[PATCH] sky2: handle out of memory on admin changes

Don't die if we run out of memory on mtu or ring parameter change.
For other admin operations, don't rebuild Rx ring, just restart the PHY.
Signed-off-by: NStephen Hemminger <shemminger@osdl.org>
Signed-off-by: NJeff Garzik <jgarzik@pobox.com>

drivers/net/sky2.c

@@ -481,6 +481,14 @@ static void sky2_phy_init(struct sky2_hw *hw, unsigned port)
 		gm_phy_write(hw, port, PHY_MARV_INT_MASK, PHY_M_DEF_MSK);
 }
 
+/* Force a renegotiation */
+static void sky2_phy_reinit(struct sky2_port *sky2)
+{
+	down(&sky2->phy_sema);
+	sky2_phy_init(sky2->hw, sky2->port);
+	up(&sky2->phy_sema);
+}
+
 static void sky2_mac_init(struct sky2_hw *hw, unsigned port)
 {
 	struct sky2_port *sky2 = netdev_priv(hw->dev[port]);
@@ -1014,18 +1022,22 @@ static int sky2_up(struct net_device *dev)
 	return 0;
 
 err_out:
-	if (sky2->rx_le)
+	if (sky2->rx_le) {
 		pci_free_consistent(hw->pdev, RX_LE_BYTES,
 				    sky2->rx_le, sky2->rx_le_map);
-	if (sky2->tx_le)
+		sky2->rx_le = NULL;
+	}
+	if (sky2->tx_le) {
 		pci_free_consistent(hw->pdev,
 				    TX_RING_SIZE * sizeof(struct sky2_tx_le),
 				    sky2->tx_le, sky2->tx_le_map);
-	if (sky2->tx_ring)
-		kfree(sky2->tx_ring);
-	if (sky2->rx_ring)
-		kfree(sky2->rx_ring);
+		sky2->tx_le = NULL;
+	}
+	kfree(sky2->tx_ring);
+	kfree(sky2->rx_ring);
 
+	sky2->tx_ring = NULL;
+	sky2->rx_ring = NULL;
 	return err;
 }
 
@@ -1291,6 +1303,10 @@ static int sky2_down(struct net_device *dev)
 	unsigned port = sky2->port;
 	u16 ctrl;
 
+	/* Never really got started! */
+	if (!sky2->tx_le)
+		return 0;
+
 	if (netif_msg_ifdown(sky2))
 		printk(KERN_INFO PFX "%s: disabling interface\n", dev->name);
 
@@ -1365,6 +1381,12 @@ static int sky2_down(struct net_device *dev)
 			    sky2->tx_le, sky2->tx_le_map);
 	kfree(sky2->tx_ring);
 
+	sky2->tx_le = NULL;
+	sky2->rx_le = NULL;
+
+	sky2->rx_ring = NULL;
+	sky2->tx_ring = NULL;
+
 	return 0;
 }
 
@@ -1636,12 +1658,17 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu)
 	sky2_write8(hw, RB_ADDR(rxqaddr[sky2->port], RB_CTRL), RB_ENA_OP_MD);
 
 	err = sky2_rx_start(sky2);
-	gma_write16(hw, sky2->port, GM_GP_CTRL, ctl);
-
-	netif_poll_disable(hw->dev[0]);
-	netif_wake_queue(dev);
 	sky2_write32(hw, B0_IMSK, hw->intr_mask);
 
+	if (err)
+		dev_close(dev);
+	else {
+		gma_write16(hw, sky2->port, GM_GP_CTRL, ctl);
+
+		netif_poll_enable(hw->dev[0]);
+		netif_wake_queue(dev);
+	}
+
 	return err;
 }
 
@@ -2315,10 +2342,8 @@ static int sky2_set_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
 	sky2->autoneg = ecmd->autoneg;
 	sky2->advertising = ecmd->advertising;
 
-	if (netif_running(dev)) {
-		sky2_down(dev);
-		sky2_up(dev);
-	}
+	if (netif_running(dev))
+		sky2_phy_reinit(sky2);
 
 	return 0;
 }
@@ -2389,17 +2414,11 @@ static u32 sky2_get_msglevel(struct net_device *netdev)
 static int sky2_nway_reset(struct net_device *dev)
 {
 	struct sky2_port *sky2 = netdev_priv(dev);
-	struct sky2_hw *hw = sky2->hw;
 
 	if (sky2->autoneg != AUTONEG_ENABLE)
 		return -EINVAL;
 
-	netif_stop_queue(dev);
-
-	down(&sky2->phy_sema);
-	sky2_phy_reset(hw, sky2->port);
-	sky2_phy_init(hw, sky2->port);
-	up(&sky2->phy_sema);
+	sky2_phy_reinit(sky2);
 
 	return 0;
 }
@@ -2477,20 +2496,20 @@ static int sky2_set_mac_address(struct net_device *dev, void *p)
 {
 	struct sky2_port *sky2 = netdev_priv(dev);
 	struct sockaddr *addr = p;
-	int err = 0;
 
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
 
-	sky2_down(dev);
 	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 	memcpy_toio(sky2->hw->regs + B2_MAC_1 + sky2->port * 8,
 		    dev->dev_addr, ETH_ALEN);
 	memcpy_toio(sky2->hw->regs + B2_MAC_2 + sky2->port * 8,
 		    dev->dev_addr, ETH_ALEN);
-	if (dev->flags & IFF_UP)
-		err = sky2_up(dev);
-	return err;
+
+	if (netif_running(dev))
+		sky2_phy_reinit(sky2);
+
+	return 0;
 }
 
 static void sky2_set_multicast(struct net_device *dev)
@@ -2648,10 +2667,7 @@ static int sky2_set_pauseparam(struct net_device *dev,
 	sky2->tx_pause = ecmd->tx_pause != 0;
 	sky2->rx_pause = ecmd->rx_pause != 0;
 
-	if (netif_running(dev)) {
-		sky2_down(dev);
-		err = sky2_up(dev);
-	}
+	sky2_phy_reinit(sky2);
 
 	return err;
 }
@@ -2813,8 +2829,11 @@ static int sky2_set_ringparam(struct net_device *dev,
 	sky2->rx_pending = ering->rx_pending;
 	sky2->tx_pending = ering->tx_pending;
 
-	if (netif_running(dev))
+	if (netif_running(dev)) {
 		err = sky2_up(dev);
+		if (err)
+			dev_close(dev);
+	}
 
 	return err;
 }
@@ -3195,7 +3214,8 @@ static int sky2_resume(struct pci_dev *pdev)
 		if (dev) {
 			if (netif_running(dev)) {
 				netif_device_attach(dev);
-				sky2_up(dev);
+				if (sky2_up(dev))
+					dev_close(dev);
 			}
 		}
 	}