[VLAN]: Avoid a 4-order allocation.

This patch splits the vlan_group struct into a multi-allocated struct. On
x86_64, the size of the original struct is a little more than 32KB, causing
a 4-order allocation, which is prune to problems caused by buddy-system
external fragmentation conditions.

I couldn't just use vmalloc() because vfree() cannot be called in the
softirq context of the RCU callback.

Signed-off-by: Dan Aloni <da-x@monatomic.org>
Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

22 files changed, 102 insertions, 80 deletions

diff --git a/drivers/net/8139cp.c b/drivers/net/8139cp.c
index 6f93a765e564..12c8453f44bc 100644
--- a/drivers/net/8139cp.c
+++ b/drivers/net/8139cp.c
@@ -448,8 +448,7 @@ static void cp_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
         spin_lock_irqsave(&cp->lock, flags);
         cp->cpcmd &= ~RxVlanOn;
         cpw16(CpCmd, cp->cpcmd);
-        if (cp->vlgrp)
-                cp->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(cp->vlgrp, vid, NULL);
         spin_unlock_irqrestore(&cp->lock, flags);
 }
 #endif /* CP_VLAN_TAG_USED */
diff --git a/drivers/net/acenic.c b/drivers/net/acenic.c
index 33c6645455ae..7138e0e025bc 100644
--- a/drivers/net/acenic.c
+++ b/drivers/net/acenic.c
@@ -2293,10 +2293,7 @@ static void ace_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
 
         local_irq_save(flags);
         ace_mask_irq(dev);
-
-        if (ap->vlgrp)
-                ap->vlgrp->vlan_devices[vid] = NULL;
-
+        vlan_group_set_device(ap->vlgrp, vid, NULL);
         ace_unmask_irq(dev);
         local_irq_restore(flags);
 }
diff --git a/drivers/net/amd8111e.c b/drivers/net/amd8111e.c
index 9c399aaefbdd..962c954c2d56 100644
--- a/drivers/net/amd8111e.c
+++ b/drivers/net/amd8111e.c
@@ -1737,8 +1737,7 @@ static void amd8111e_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid
 {
         struct amd8111e_priv *lp = netdev_priv(dev);
         spin_lock_irq(&lp->lock);
-        if (lp->vlgrp)
-                lp->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(lp->vlgrp, vid, NULL);
         spin_unlock_irq(&lp->lock);
 }
 #endif
diff --git a/drivers/net/atl1/atl1_main.c b/drivers/net/atl1/atl1_main.c
index 65673485bb6b..88d4f70035bb 100644
--- a/drivers/net/atl1/atl1_main.c
+++ b/drivers/net/atl1/atl1_main.c
@@ -1252,8 +1252,7 @@ static void atl1_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
 
         spin_lock_irqsave(&adapter->lock, flags);
         /* atl1_irq_disable(adapter); */
-        if (adapter->vlgrp)
-                adapter->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(adapter->vlgrp, vid, NULL);
         /* atl1_irq_enable(adapter); */
         spin_unlock_irqrestore(&adapter->lock, flags);
         /* We don't do Vlan filtering */
@@ -1266,7 +1265,7 @@ static void atl1_restore_vlan(struct atl1_adapter *adapter)
         if (adapter->vlgrp) {
                 u16 vid;
                 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
-                        if (!adapter->vlgrp->vlan_devices[vid])
+                        if (!vlan_group_get_device(adapter->vlgrp, vid))
                                 continue;
                         atl1_vlan_rx_add_vid(adapter->netdev, vid);
                 }
diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index 5a96d7611af1..c12e5ea61819 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -4467,9 +4467,7 @@ bnx2_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid)
         struct bnx2 *bp = netdev_priv(dev);
 
         bnx2_netif_stop(bp);
-
-        if (bp->vlgrp)
-                bp->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(bp->vlgrp, vid, NULL);
         bnx2_set_rx_mode(dev);
 
         bnx2_netif_start(bp);
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index a7c8f98a890c..ea73ebff4387 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -488,9 +488,9 @@ static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
                         /* Save and then restore vlan_dev in the grp array,
                          * since the slave's driver might clear it.
                          */
-                        vlan_dev = bond->vlgrp->vlan_devices[vid];
+                        vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
                         slave_dev->vlan_rx_kill_vid(slave_dev, vid);
-                        bond->vlgrp->vlan_devices[vid] = vlan_dev;
+                        vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
                 }
         }
 
