net: dsa: add port STP state helper

Add a void helper to set the STP state of a port, checking first if the
required routine is provided by the driver.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 7 deletions

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 9ecbe787f102..fd78d4c9b197 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -69,6 +69,12 @@ static inline bool dsa_port_is_bridged(struct dsa_slave_priv *p)
         return !!p->bridge_dev;
 }
 
+static void dsa_port_set_stp_state(struct dsa_switch *ds, int port, u8 state)
+{
+        if (ds->ops->port_stp_state_set)
+                ds->ops->port_stp_state_set(ds, port, state);
+}
+
 static int dsa_slave_open(struct net_device *dev)
 {
         struct dsa_slave_priv *p = netdev_priv(dev);
@@ -104,8 +110,7 @@ static int dsa_slave_open(struct net_device *dev)
                         goto clear_promisc;
         }
 
-        if (ds->ops->port_stp_state_set)
-                ds->ops->port_stp_state_set(ds, p->port, stp_state);
+        dsa_port_set_stp_state(ds, p->port, stp_state);
 
         if (p->phy)
                 phy_start(p->phy);
@@ -147,8 +152,7 @@ static int dsa_slave_close(struct net_device *dev)
         if (ds->ops->port_disable)
                 ds->ops->port_disable(ds, p->port, p->phy);
 
-        if (ds->ops->port_stp_state_set)
-                ds->ops->port_stp_state_set(ds, p->port, BR_STATE_DISABLED);
+        dsa_port_set_stp_state(ds, p->port, BR_STATE_DISABLED);
 
         return 0;
 }
@@ -354,7 +358,7 @@ static int dsa_slave_stp_state_set(struct net_device *dev,
         if (switchdev_trans_ph_prepare(trans))
                 return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;
 
-        ds->ops->port_stp_state_set(ds, p->port, attr->u.stp_state);
+        dsa_port_set_stp_state(ds, p->port, attr->u.stp_state);
 
         return 0;
 }
@@ -556,8 +560,7 @@ static void dsa_slave_bridge_port_leave(struct net_device *dev)
         /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
          * so allow it to be in BR_STATE_FORWARDING to be kept functional
          */
-        if (ds->ops->port_stp_state_set)
-                ds->ops->port_stp_state_set(ds, p->port, BR_STATE_FORWARDING);
+        dsa_port_set_stp_state(ds, p->port, BR_STATE_FORWARDING);
 }
 
 static int dsa_slave_port_attr_get(struct net_device *dev,