483,12 +486,13 @@ static void bond_ipsec_add_sa_all(struct bonding *bond)
 	if (!slave)
 		goto out;
 
-	if (!slave->dev->xfrmdev_ops ||
-	    !slave->dev->xfrmdev_ops->xdo_dev_state_add ||
-	    netif_is_bond_master(slave->dev)) {
+	real_dev = slave->dev;
+	if (!real_dev->xfrmdev_ops ||
+	    !real_dev->xfrmdev_ops->xdo_dev_state_add ||
+	    netif_is_bond_master(real_dev)) {
 		spin_lock_bh(&bond->ipsec_lock);
 		if (!list_empty(&bond->ipsec_list))
-			slave_warn(bond_dev, slave->dev,
+			slave_warn(bond_dev, real_dev,
 				   "%s: no slave xdo_dev_state_add\n",
 				   __func__);
 		spin_unlock_bh(&bond->ipsec_lock);
@@ -497,9 +501,9 @@ static void bond_ipsec_add_sa_all(struct bonding *bond)
 
 	spin_lock_bh(&bond->ipsec_lock);
 	list_for_each_entry(ipsec, &bond->ipsec_list, list) {
-		ipsec->xs->xso.real_dev = slave->dev;
-		if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs, NULL)) {
-			slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__);
+		ipsec->xs->xso.real_dev = real_dev;
+		if (real_dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs, NULL)) {
+			slave_warn(bond_dev, real_dev, "%s: failed to add SA\n", __func__);
 			ipsec->xs->xso.real_dev = NULL;
 		}
 	}
@@ -515,6 +519,7 @@ static void bond_ipsec_add_sa_all(struct bonding *bond)
 static void bond_ipsec_del_sa(struct xfrm_state *xs)
 {
 	struct net_device *bond_dev = xs->xso.dev;
+	struct net_device *real_dev;
 	struct bond_ipsec *ipsec;
 	struct bonding *bond;
 	struct slave *slave;
@@ -532,16 +537,17 @@ static void bond_ipsec_del_sa(struct xfrm_state *xs)
 	if (!xs->xso.real_dev)
 		goto out;
 
-	WARN_ON(xs->xso.real_dev != slave->dev);
+	real_dev = slave->dev;
+	WARN_ON(xs->xso.real_dev != real_dev);
 
-	if (!slave->dev->xfrmdev_ops ||
-	    !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
-	    netif_is_bond_master(slave->dev)) {
-		slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
+	if (!real_dev->xfrmdev_ops ||
+	    !real_dev->xfrmdev_ops->xdo_dev_state_delete ||
+	    netif_is_bond_master(real_dev)) {
+		slave_warn(bond_dev, real_dev, "%s: no slave xdo_dev_state_delete\n", __func__);
 		goto out;
 	}
 
-	slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
+	real_dev->xfrmdev_ops->xdo_dev_state_delete(xs);
 out:
 	spin_lock_bh(&bond->ipsec_lock);
 	list_for_each_entry(ipsec, &bond->ipsec_list, list) {
@@ -558,6 +564,7 @@ static void bond_ipsec_del_sa(struct xfrm_state *xs)
 static void bond_ipsec_del_sa_all(struct bonding *bond)
 {
 	struct net_device *bond_dev = bond->dev;
+	struct net_device *real_dev;
 	struct bond_ipsec *ipsec;
 	struct slave *slave;
 
@@ -568,21 +575,22 @@ static void bond_ipsec_del_sa_all(struct bonding *bond)
 		return;
 	}
 
+	real_dev = slave->dev;
 	spin_lock_bh(&bond->ipsec_lock);
 	list_for_each_entry(ipsec, &bond->ipsec_list, list) {
 		if (!ipsec->xs->xso.real_dev)
 			continue;
 
-		if (!slave->dev->xfrmdev_ops ||
-		    !slave->dev->xfrmdev_ops->xdo_dev_state_delete ||
-		    netif_is_bond_master(slave->dev)) {
-			slave_warn(bond_dev, slave->dev,
+		if (!real_dev->xfrmdev_ops ||
+		    !real_dev->xfrmdev_ops->xdo_dev_state_delete ||
+		    netif_is_bond_master(real_dev)) {
+			slave_warn(bond_dev, real_dev,
 				   "%s: no slave xdo_dev_state_delete\n",
 				   __func__);
 		} else {
-			slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs);
-			if (slave->dev->xfrmdev_ops->xdo_dev_state_free)
-				slave->dev->xfrmdev_ops->xdo_dev_state_free(ipsec->xs);
+			real_dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs);
+			if (real_dev->xfrmdev_ops->xdo_dev_state_free)
+				real_dev->xfrmdev_ops->xdo_dev_state_free(ipsec->xs);
 		}
 	}
 	spin_unlock_bh(&bond->ipsec_lock);