phy: fix EEE checks inside the phy_init_eee.

According to the Std 802.3az if the EEE Adv (Reg 7.60), Link partner ability
(Reg 7.61) and EEE capability (Register 3.20) bits return 0 this  means no EEE
is supported. So this patch fixes the checks inside the phy_init_eee function.

Signed-off-by: Nandini Sharma <nandini.sharma@st.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index c94e2a2..a854d38 100644 (file)
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -1036,31 +1036,31 @@ int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
                /* First check if the EEE ability is supported */
                eee_cap = phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_ABLE,
                                                MDIO_MMD_PCS, phydev->addr);
-               if (eee_cap < 0)
-                       return eee_cap;
+               if (eee_cap <= 0)
+                       goto eee_exit_err;
 
                cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
                if (!cap)
-                       return -EPROTONOSUPPORT;
+                       goto eee_exit_err;
 
                /* Check which link settings negotiated and verify it in
                 * the EEE advertising registers.
                 */
                eee_lp = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_LPABLE,
                                               MDIO_MMD_AN, phydev->addr);
-               if (eee_lp < 0)
-                       return eee_lp;
+               if (eee_lp <= 0)
+                       goto eee_exit_err;
 
                eee_adv = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
                                                MDIO_MMD_AN, phydev->addr);
-               if (eee_adv < 0)
-                       return eee_adv;
+               if (eee_adv <= 0)
+                       goto eee_exit_err;
 
                adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv);
                lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp);
                idx = phy_find_setting(phydev->speed, phydev->duplex);
                if (!(lp & adv & settings[idx].setting))
-                       return -EPROTONOSUPPORT;
+                       goto eee_exit_err;
 
                if (clk_stop_enable) {
                        /* Configure the PHY to stop receiving xMII
@@ -1080,7 +1080,7 @@ int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
 
                return 0; /* EEE supported */
        }
-
+eee_exit_err:
        return -EPROTONOSUPPORT;
 }
 EXPORT_SYMBOL(phy_init_eee);