net: dsa: do not enable or disable non user ports

The .port_enable and .port_disable operations are currently only
called for user ports, hence assuming they have a slave device. In
preparation for using these operations for other port types as well,
simply guard all implementations against non user ports and return
directly in such case.

Note that bcm_sf2_sw_suspend() currently calls bcm_sf2_port_disable()
(and thus b53_disable_port()) against the user and CPU ports, so do
not guards those functions. They will be called for unused ports in
the future, but that was expected by those drivers anyway.

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

7 files changed, 39 insertions, 1 deletions

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 907af62846ba..7d328a5f0161 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -510,10 +510,15 @@ EXPORT_SYMBOL(b53_imp_vlan_setup);
 int b53_enable_port(struct dsa_switch *ds, int port, struct phy_device *phy)
 {
         struct b53_device *dev = ds->priv;
-        unsigned int cpu_port = ds->ports[port].cpu_dp->index;
+        unsigned int cpu_port;
         int ret = 0;
         u16 pvlan;
 
+        if (!dsa_is_user_port(ds, port))
+                return 0;
+
+        cpu_port = ds->ports[port].cpu_dp->index;
+
         if (dev->ops->irq_enable)
                 ret = dev->ops->irq_enable(dev, port);
         if (ret)
diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 49f99436018a..4f839348011d 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -157,6 +157,9 @@ static int bcm_sf2_port_setup(struct dsa_switch *ds, int port,
         unsigned int i;
         u32 reg;
 
+        if (!dsa_is_user_port(ds, port))
+                return 0;
+
         /* Clear the memory power down */
         reg = core_readl(priv, CORE_MEM_PSM_VDD_CTRL);
         reg &= ~P_TXQ_PSM_VDD(port);
diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index 7a2063e7737a..bbec86b9418e 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -1079,6 +1079,9 @@ static int lan9303_port_enable(struct dsa_switch *ds, int port,
 {
         struct lan9303 *chip = ds->priv;
 
+        if (!dsa_is_user_port(ds, port))
+                return 0;
+
         return lan9303_enable_processing_port(chip, port);
 }
 
@@ -1086,6 +1089,9 @@ static void lan9303_port_disable(struct dsa_switch *ds, int port)
 {
         struct lan9303 *chip = ds->priv;
 
+        if (!dsa_is_user_port(ds, port))
+                return;
+
         lan9303_disable_processing_port(chip, port);
         lan9303_phy_write(ds, chip->phy_addr_base + port, MII_BMCR, BMCR_PDOWN);
 }
diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index 2175ec13bb2c..a69c9b9878b7 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -642,6 +642,9 @@ static int gswip_port_enable(struct dsa_switch *ds, int port,
         struct gswip_priv *priv = ds->priv;
         int err;
 
+        if (!dsa_is_user_port(ds, port))
+                return 0;
+
         if (!dsa_is_cpu_port(ds, port)) {
                 err = gswip_add_single_port_br(priv, port, true);
                 if (err)
@@ -678,6 +681,9 @@ static void gswip_port_disable(struct dsa_switch *ds, int port)
 {
         struct gswip_priv *priv = ds->priv;
 
+        if (!dsa_is_user_port(ds, port))
+                return;
+
         if (!dsa_is_cpu_port(ds, port)) {
                 gswip_mdio_mask(priv, GSWIP_MDIO_PHY_LINK_DOWN,
                                 GSWIP_MDIO_PHY_LINK_MASK,
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index b45c7b972cec..b0b870f0c252 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -361,6 +361,9 @@ int ksz_enable_port(struct dsa_switch *ds, int port, struct phy_device *phy)
 {
         struct ksz_device *dev = ds->priv;
 
+        if (!dsa_is_user_port(ds, port))
+                return 0;
+
         /* setup slave port */
         dev->dev_ops->port_setup(dev, port, false);
         if (dev->dev_ops->phy_setup)
@@ -378,6 +381,9 @@ void ksz_disable_port(struct dsa_switch *ds, int port)
 {
         struct ksz_device *dev = ds->priv;
 
+        if (!dsa_is_user_port(ds, port))
+                return;
+
         dev->on_ports &= ~(1 << port);
         dev->live_ports &= ~(1 << port);
 
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 3181e95586d6..c48e29486b10 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -726,6 +726,9 @@ mt7530_port_enable(struct dsa_switch *ds, int port,
 {
         struct mt7530_priv *priv = ds->priv;
 
+        if (!dsa_is_user_port(ds, port))
+                return 0;
+
         mutex_lock(&priv->reg_mutex);
 
         /* Setup the MAC for the user port */
@@ -751,6 +754,9 @@ mt7530_port_disable(struct dsa_switch *ds, int port)
 {
         struct mt7530_priv *priv = ds->priv;
 
+        if (!dsa_is_user_port(ds, port))
+                return;
+
         mutex_lock(&priv->reg_mutex);
 
         /* Clear up all port matrix which could be restored in the next
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 9b3ad22a5b98..5e557545df6d 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -2267,6 +2267,9 @@ static int mv88e6xxx_port_enable(struct dsa_switch *ds, int port,
         struct mv88e6xxx_chip *chip = ds->priv;
         int err;
 
+        if (!dsa_is_user_port(ds, port))
+                return 0;
+
         mv88e6xxx_reg_lock(chip);
 
         err = mv88e6xxx_serdes_power(chip, port, true);
@@ -2283,6 +2286,9 @@ static void mv88e6xxx_port_disable(struct dsa_switch *ds, int port)
 {
         struct mv88e6xxx_chip *chip = ds->priv;
 
+        if (!dsa_is_user_port(ds, port))
+                return;
+
         mv88e6xxx_reg_lock(chip);
 
         if (mv88e6xxx_port_set_state(chip, port, BR_STATE_DISABLED))