diff --git a/drivers/net/e100.c b/drivers/net/e100.c
index b0aa9e6..66ba596 100644
--- a/drivers/net/e100.c
+++ b/drivers/net/e100.c
@@ -1668,7 +1668,7 @@
 static void e100_watchdog(unsigned long data)
 {
 	struct nic *nic = (struct nic *)data;
-	struct ethtool_cmd cmd;
+	struct ethtool_cmd cmd = { .cmd = ETHTOOL_GSET };
 
 	netif_printk(nic, timer, KERN_DEBUG, nic->netdev,
 		     "right now = %ld\n", jiffies);
diff --git a/drivers/net/mdio.c b/drivers/net/mdio.c
index e85bf04..f2d10ab 100644
--- a/drivers/net/mdio.c
+++ b/drivers/net/mdio.c
@@ -176,6 +176,9 @@
  * @npage_adv: Modes currently advertised on next pages
  * @npage_lpa: Modes advertised by link partner on next pages
  *
+ * The @ecmd parameter is expected to have been cleared before calling
+ * mdio45_ethtool_gset_npage().
+ *
  * Since the CSRs for auto-negotiation using next pages are not fully
  * standardised, this function does not attempt to decode them.  The
  * caller must pass them in.
diff --git a/drivers/net/mii.c b/drivers/net/mii.c
index 0a6c6a2..05acca7 100644
--- a/drivers/net/mii.c
+++ b/drivers/net/mii.c
@@ -58,6 +58,9 @@
  * @mii: MII interface
  * @ecmd: requested ethtool_cmd
  *
+ * The @ecmd parameter is expected to have been cleared before calling
+ * mii_ethtool_gset().
+ *
  * Returns 0 for success, negative on error.
  */
 int mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd)
diff --git a/drivers/net/pch_gbe/pch_gbe_main.c b/drivers/net/pch_gbe/pch_gbe_main.c
index 4cc9872..f3e4b0a 100644
--- a/drivers/net/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/pch_gbe/pch_gbe_main.c
@@ -888,12 +888,12 @@
 	struct pch_gbe_adapter *adapter = (struct pch_gbe_adapter *)data;
 	struct net_device *netdev = adapter->netdev;
 	struct pch_gbe_hw *hw = &adapter->hw;
-	struct ethtool_cmd cmd;
 
 	pr_debug("right now = %ld\n", jiffies);
 
 	pch_gbe_update_stats(adapter);
 	if ((mii_link_ok(&adapter->mii)) && (!netif_carrier_ok(netdev))) {
+		struct ethtool_cmd cmd = { .cmd = ETHTOOL_GSET };
 		netdev->tx_queue_len = adapter->tx_queue_len;
 		/* mii library handles link maintenance tasks */
 		if (mii_ethtool_gset(&adapter->mii, &cmd)) {
@@ -903,7 +903,7 @@
 						PCH_GBE_WATCHDOG_PERIOD));
 			return;
 		}
-		hw->mac.link_speed = cmd.speed;
+		hw->mac.link_speed = ethtool_cmd_speed(&cmd);
 		hw->mac.link_duplex = cmd.duplex;
 		/* Set the RGMII control. */
 		pch_gbe_set_rgmii_ctrl(adapter, hw->mac.link_speed,
@@ -913,7 +913,7 @@
 				 hw->mac.link_duplex);
 		netdev_dbg(netdev,
 			   "Link is Up %d Mbps %s-Duplex\n",
-			   cmd.speed,
+			   hw->mac.link_speed,
 			   cmd.duplex == DUPLEX_FULL ? "Full" : "Half");
 		netif_carrier_on(netdev);
 		netif_wake_queue(netdev);
diff --git a/drivers/net/pch_gbe/pch_gbe_phy.c b/drivers/net/pch_gbe/pch_gbe_phy.c
index 923a687..9a8207f 100644
--- a/drivers/net/pch_gbe/pch_gbe_phy.c
+++ b/drivers/net/pch_gbe/pch_gbe_phy.c
@@ -247,7 +247,7 @@
 void pch_gbe_phy_init_setting(struct pch_gbe_hw *hw)
 {
 	struct pch_gbe_adapter *adapter;
-	struct ethtool_cmd     cmd;
+	struct ethtool_cmd     cmd = { .cmd = ETHTOOL_GSET };
 	int ret;
 	u16 mii_reg;
 
diff --git a/drivers/net/pcnet32.c b/drivers/net/pcnet32.c
index 0a1efba..b48aba9 100644
--- a/drivers/net/pcnet32.c
+++ b/drivers/net/pcnet32.c
@@ -2099,7 +2099,7 @@
 		int first_phy = -1;
 		u16 bmcr;
 		u32 bcr9;
-		struct ethtool_cmd ecmd;
+		struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 
 		/*
 		 * There is really no good other way to handle multiple PHYs
@@ -2115,9 +2115,9 @@
 			ecmd.port = PORT_MII;
 			ecmd.transceiver = XCVR_INTERNAL;
 			ecmd.autoneg = AUTONEG_DISABLE;
-			ecmd.speed =
-			    lp->
-			    options & PCNET32_PORT_100 ? SPEED_100 : SPEED_10;
+			ethtool_cmd_speed_set(&ecmd,
+					      (lp->options & PCNET32_PORT_100) ?
+					      SPEED_100 : SPEED_10);
 			bcr9 = lp->a.read_bcr(ioaddr, 9);
 
