From: Andy Gospodarek <gospo@redhat.com>
Date: Tue, 5 Feb 2008 15:53:37 -0500
Subject: [net] bonding: locking fixes and version 3.2.4
Message-id: 20080205205337.GD28559@gospo.usersys.redhat.com
O-Subject: [RHEL5.2 PATCH] bonding: upstream locking fixes and update to version 3.2.4
Bugzilla: 268001

These changes are a few that were committed to 2.6.24 and a few that are
in Jeff's netdev-2.6 tree after 2.6.24 was released.  The conversion to
workqueues went pretty well, but there were a few problems still lurking
out there that were discovered.

This update will resolve those issues and move bonding forward to
version 3.2.4.  The difference between this and what is upstream is now
quite small, with the only major difference being that RHEL5.2 currently
doesn't support bonding and IPoIB.  (That may hit later, but it's not
tested/approved yet.)

This has been tested by several customers and partners and resolves
their issues.

This patch resolves BZ 268001 and in the process of updating to the
latest also fixes BZ 430580.

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 09a8a89..41f7b92 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -976,7 +976,7 @@ static void alb_swap_mac_addr(struct bonding *bond, struct slave *slave1, struct
 /*
  * Send learning packets after MAC address swap.
  *
- * Called with RTNL and bond->lock held for read.
+ * Called with RTNL and no other locks
  */
 static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
 				struct slave *slave2)
@@ -984,6 +984,8 @@ static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
 	int slaves_state_differ = (SLAVE_IS_OK(slave1) != SLAVE_IS_OK(slave2));
 	struct slave *disabled_slave = NULL;
 
+	ASSERT_RTNL();
+
 	/* fasten the change in the switch */
 	if (SLAVE_IS_OK(slave1)) {
 		alb_send_learning_packets(slave1, slave1->dev->dev_addr);
@@ -1028,7 +1030,7 @@ static void alb_fasten_mac_swap(struct bonding *bond, struct slave *slave1,
  * a slave that has @slave's permanet address as its current address.
  * We'll make sure that that slave no longer uses @slave's permanent address.
  *
- * Caller must hold bond lock
+ * Caller must hold RTNL and no other locks
  */
 static void alb_change_hw_addr_on_detach(struct bonding *bond, struct slave *slave)
 {
@@ -1539,7 +1541,12 @@ int bond_alb_init_slave(struct bonding *bond, struct slave *slave)
 	return 0;
 }
 
-/* Caller must hold bond lock for write */
+/*
+ * Remove slave from tlb and rlb hash tables, and fix up MAC addresses
+ * if necessary.
+ *
+ * Caller must hold RTNL and no other locks
+ */
 void bond_alb_deinit_slave(struct bonding *bond, struct slave *slave)
 {
 	if (bond->slave_cnt > 1) {
@@ -1598,9 +1605,6 @@ void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave
 	struct slave *swap_slave;
 	int i;
 
-	if (new_slave)
-		ASSERT_RTNL();
-
 	if (bond->curr_active_slave == new_slave) {
 		return;
 	}
@@ -1646,6 +1650,8 @@ void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave
 	write_unlock_bh(&bond->curr_slave_lock);
 	read_unlock(&bond->lock);
 
+	ASSERT_RTNL();
+
 	/* curr_active_slave must be set before calling alb_swap_mac_addr */
 	if (swap_slave) {
 		/* swap mac address */
@@ -1656,12 +1662,11 @@ void bond_alb_handle_active_change(struct bonding *bond, struct slave *new_slave
 				       bond->alb_info.rlb_enabled);
 	}
 
-	read_lock(&bond->lock);
-
 	if (swap_slave) {
 		alb_fasten_mac_swap(bond, swap_slave, new_slave);
+		read_lock(&bond->lock);
 	} else {
-		/* fasten bond mac on new current slave */
+		read_lock(&bond->lock);
 		alb_send_learning_packets(new_slave, bond->dev->dev_addr);
 	}
 
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 4e8048e..8fa2ebb 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1464,10 +1464,12 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 			dev_set_allmulti(slave_dev, 1);
 		}
 
