net: dsa: mv88e6xxx: Add missing mutex's in EEE operations.

The phy_mutex should be held while reading and writing to the phy.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
index 7c4c04b..d9a78c7 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -701,53 +701,54 @@ static int _mv88e6xxx_phy_write_indirect(struct dsa_switch *ds, int addr,
 
 int mv88e6xxx_get_eee(struct dsa_switch *ds, int port, struct ethtool_eee *e)
 {
+       struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
        int reg;
 
-       reg = mv88e6xxx_phy_read_indirect(ds, port, 16);
+       mutex_lock(&ps->phy_mutex);
+
+       reg = _mv88e6xxx_phy_read_indirect(ds, port, 16);
        if (reg < 0)
-               return -EOPNOTSUPP;
+               goto out;
 
        e->eee_enabled = !!(reg & 0x0200);
        e->tx_lpi_enabled = !!(reg & 0x0100);
 
-       reg = REG_READ(REG_PORT(port), 0);
-       e->eee_active = !!(reg & 0x0040);
-
-       return 0;
-}
-
-static int mv88e6xxx_eee_enable_set(struct dsa_switch *ds, int port,
-                                   bool eee_enabled, bool tx_lpi_enabled)
-{
-       int reg, nreg;
-
-       reg = _mv88e6xxx_phy_read_indirect(ds, port, 16);
+       reg = mv88e6xxx_reg_read(ds, REG_PORT(port), 0);
        if (reg < 0)
-               return reg;
-
-       nreg = reg & ~0x0300;
-       if (eee_enabled)
-               nreg |= 0x0200;
-       if (tx_lpi_enabled)
-               nreg |= 0x0100;
+               goto out;
 
-       if (nreg != reg)
-               return _mv88e6xxx_phy_write_indirect(ds, port, 16, nreg);
+       e->eee_active = !!(reg & 0x0040);
+       reg = 0;
 
-       return 0;
+out:
+       mutex_unlock(&ps->phy_mutex);
+       return reg;
 }
 
 int mv88e6xxx_set_eee(struct dsa_switch *ds, int port,
                      struct phy_device *phydev, struct ethtool_eee *e)
 {
+       struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+       int reg;
        int ret;
 
-       ret = mv88e6xxx_eee_enable_set(ds, port, e->eee_enabled,
-                                      e->tx_lpi_enabled);
-       if (ret)
-               return -EOPNOTSUPP;
+       mutex_lock(&ps->phy_mutex);
 
-       return 0;
+       ret = _mv88e6xxx_phy_read_indirect(ds, port, 16);
+       if (ret < 0)
+               goto out;
+
+       reg = ret & ~0x0300;
+       if (e->eee_enabled)
+               reg |= 0x0200;
+       if (e->tx_lpi_enabled)
+               reg |= 0x0100;
+
+       ret = _mv88e6xxx_phy_write_indirect(ds, port, 16, reg);
+out:
+       mutex_unlock(&ps->phy_mutex);
+
+       return ret;
 }
 
 static int _mv88e6xxx_atu_cmd(struct dsa_switch *ds, int fid, u16 cmd)