@@ -550,9 +550,9 @@ static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *s
                 /* Save and then restore vlan_dev in the grp array,
                  * since the slave's driver might clear it.
                  */
-                vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
+                vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
                 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
-                bond->vlgrp->vlan_devices[vlan->vlan_id] = vlan_dev;
+                vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
         }
 
 unreg:
@@ -2397,7 +2397,7 @@ static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
                 vlan_id = 0;
                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
                                          vlan_list) {
-                        vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
+                        vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
                         if (vlan_dev == rt->u.dst.dev) {
                                 vlan_id = vlan->vlan_id;
                                 dprintk("basa: vlan match on %s %d\n",
@@ -2444,7 +2444,7 @@ static void bond_send_gratuitous_arp(struct bonding *bond)
         }
 
         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
-                vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
+                vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
                 if (vlan->vlan_ip) {
                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
                                       vlan->vlan_ip, vlan->vlan_id);
@@ -3371,7 +3371,7 @@ static int bond_inetaddr_event(struct notifier_block *this, unsigned long event,
 
                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
                                          vlan_list) {
-                        vlan_dev = bond->vlgrp->vlan_devices[vlan->vlan_id];
+                        vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
                         if (vlan_dev == event_dev) {
                                 switch (event) {
                                 case NETDEV_UP:
diff --git a/drivers/net/chelsio/cxgb2.c b/drivers/net/chelsio/cxgb2.c
index 7d0f24f69777..125c9b105869 100644
--- a/drivers/net/chelsio/cxgb2.c
+++ b/drivers/net/chelsio/cxgb2.c
@@ -889,8 +889,7 @@ static void vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
         struct adapter *adapter = dev->priv;
 
         spin_lock_irq(&adapter->async_lock);
-        if (adapter->vlan_grp)
-                adapter->vlan_grp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(adapter->vlan_grp, vid, NULL);
         spin_unlock_irq(&adapter->async_lock);
 }
 #endif
diff --git a/drivers/net/cxgb3/cxgb3_offload.c b/drivers/net/cxgb3/cxgb3_offload.c
index b2cf5f6feb4a..f6ed033efb56 100644
--- a/drivers/net/cxgb3/cxgb3_offload.c
+++ b/drivers/net/cxgb3/cxgb3_offload.c
@@ -160,14 +160,16 @@ static struct net_device *get_iff_from_mac(struct adapter *adapter,
         int i;
 
         for_each_port(adapter, i) {
-                const struct vlan_group *grp;
+                struct vlan_group *grp;
                 struct net_device *dev = adapter->port[i];
                 const struct port_info *p = netdev_priv(dev);
 
                 if (!memcmp(dev->dev_addr, mac, ETH_ALEN)) {
                         if (vlan && vlan != VLAN_VID_MASK) {
                                 grp = p->vlan_grp;
-                                dev = grp ? grp->vlan_devices[vlan] : NULL;
+                                dev = NULL;
+                                if (grp)
+                                        dev = vlan_group_get_device(grp, vlan);
                         } else
                                 while (dev->master)
                                         dev = dev->master;
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 98215fdd7d10..1d08e937af82 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -376,7 +376,7 @@ e1000_update_mng_vlan(struct e1000_adapter *adapter)
         uint16_t vid = adapter->hw.mng_cookie.vlan_id;
         uint16_t old_vid = adapter->mng_vlan_id;
         if (adapter->vlgrp) {
-                if (!adapter->vlgrp->vlan_devices[vid]) {
+                if (!vlan_group_get_device(adapter->vlgrp, vid)) {
                         if (adapter->hw.mng_cookie.status &
                                 E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) {
                                 e1000_vlan_rx_add_vid(netdev, vid);
@@ -386,7 +386,7 @@ e1000_update_mng_vlan(struct e1000_adapter *adapter)
 