+		netif_tx_lock_bh(bond_dev);
 		/* upload master's mc_list to new slave */
 		for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
 			dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 		}
+		netif_tx_unlock_bh(bond_dev);
 	}
 
 	if (bond->params.mode == BOND_MODE_8023AD) {
@@ -1751,7 +1753,9 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
 		 * has been cleared (if our_slave == old_current),
 		 * but before a new active slave is selected.
 		 */
+		write_unlock_bh(&bond->lock);
 		bond_alb_deinit_slave(bond, slave);
+		write_lock_bh(&bond->lock);
 	}
 
 	if (oldcurrent == slave) {
@@ -1824,7 +1828,9 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
 		}
 
 		/* flush master's mc_list from slave */
+		netif_tx_lock_bh(bond_dev);
 		bond_mc_list_flush(bond_dev, slave_dev);
+		netif_tx_unlock_bh(bond_dev);
 	}
 
 	netdev_set_master(slave_dev, NULL);
@@ -1910,6 +1916,12 @@ static int bond_release_all(struct net_device *bond_dev)
 		slave_dev = slave->dev;
 		bond_detach_slave(bond, slave);
 
+		/* now that the slave is detached, unlock and perform
+		 * all the undo steps that should not be called from
+		 * within a lock.
+		 */
+		write_unlock_bh(&bond->lock);
+
 		if ((bond->params.mode == BOND_MODE_TLB) ||
 		    (bond->params.mode == BOND_MODE_ALB)) {
 			/* must be called only after the slave
@@ -1920,12 +1932,6 @@ static int bond_release_all(struct net_device *bond_dev)
 
 		bond_compute_features(bond);
 
-		/* now that the slave is detached, unlock and perform
-		 * all the undo steps that should not be called from
-		 * within a lock.
-		 */
-		write_unlock_bh(&bond->lock);
-
 		bond_destroy_slave_symlinks(bond_dev, slave_dev);
 		bond_del_vlans_from_slave(bond, slave_dev);
 
@@ -1945,7 +1951,9 @@ static int bond_release_all(struct net_device *bond_dev)
 			}
 
 			/* flush master's mc_list from slave */
+			netif_tx_lock_bh(bond_dev);
 			bond_mc_list_flush(bond_dev, slave_dev);
+			netif_tx_unlock_bh(bond_dev);
 		}
 
 		netdev_set_master(slave_dev, NULL);
@@ -2388,7 +2396,9 @@ void bond_mii_monitor(void *work_data)
 		rtnl_lock();
 		read_lock(&bond->lock);
 		__bond_mii_monitor(bond, 1);
-		rtnl_unlock();
+		read_unlock(&bond->lock);
+		rtnl_unlock();	/* might sleep, hold no other locks */
+		read_lock(&bond->lock);
 	}
 
 	delay = ((bond->params.miimon * HZ) / 1000) ? : 1;
@@ -2791,14 +2801,11 @@ void bond_loadbalance_arp_mon(void *work_data)
 	}
 
 	if (do_failover) {
-		rtnl_lock();
 		write_lock_bh(&bond->curr_slave_lock);
 
 		bond_select_active_slave(bond);
 
 		write_unlock_bh(&bond->curr_slave_lock);
-		rtnl_unlock();
-
 	}
 
 re_arm:
@@ -2854,8 +2861,6 @@ void bond_activebackup_arp_mon(void *work_data)
 
 				slave->link = BOND_LINK_UP;
 
-				rtnl_lock();
-
 				write_lock_bh(&bond->curr_slave_lock);
 
 				if ((!bond->curr_active_slave) &&
@@ -2891,7 +2896,6 @@ void bond_activebackup_arp_mon(void *work_data)
 				}
 
 				write_unlock_bh(&bond->curr_slave_lock);
-				rtnl_unlock();
 			}
 		} else {
 			read_lock(&bond->curr_slave_lock);
@@ -2961,7 +2965,6 @@ void bond_activebackup_arp_mon(void *work_data)
 			       bond->dev->name,
 			       slave->dev->name);
 