 			if (lp->options & PCNET32_PORT_FD) {
@@ -2763,11 +2763,11 @@
 		netif_carrier_on(dev);
 		if (lp->mii) {
 			if (netif_msg_link(lp)) {
-				struct ethtool_cmd ecmd;
+				struct ethtool_cmd ecmd = {
+					.cmd = ETHTOOL_GSET };
 				mii_ethtool_gset(&lp->mii_if, &ecmd);
-				netdev_info(dev, "link up, %sMbps, %s-duplex\n",
-					    (ecmd.speed == SPEED_100)
-					    ? "100" : "10",
+				netdev_info(dev, "link up, %uMbps, %s-duplex\n",
+					    ethtool_cmd_speed(&ecmd),
 					    (ecmd.duplex == DUPLEX_FULL)
 					    ? "full" : "half");
 			}
diff --git a/drivers/net/sfc/mdio_10g.c b/drivers/net/sfc/mdio_10g.c
index 19e68c2..7115914 100644
--- a/drivers/net/sfc/mdio_10g.c
+++ b/drivers/net/sfc/mdio_10g.c
@@ -232,12 +232,12 @@
  */
 int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
 {
-	struct ethtool_cmd prev;
+	struct ethtool_cmd prev = { .cmd = ETHTOOL_GSET };
 
 	efx->phy_op->get_settings(efx, &prev);
 
 	if (ecmd->advertising == prev.advertising &&
-	    ecmd->speed == prev.speed &&
+	    ethtool_cmd_speed(ecmd) == ethtool_cmd_speed(&prev) &&
 	    ecmd->duplex == prev.duplex &&
 	    ecmd->port == prev.port &&
 	    ecmd->autoneg == prev.autoneg)
diff --git a/drivers/net/stmmac/stmmac_ethtool.c b/drivers/net/stmmac/stmmac_ethtool.c
index 0e61ac8..6f5aaeb 100644
--- a/drivers/net/stmmac/stmmac_ethtool.c
+++ b/drivers/net/stmmac/stmmac_ethtool.c
@@ -237,13 +237,12 @@
 
 	if (phy->autoneg) {
 		if (netif_running(netdev)) {
-			struct ethtool_cmd cmd;
+			struct ethtool_cmd cmd = { .cmd = ETHTOOL_SSET };
 			/* auto-negotiation automatically restarted */
-			cmd.cmd = ETHTOOL_NWAY_RST;
 			cmd.supported = phy->supported;
 			cmd.advertising = phy->advertising;
 			cmd.autoneg = phy->autoneg;
-			cmd.speed = phy->speed;
+			ethtool_cmd_speed_set(&cmd, phy->speed);
 			cmd.duplex = phy->duplex;
 			cmd.phy_address = phy->addr;
 			ret = phy_ethtool_sset(phy, &cmd);
diff --git a/drivers/net/usb/asix.c b/drivers/net/usb/asix.c
index 6140b56..6998aa6 100644
--- a/drivers/net/usb/asix.c
+++ b/drivers/net/usb/asix.c
@@ -847,7 +847,7 @@
 static int ax88172_link_reset(struct usbnet *dev)
 {
 	u8 mode;
-	struct ethtool_cmd ecmd;
+	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 
 	mii_check_media(&dev->mii, 1, 1);
 	mii_ethtool_gset(&dev->mii, &ecmd);
@@ -856,8 +856,8 @@
 	if (ecmd.duplex != DUPLEX_FULL)
 		mode |= ~AX88172_MEDIUM_FD;
 
-	netdev_dbg(dev->net, "ax88172_link_reset() speed: %d duplex: %d setting mode to 0x%04x\n",
-		   ecmd.speed, ecmd.duplex, mode);
+	netdev_dbg(dev->net, "ax88172_link_reset() speed: %u duplex: %d setting mode to 0x%04x\n",
+		   ethtool_cmd_speed(&ecmd), ecmd.duplex, mode);
 
 	asix_write_medium_mode(dev, mode);
 
@@ -947,20 +947,20 @@
 static int ax88772_link_reset(struct usbnet *dev)
 {
 	u16 mode;
-	struct ethtool_cmd ecmd;
+	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 
 	mii_check_media(&dev->mii, 1, 1);
 	mii_ethtool_gset(&dev->mii, &ecmd);
 	mode = AX88772_MEDIUM_DEFAULT;
 
-	if (ecmd.speed != SPEED_100)
+	if (ethtool_cmd_speed(&ecmd) != SPEED_100)
 		mode &= ~AX_MEDIUM_PS;
 
 	if (ecmd.duplex != DUPLEX_FULL)
 		mode &= ~AX_MEDIUM_FD;
 