                         if ((old_vid != (uint16_t)E1000_MNG_VLAN_NONE) &&
                                         (vid != old_vid) &&
-                                        !adapter->vlgrp->vlan_devices[old_vid])
+                            !vlan_group_get_device(adapter->vlgrp, old_vid))
                                 e1000_vlan_rx_kill_vid(netdev, old_vid);
                 } else
                         adapter->mng_vlan_id = vid;
@@ -1482,7 +1482,7 @@ e1000_close(struct net_device *netdev)
         if ((adapter->hw.mng_cookie.status &
                           E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) &&
              !(adapter->vlgrp &&
-                          adapter->vlgrp->vlan_devices[adapter->mng_vlan_id])) {
+               vlan_group_get_device(adapter->vlgrp, adapter->mng_vlan_id))) {
                 e1000_vlan_rx_kill_vid(netdev, adapter->mng_vlan_id);
         }
 
@@ -4998,10 +4998,7 @@ e1000_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
         uint32_t vfta, index;
 
         e1000_irq_disable(adapter);
-
-        if (adapter->vlgrp)
-                adapter->vlgrp->vlan_devices[vid] = NULL;
-
+        vlan_group_set_device(adapter->vlgrp, vid, NULL);
         e1000_irq_enable(adapter);
 
         if ((adapter->hw.mng_cookie.status &
@@ -5027,7 +5024,7 @@ e1000_restore_vlan(struct e1000_adapter *adapter)
         if (adapter->vlgrp) {
                 uint16_t vid;
                 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
-                        if (!adapter->vlgrp->vlan_devices[vid])
+                        if (!vlan_group_get_device(adapter->vlgrp, vid))
                                 continue;
                         e1000_vlan_rx_add_vid(adapter->netdev, vid);
                 }
diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c
index 88ad1c8bcee4..0e4042bc0a48 100644
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -1939,8 +1939,7 @@ static void ehea_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
         int index;
         u64 hret;
 
-        if (port->vgrp)
-                port->vgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(port->vgrp, vid, NULL);
 
         cb1 = kzalloc(PAGE_SIZE, GFP_KERNEL);
         if (!cb1) {
diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 1f83988a6a64..02b61b85b62c 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -1132,8 +1132,7 @@ static void gfar_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid)
 
         spin_lock_irqsave(&priv->rxlock, flags);
 
-        if (priv->vlgrp)
-                priv->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(priv->vgrp, vid, NULL);
 
         spin_unlock_irqrestore(&priv->rxlock, flags);
 }
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index 0c3682889344..afc2ec72529e 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -2213,8 +2213,7 @@ ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
 
         ixgb_irq_disable(adapter);
 
-        if(adapter->vlgrp)
-                adapter->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(adapter->vlgrp, vid, NULL);
 
         ixgb_irq_enable(adapter);
 
@@ -2234,7 +2233,7 @@ ixgb_restore_vlan(struct ixgb_adapter *adapter)
         if(adapter->vlgrp) {
                 uint16_t vid;
                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
-                        if(!adapter->vlgrp->vlan_devices[vid])
+                        if(!vlan_group_get_device(adapter->vlgrp, vid))
                                 continue;
                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
                 }
diff --git a/drivers/net/ns83820.c b/drivers/net/ns83820.c
index 568daeb3e9d8..9ec6e9e54f47 100644
--- a/drivers/net/ns83820.c
+++ b/drivers/net/ns83820.c
@@ -514,8 +514,7 @@ static void ns83820_vlan_rx_kill_vid(struct net_device *ndev, unsigned short vid
 
         spin_lock_irq(&dev->misc_lock);
         spin_lock(&dev->tx_lock);
-        if (dev->vlgrp)
-                dev->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(dev->vlgrp, vid, NULL);
         spin_unlock(&dev->tx_lock);
         spin_unlock_irq(&dev->misc_lock);
 }
diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 13cf06ee97f7..15d954e50cae 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -890,8 +890,7 @@ static void rtl8169_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
         unsigned long flags;
 
         spin_lock_irqsave(&tp->lock, flags);
-        if (tp->vlgrp)
-                tp->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(tp->vlgrp, vid, NULL);
         spin_unlock_irqrestore(&tp->lock, flags);
 }
 
diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index 44bb2395af84..46ebf141ee5a 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -325,8 +325,7 @@ static void s2io_vlan_rx_kill_vid(struct net_device *dev, unsigned long vid)
         unsigned long flags;
 
         spin_lock_irqsave(&nic->tx_lock, flags);
-        if (nic->vlgrp)
-                nic->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(nic->vlgrp, vid, NULL);
         spin_unlock_irqrestore(&nic->tx_lock, flags);
 }
 