-			rtnl_lock();
 			write_lock_bh(&bond->curr_slave_lock);
 
 			bond_select_active_slave(bond);
@@ -2969,8 +2972,6 @@ void bond_activebackup_arp_mon(void *work_data)
 
 			write_unlock_bh(&bond->curr_slave_lock);
 
-			rtnl_unlock();
-
 			bond->current_arp_slave = slave;
 
 			if (slave) {
@@ -2988,13 +2989,10 @@ void bond_activebackup_arp_mon(void *work_data)
 			       bond->primary_slave->dev->name);
 
 			/* primary is up so switch to it */
-			rtnl_lock();
 			write_lock_bh(&bond->curr_slave_lock);
 			bond_change_active_slave(bond, bond->primary_slave);
 			write_unlock_bh(&bond->curr_slave_lock);
 
-			rtnl_unlock();
-
 			slave = bond->primary_slave;
 			slave->jiffies = jiffies;
 		} else {
@@ -3403,9 +3401,7 @@ static int bond_master_netdev_event(unsigned long event, struct net_device *bond
 	case NETDEV_CHANGENAME:
 		return bond_event_changename(event_bond);
 	case NETDEV_UNREGISTER:
-		/*
-		 * TODO: remove a bond from the list?
-		 */
+		bond_release_all(event_bond->dev);
 		break;
 	default:
 		break;
@@ -3772,10 +3768,11 @@ static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
 {
 	struct bonding *bond = bond_dev->priv;
 	struct net_device_stats *stats = &(bond->stats), *sstats;
+	struct net_device_stats local_stats;
 	struct slave *slave;
 	int i;
 
-	memset(stats, 0, sizeof(struct net_device_stats));
+	memset(&local_stats, 0, sizeof(struct net_device_stats));
 
 	read_lock_bh(&bond->lock);
 
@@ -3783,34 +3780,36 @@ static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
 		if (slave->dev->get_stats) {
 			sstats = slave->dev->get_stats(slave->dev);
 
-			stats->rx_packets += sstats->rx_packets;
-			stats->rx_bytes += sstats->rx_bytes;
-			stats->rx_errors += sstats->rx_errors;
-			stats->rx_dropped += sstats->rx_dropped;
-
-			stats->tx_packets += sstats->tx_packets;
-			stats->tx_bytes += sstats->tx_bytes;
-			stats->tx_errors += sstats->tx_errors;
-			stats->tx_dropped += sstats->tx_dropped;
-
-			stats->multicast += sstats->multicast;
-			stats->collisions += sstats->collisions;
-
-			stats->rx_length_errors += sstats->rx_length_errors;
-			stats->rx_over_errors += sstats->rx_over_errors;
-			stats->rx_crc_errors += sstats->rx_crc_errors;
-			stats->rx_frame_errors += sstats->rx_frame_errors;
-			stats->rx_fifo_errors += sstats->rx_fifo_errors;
-			stats->rx_missed_errors += sstats->rx_missed_errors;
-
-			stats->tx_aborted_errors += sstats->tx_aborted_errors;
-			stats->tx_carrier_errors += sstats->tx_carrier_errors;
-			stats->tx_fifo_errors += sstats->tx_fifo_errors;
-			stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
-			stats->tx_window_errors += sstats->tx_window_errors;
+			local_stats.rx_packets += sstats->rx_packets;
+			local_stats.rx_bytes += sstats->rx_bytes;
+			local_stats.rx_errors += sstats->rx_errors;
+			local_stats.rx_dropped += sstats->rx_dropped;
+
+			local_stats.tx_packets += sstats->tx_packets;
+			local_stats.tx_bytes += sstats->tx_bytes;
+			local_stats.tx_errors += sstats->tx_errors;
+			local_stats.tx_dropped += sstats->tx_dropped;
+
+			local_stats.multicast += sstats->multicast;
+			local_stats.collisions += sstats->collisions;
+
+			local_stats.rx_length_errors += sstats->rx_length_errors;
+			local_stats.rx_over_errors += sstats->rx_over_errors;
+			local_stats.rx_crc_errors += sstats->rx_crc_errors;
+			local_stats.rx_frame_errors += sstats->rx_frame_errors;
+			local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
+			local_stats.rx_missed_errors += sstats->rx_missed_errors;
+
+			local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
+			local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
+			local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
+			local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
+			local_stats.tx_window_errors += sstats->tx_window_errors;
 		}
 	}
 