-	netdev_dbg(dev->net, "ax88772_link_reset() speed: %d duplex: %d setting mode to 0x%04x\n",
-		   ecmd.speed, ecmd.duplex, mode);
+	netdev_dbg(dev->net, "ax88772_link_reset() speed: %u duplex: %d setting mode to 0x%04x\n",
+		   ethtool_cmd_speed(&ecmd), ecmd.duplex, mode);
 
 	asix_write_medium_mode(dev, mode);
 
@@ -1173,18 +1173,20 @@
 static int ax88178_link_reset(struct usbnet *dev)
 {
 	u16 mode;
-	struct ethtool_cmd ecmd;
+	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 	struct asix_data *data = (struct asix_data *)&dev->data;
+	u32 speed;
 
 	netdev_dbg(dev->net, "ax88178_link_reset()\n");
 
 	mii_check_media(&dev->mii, 1, 1);
 	mii_ethtool_gset(&dev->mii, &ecmd);
 	mode = AX88178_MEDIUM_DEFAULT;
+	speed = ethtool_cmd_speed(&ecmd);
 
-	if (ecmd.speed == SPEED_1000)
+	if (speed == SPEED_1000)
 		mode |= AX_MEDIUM_GM;
-	else if (ecmd.speed == SPEED_100)
+	else if (speed == SPEED_100)
 		mode |= AX_MEDIUM_PS;
 	else
 		mode &= ~(AX_MEDIUM_PS | AX_MEDIUM_GM);
@@ -1196,13 +1198,13 @@
 	else
 		mode &= ~AX_MEDIUM_FD;
 
-	netdev_dbg(dev->net, "ax88178_link_reset() speed: %d duplex: %d setting mode to 0x%04x\n",
-		   ecmd.speed, ecmd.duplex, mode);
+	netdev_dbg(dev->net, "ax88178_link_reset() speed: %u duplex: %d setting mode to 0x%04x\n",
+		   speed, ecmd.duplex, mode);
 
 	asix_write_medium_mode(dev, mode);
 
 	if (data->phymode == PHY_MODE_MARVELL && data->ledmode)
-		marvell_led_status(dev, ecmd.speed);
+		marvell_led_status(dev, speed);
 
 	return 0;
 }
diff --git a/drivers/net/usb/dm9601.c b/drivers/net/usb/dm9601.c
index 5002f5b..1d93133 100644
--- a/drivers/net/usb/dm9601.c
+++ b/drivers/net/usb/dm9601.c
@@ -599,13 +599,13 @@
 
 static int dm9601_link_reset(struct usbnet *dev)
 {
-	struct ethtool_cmd ecmd;
+	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 
 	mii_check_media(&dev->mii, 1, 1);
 	mii_ethtool_gset(&dev->mii, &ecmd);
 
-	netdev_dbg(dev->net, "link_reset() speed: %d duplex: %d\n",
-		   ecmd.speed, ecmd.duplex);
+	netdev_dbg(dev->net, "link_reset() speed: %u duplex: %d\n",
+		   ethtool_cmd_speed(&ecmd), ecmd.duplex);
 
 	return 0;
 }
diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index 860a20c..15b3d68 100644
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -503,7 +503,7 @@
 static int smsc75xx_link_reset(struct usbnet *dev)
 {
 	struct mii_if_info *mii = &dev->mii;
-	struct ethtool_cmd ecmd;
+	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 	u16 lcladv, rmtadv;
 	int ret;
 
@@ -519,8 +519,9 @@
 	lcladv = smsc75xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
 	rmtadv = smsc75xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
 
-	netif_dbg(dev, link, dev->net, "speed: %d duplex: %d lcladv: %04x"
-		" rmtadv: %04x", ecmd.speed, ecmd.duplex, lcladv, rmtadv);
+	netif_dbg(dev, link, dev->net, "speed: %u duplex: %d lcladv: %04x"
+		  " rmtadv: %04x", ethtool_cmd_speed(&ecmd),
+		  ecmd.duplex, lcladv, rmtadv);
 
 	return smsc75xx_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
 }
diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index 24f4b37..b374a99 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -457,7 +457,7 @@
 {
 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 	struct mii_if_info *mii = &dev->mii;
-	struct ethtool_cmd ecmd;
+	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 	unsigned long flags;
 	u16 lcladv, rmtadv;
 	u32 intdata;
@@ -472,8 +472,9 @@
 	lcladv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
 	rmtadv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
 
-	netif_dbg(dev, link, dev->net, "speed: %d duplex: %d lcladv: %04x rmtadv: %04x\n",
-		  ecmd.speed, ecmd.duplex, lcladv, rmtadv);
+	netif_dbg(dev, link, dev->net,
+		  "speed: %u duplex: %d lcladv: %04x rmtadv: %04x\n",
+		  ethtool_cmd_speed(&ecmd), ecmd.duplex, lcladv, rmtadv);
 
 	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 	if (ecmd.duplex != DUPLEX_FULL) {