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 52edbd7ac17e..53839979cfb8 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1053,8 +1053,7 @@ static void sky2_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
 
         sky2_write32(hw, SK_REG(port, RX_GMF_CTRL_T), RX_VLAN_STRIP_OFF);
         sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T), TX_VLAN_TAG_OFF);
-        if (sky2->vlgrp)
-                sky2->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(sky2->vlgrp, vid, NULL);
 
         netif_tx_unlock_bh(dev);
 }
diff --git a/drivers/net/starfire.c b/drivers/net/starfire.c
index bf873ea25797..8bba2e3da7e1 100644
--- a/drivers/net/starfire.c
+++ b/drivers/net/starfire.c
@@ -677,8 +677,7 @@ static void netdev_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
         spin_lock(&np->lock);
         if (debug > 1)
                 printk("%s: removing vlanid %d from vlan filter\n", dev->name, vid);
-        if (np->vlgrp)
-                np->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(np->vlgrp, vid, NULL);
         set_rx_mode(dev);
         spin_unlock(&np->lock);
 }
@@ -1738,7 +1737,7 @@ static void set_rx_mode(struct net_device *dev)
                 int vlan_count = 0;
                 void __iomem *filter_addr = ioaddr + HashTable + 8;
                 for (i = 0; i < VLAN_VID_MASK; i++) {
-                        if (np->vlgrp->vlan_devices[i]) {
+                        if (vlan_group_get_device(np->vlgrp, i)) {
                                 if (vlan_count >= 32)
                                         break;
                                 writew(cpu_to_be16(i), filter_addr);
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 26c6ac48288c..8c8f9f4d47a5 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -9114,8 +9114,7 @@ static void tg3_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
                 tg3_netif_stop(tp);
 
         tg3_full_lock(tp, 0);
-        if (tp->vlgrp)
-                tp->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(tp->vlgrp, vid, NULL);
         tg3_full_unlock(tp);
 
         if (netif_running(dev))
diff --git a/drivers/net/typhoon.c b/drivers/net/typhoon.c
index 9781b16bb8b6..0d91d094edd9 100644
--- a/drivers/net/typhoon.c
+++ b/drivers/net/typhoon.c
@@ -746,8 +746,7 @@ typhoon_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
 {
         struct typhoon *tp = netdev_priv(dev);
         spin_lock_bh(&tp->state_lock);
-        if(tp->vlgrp)
-                tp->vlgrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(tp->vlgrp, vid, NULL);
         spin_unlock_bh(&tp->state_lock);
 }
 
diff --git a/drivers/s390/net/qeth_main.c b/drivers/s390/net/qeth_main.c
index 2257e45594b3..d8a86f5af379 100644
--- a/drivers/s390/net/qeth_main.c
+++ b/drivers/s390/net/qeth_main.c
@@ -3654,7 +3654,7 @@ qeth_verify_vlan_dev(struct net_device *dev, struct qeth_card *card)
                 return rc;
 
         for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++){
-                if (vg->vlan_devices[i] == dev){
+                if (vlan_group_get_device(vg, i) == dev){
                         rc = QETH_VLAN_CARD;
                         break;
                 }
@@ -5261,7 +5261,7 @@ qeth_free_vlan_addresses4(struct qeth_card *card, unsigned short vid)
         QETH_DBF_TEXT(trace, 4, "frvaddr4");
 
         rcu_read_lock();
-        in_dev = __in_dev_get_rcu(card->vlangrp->vlan_devices[vid]);
+        in_dev = __in_dev_get_rcu(vlan_group_get_device(card->vlangrp, vid));
         if (!in_dev)
                 goto out;
         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
@@ -5288,7 +5288,7 @@ qeth_free_vlan_addresses6(struct qeth_card *card, unsigned short vid)
 