+	memcpy(stats,&local_stats,sizeof(struct net_device_stats));
+
 	read_unlock_bh(&bond->lock);
 
 	return stats;
@@ -3943,8 +3942,6 @@ static void bond_set_multicast_list(struct net_device *bond_dev)
 	struct bonding *bond = bond_dev->priv;
 	struct dev_mc_list *dmi;
 
-	write_lock_bh(&bond->lock);
-
 	/*
 	 * Do promisc before checking multicast_mode
 	 */
@@ -3965,6 +3962,8 @@ static void bond_set_multicast_list(struct net_device *bond_dev)
 		bond_set_allmulti(bond, -1);
 	}
 
+	read_lock(&bond->lock);
+
 	bond->flags = bond_dev->flags;
 
 	/* looking for addresses to add to slaves' mc list */
@@ -3985,7 +3984,7 @@ static void bond_set_multicast_list(struct net_device *bond_dev)
 	bond_mc_list_destroy(bond);
 	bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
 
-	write_unlock_bh(&bond->lock);
+	read_unlock(&bond->lock);
 }
 
 /*
@@ -4535,7 +4534,9 @@ static void bond_free_all(void)
 		struct net_device *bond_dev = bond->dev;
 
 		bond_work_cancel_all(bond);
+		netif_tx_lock_bh(bond_dev);
 		bond_mc_list_destroy(bond);
+		netif_tx_unlock_bh(bond_dev);
 		/* Release the bonded slaves */
 		bond_release_all(bond_dev);
 		bond_deinit(bond_dev);
@@ -4551,18 +4552,32 @@ static void bond_free_all(void)
 
 /*
  * Convert string input module parms.  Accept either the
- * number of the mode or its string name.
+ * number of the mode or its string name.  A bit complicated because
+ * some mode names are substrings of other names, and calls from sysfs
+ * may have whitespace in the name (trailing newlines, for example).
  */
-int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
+int bond_parse_parm(const char *buf, struct bond_parm_tbl *tbl)
 {
-	int i;
+	int mode = -1, i, rv;
+	char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
+
+	for (p = (char *)buf; *p; p++)
+		if (!(isdigit(*p) || isspace(*p)))
+			break;
+
+	if (*p)
+		rv = sscanf(buf, "%20s", modestr);
+	else
+		rv = sscanf(buf, "%d", &mode);
+
+	if (!rv)
+		return -1;
 
 	for (i = 0; tbl[i].modename; i++) {
-		if ((isdigit(*mode_arg) &&
-		     tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
-		    (strcmp(mode_arg, tbl[i].modename) == 0)) {
+		if (mode == tbl[i].mode)
+			return tbl[i].mode;
+		if (strcmp(modestr, tbl[i].modename) == 0)
 			return tbl[i].mode;
-		}
 	}
 
 	return -1;
@@ -4876,9 +4891,24 @@ static struct lock_class_key bonding_netdev_xmit_lock_key;
 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
 {
 	struct net_device *bond_dev;
+	struct bonding *bond, *nxt;
 	int res;
 
 	rtnl_lock();
+	down_write(&bonding_rwsem);
+
+	/* Check to see if the bond already exists. */
+	if (name) {
+		list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
+			if (strnicmp(bond->dev->name, name, IFNAMSIZ) == 0) {
+				printk(KERN_ERR DRV_NAME
+			       ": cannot add bond %s; it already exists\n",
+				       name);
+				res = -EPERM;
+				goto out_rtnl;
+			}
+	}
+
 	bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
 				ether_setup);
 	if (!bond_dev) {
@@ -4919,10 +4949,12 @@ int bond_create(char *name, struct bond_params *params, struct bonding **newbond
 
 	netif_carrier_off(bond_dev);
 
+	up_write(&bonding_rwsem);
 	rtnl_unlock(); /* allows sysfs registration of net device */
 	res = bond_create_sysfs_entry(bond_dev->priv);
 	if (res < 0) {
 		rtnl_lock();
+		down_write(&bonding_rwsem);
 		goto out_bond;
 	}
 
