net: phy: fix write to mii-ctrl1000 register

When userspace writes to the MII_ADVERTISE register, we update phylib's
advertising mask and trigger a renegotiation.  However, writing to the
MII_CTRL1000 register, which contains the gigabit advertisement, does
neither.  This can lead to phylib's copy of the advertisement becoming
de-synced with the values in the PHY register set, which can result in
incorrect negotiation resolution.

Fixes: 5502b218e001 ("net: phy: use phy_resolve_aneg_linkmode in genphy_read_status")
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 7c92afd..119e6f4 100644 (file)
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -457,6 +457,11 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
                                                           val);
                                change_autoneg = true;
                                break;
+                       case MII_CTRL1000:
+                               mii_ctrl1000_mod_linkmode_adv_t(phydev->advertising,
+                                                               val);
+                               change_autoneg = true;
+                               break;
                        default:
                                /* do nothing */
                                break;

diff --git a/include/linux/mii.h b/include/linux/mii.h
index 5cd824c..4ce8901 100644 (file)
--- a/include/linux/mii.h
+++ b/include/linux/mii.h
@@ -455,6 +455,15 @@ static inline void mii_lpa_mod_linkmode_lpa_t(unsigned long *lp_advertising,
                         lp_advertising, lpa & LPA_LPACK);
 }
 
+static inline void mii_ctrl1000_mod_linkmode_adv_t(unsigned long *advertising,
+                                                  u32 ctrl1000)
+{
+       linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, advertising,
+                        ctrl1000 & ADVERTISE_1000HALF);
+       linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, advertising,
+                        ctrl1000 & ADVERTISE_1000FULL);
+}
+
 /**
  * linkmode_adv_to_lcl_adv_t
  * @advertising:pointer to linkmode advertising