net: dsa: use dsa_tree_for_each_cpu_port in dsa_tree_{setup,teardown}_master

More logic will be added to dsa_tree_setup_master() and
dsa_tree_teardown_master() in upcoming changes.

Reduce the indentation by one level in these functions by introducing
and using a dedicated iterator for CPU ports of a tree.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

include/net/dsa.h

@@ -559,6 +559,10 @@ static inline bool dsa_is_user_port(struct dsa_switch *ds, int p)
 	list_for_each_entry((_dp), &(_dst)->ports, list) \
 		if (dsa_port_is_user((_dp)))
 
+#define dsa_tree_for_each_cpu_port(_dp, _dst) \
+	list_for_each_entry((_dp), &(_dst)->ports, list) \
+		if (dsa_port_is_cpu((_dp)))
+
 #define dsa_switch_for_each_port(_dp, _ds) \
 	list_for_each_entry((_dp), &(_ds)->dst->ports, list) \
 		if ((_dp)->ds == (_ds))

net/dsa/dsa2.c

@@ -1060,18 +1060,17 @@ static int dsa_tree_setup_switches(struct dsa_switch_tree *dst)
 
 static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
 {
-	struct dsa_port *dp;
+	struct dsa_port *cpu_dp;
 	int err = 0;
 
 	rtnl_lock();
 
-	list_for_each_entry(dp, &dst->ports, list) {
-		if (dsa_port_is_cpu(dp)) {
-			struct net_device *master = dp->master;
+	dsa_tree_for_each_cpu_port(cpu_dp, dst) {
+		struct net_device *master = cpu_dp->master;
 		bool admin_up = (master->flags & IFF_UP) &&
 				!qdisc_tx_is_noop(master);
 
-			err = dsa_master_setup(master, dp);
+		err = dsa_master_setup(master, cpu_dp);
 		if (err)
 			break;
 
@@ -1080,7 +1079,6 @@ static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
 		dsa_tree_master_oper_state_change(dst, master,
 						  netif_oper_up(master));
 	}
-	}
 
 	rtnl_unlock();
 
@@ -1089,13 +1087,12 @@ static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
 
 static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
 {
-	struct dsa_port *dp;
+	struct dsa_port *cpu_dp;
 
 	rtnl_lock();
 
-	list_for_each_entry(dp, &dst->ports, list) {
-		if (dsa_port_is_cpu(dp)) {
-			struct net_device *master = dp->master;
+	dsa_tree_for_each_cpu_port(cpu_dp, dst) {
+		struct net_device *master = cpu_dp->master;
 
 		/* Synthesizing an "admin down" state is sufficient for
 		 * the switches to get a notification if the master is
@@ -1105,7 +1102,6 @@ static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
 
 		dsa_master_teardown(master);
 	}
-	}
 
 	rtnl_unlock();
 }