@@ -4933,6 +4965,7 @@ out_bond:
 out_netdev:
 	free_netdev(bond_dev);
 out_rtnl:
+	up_write(&bonding_rwsem);
 	rtnl_unlock();
 	return res;
 }
@@ -4953,6 +4986,9 @@ static int __init bonding_init(void)
 #ifdef CONFIG_PROC_FS
 	bond_create_proc_dir();
 #endif
+
+	init_rwsem(&bonding_rwsem);
+
 	for (i = 0; i < max_bonds; i++) {
 		res = bond_create(NULL, &bonding_defaults, NULL);
 		if (res)
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 51475a1..dbd9b96 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -110,11 +110,10 @@ static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t
 {
 	char command[IFNAMSIZ + 1] = {0, };
 	char *ifname;
-	int res = count;
+	int rv, res = count;
 	struct bonding *bond;
 	struct bonding *nxt;
 
-	down_write(&(bonding_rwsem));
 	sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 	ifname = command + 1;
 	if ((strlen(command) <= 1) ||
@@ -122,39 +121,28 @@ static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t
 		goto err_no_cmd;
 
 	if (command[0] == '+') {
-
-		/* Check to see if the bond already exists. */
-		list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
-			if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
-				printk(KERN_ERR DRV_NAME
-					": cannot add bond %s; it already exists\n",
-					ifname);
-				res = -EPERM;
-				goto out;
-			}
-
 		printk(KERN_INFO DRV_NAME
 			": %s is being created...\n", ifname);
-		if (bond_create(ifname, &bonding_defaults, &bond)) {
-			printk(KERN_INFO DRV_NAME
-			": %s interface already exists. Bond creation failed.\n",
-			ifname);
-			res = -EPERM;
+		rv = bond_create(ifname, &bonding_defaults, &bond);
+		if (rv) {
+			printk(KERN_INFO DRV_NAME ": Bond creation failed.\n");
+			res = rv;
 		}
 		goto out;
 	}
 
 	if (command[0] == '-') {
+		rtnl_lock();
+		down_write(&bonding_rwsem);
+
 		list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
 			if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
-				rtnl_lock();
 				/* check the ref count on the bond's kobject.
 				 * If it's > expected, then there's a file open,
 				 * and we have to fail.
 				 */
 				if (atomic_read(&bond->dev->class_dev.kobj.kref.refcount)
 							> expected_refcount){
-					rtnl_unlock();
 					printk(KERN_INFO DRV_NAME
 						": Unable remove bond %s due to open references.\n",
 						ifname);
@@ -165,6 +153,7 @@ static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t
 					": %s is being deleted...\n",
 					bond->dev->name);
 				bond_destroy(bond);
+				up_write(&bonding_rwsem);
 				rtnl_unlock();
 				goto out;
 			}
@@ -172,6 +161,8 @@ static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t
 		printk(KERN_ERR DRV_NAME
 			": unable to delete non-existent bond %s\n", ifname);
 		res = -ENODEV;
+		up_write(&bonding_rwsem);
+		rtnl_unlock();
 		goto out;
 	}
 
@@ -184,7 +175,6 @@ err_no_cmd:
 	 * get called forever, which is bad.
 	 */
 out:
-	up_write(&(bonding_rwsem));
 	return res;
 }
 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
@@ -270,6 +260,9 @@ static ssize_t bonding_store_slaves(struct class_device *cd, const char *buffer,
 
 	/* Note:  We can't hold bond->lock here, as bond_create grabs it. */
 
+	rtnl_lock();
+	down_write(&(bonding_rwsem));
+
 	sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 	ifname = command + 1;
 	if ((strlen(command) <= 1) ||
@@ -334,9 +327,7 @@ static ssize_t bonding_store_slaves(struct class_device *cd, const char *buffer,
 				dev->mtu = bond->dev->mtu;
 			}
 		}
-		rtnl_lock();
 		res = bond_enslave(bond->dev, dev);
-		rtnl_unlock();
 		if (res) {
 			ret = res;
 		}
@@ -353,12 +344,10 @@ static ssize_t bonding_store_slaves(struct class_device *cd, const char *buffer,
 		if (dev) {
 			printk(KERN_INFO DRV_NAME ": %s: Removing slave %s\n",
 				bond->dev->name, dev->name);
-			rtnl_lock();
 			if (bond->setup_by_slave)
 				res = bond_release_and_destroy(bond->dev, dev);
 			else
 				res = bond_release(bond->dev, dev);
-			rtnl_unlock();
 			if (res) {
 				ret = res;
 				goto out;
@@ -383,6 +372,8 @@ err_no_cmd:
 	ret = -EPERM;
 
 out:
+	up_write(&(bonding_rwsem));
+	rtnl_unlock();
 	return ret;
 }
 
@@ -414,7 +405,7 @@ static ssize_t bonding_store_mode(struct class_device *cd, const char *buf, size
 		goto out;
 	}
 
-	new_value = bond_parse_parm((char *)buf, bond_mode_tbl);
+	new_value = bond_parse_parm(buf, bond_mode_tbl);
 	if (new_value < 0)  {
 		printk(KERN_ERR DRV_NAME
 		       ": %s: Ignoring invalid mode value %.*s.\n",
@@ -465,7 +456,7 @@ static ssize_t bonding_store_xmit_hash(struct class_device *cd, const char *buf,
 		goto out;
 	}
 
-	new_value = bond_parse_parm((char *)buf, xmit_hashtype_tbl);
+	new_value = bond_parse_parm(buf, xmit_hashtype_tbl);
 	if (new_value < 0)  {
 		printk(KERN_ERR DRV_NAME
 		       ": %s: Ignoring invalid xmit hash policy value %.*s.\n",
@@ -501,7 +492,7 @@ static ssize_t bonding_store_arp_validate(struct class_device *cd, const char *b
 	int new_value;
 	struct bonding *bond = to_bond(cd);
 
-	new_value = bond_parse_parm((char *)buf, arp_validate_tbl);
+	new_value = bond_parse_parm(buf, arp_validate_tbl);
 	if (new_value < 0) {
 		printk(KERN_ERR DRV_NAME
 		       ": %s: Ignoring invalid arp_validate value %s\n",
@@ -906,7 +897,7 @@ static ssize_t bonding_store_lacp(struct class_device *cd, const char *buf, size
 		goto out;
 	}
 
-	new_value = bond_parse_parm((char *)buf, bond_lacp_tbl);
+	new_value = bond_parse_parm(buf, bond_lacp_tbl);
 
 	if ((new_value == 1) || (new_value == 0)) {
 		bond->params.lacp_fast = new_value;
@@ -1365,8 +1356,6 @@ int bond_create_sysfs(void)
 	int ret = 0;
 	struct bonding *firstbond;
 
-	init_rwsem(&bonding_rwsem);
-
 	/* get the netdev class pointer */
 	firstbond = container_of(bond_dev_list.next, struct bonding, bond_list);
 	if (!firstbond)
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index aa27cbd..698c170 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -22,8 +22,8 @@
 #include "bond_3ad.h"
 #include "bond_alb.h"
 
-#define DRV_VERSION	"3.2.3"
-#define DRV_RELDATE	"December 6, 2007"
+#define DRV_VERSION	"3.2.4"
+#define DRV_RELDATE	"January 28, 2008"
 #define DRV_NAME	"bonding"
 #define DRV_DESCRIPTION	"Ethernet Channel Bonding Driver"
 
@@ -141,6 +141,8 @@ struct bond_parm_tbl {
 	int mode;
 };
 
+#define BOND_MAX_MODENAME_LEN 20
+
 struct vlan_entry {
 	struct list_head vlan_list;
 	__be32 vlan_ip;
@@ -313,7 +315,7 @@ void bond_mii_monitor(void *);
 void bond_loadbalance_arp_mon(void *);
 void bond_activebackup_arp_mon(void *);
 void bond_set_mode_ops(struct bonding *bond, int mode);
-int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl);
+int bond_parse_parm(const char *mode_arg, struct bond_parm_tbl *tbl);
 void bond_select_active_slave(struct bonding *bond);
 void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
 void bond_register_arp(struct bonding *);