         QETH_DBF_TEXT(trace, 4, "frvaddr6");
 
-        in6_dev = in6_dev_get(card->vlangrp->vlan_devices[vid]);
+        in6_dev = in6_dev_get(vlan_group_get_device(card->vlangrp, vid));
         if (!in6_dev)
                 return;
         for (ifa = in6_dev->addr_list; ifa; ifa = ifa->lst_next){
@@ -5360,7 +5360,7 @@ qeth_layer2_process_vlans(struct qeth_card *card, int clear)
         if (!card->vlangrp)
                 return;
         for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
-                if (card->vlangrp->vlan_devices[i] == NULL)
+                if (vlan_group_get_device(card->vlangrp, i) == NULL)
                         continue;
                 if (clear)
                         qeth_layer2_send_setdelvlan(card, i, IPA_CMD_DELVLAN);
@@ -5398,8 +5398,7 @@ qeth_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
         spin_lock_irqsave(&card->vlanlock, flags);
         /* unregister IP addresses of vlan device */
         qeth_free_vlan_addresses(card, vid);
-        if (card->vlangrp)
-                card->vlangrp->vlan_devices[vid] = NULL;
+        vlan_group_set_device(card->vlangrp, vid, NULL);
         spin_unlock_irqrestore(&card->vlanlock, flags);
         if (card->options.layer2)
                 qeth_layer2_send_setdelvlan(card, vid, IPA_CMD_DELVLAN);
@@ -5662,10 +5661,11 @@ qeth_add_vlan_mc(struct qeth_card *card)
 
         vg = card->vlangrp;
         for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
-                if (vg->vlan_devices[i] == NULL ||
-                    !(vg->vlan_devices[i]->flags & IFF_UP))
+                struct net_device *netdev = vlan_group_get_device(vg, i);
+                if (netdev == NULL ||
+                    !(netdev->flags & IFF_UP))
                         continue;
-                in_dev = in_dev_get(vg->vlan_devices[i]);
+                in_dev = in_dev_get(netdev);
                 if (!in_dev)
                         continue;
                 read_lock(&in_dev->mc_list_lock);
@@ -5749,10 +5749,11 @@ qeth_add_vlan_mc6(struct qeth_card *card)
 
         vg = card->vlangrp;
         for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
-                if (vg->vlan_devices[i] == NULL ||
-                    !(vg->vlan_devices[i]->flags & IFF_UP))
+                struct net_device *netdev = vlan_group_get_device(vg, i);
+                if (netdev == NULL ||
+                    !(netdev->flags & IFF_UP))
                         continue;
-                in_dev = in6_dev_get(vg->vlan_devices[i]);
+                in_dev = in6_dev_get(netdev);
                 if (!in_dev)
                         continue;
                 read_lock(&in_dev->lock);
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 35cb38573583..d103580c72d2 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -70,15 +70,34 @@ extern void vlan_ioctl_set(int (*hook)(void __user *));
  * depends on completely exhausting the VLAN identifier space.  Thus
  * it gives constant time look-up, but in many cases it wastes memory.
  */
-#define VLAN_GROUP_ARRAY_LEN 4096
+#define VLAN_GROUP_ARRAY_LEN          4096
+#define VLAN_GROUP_ARRAY_SPLIT_PARTS  8
+#define VLAN_GROUP_ARRAY_PART_LEN     (VLAN_GROUP_ARRAY_LEN/VLAN_GROUP_ARRAY_SPLIT_PARTS)
 
 struct vlan_group {
         int real_dev_ifindex; /* The ifindex of the ethernet(like) device the vlan is attached to. */
         struct hlist_node       hlist;  /* linked list */
-        struct net_device *vlan_devices[VLAN_GROUP_ARRAY_LEN];
+        struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
         struct rcu_head         rcu;
 };
 
+static inline struct net_device *vlan_group_get_device(struct vlan_group *vg, int vlan_id)
+{
+        struct net_device **array;
+        array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
+        return array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN];
+}
+
+static inline void vlan_group_set_device(struct vlan_group *vg, int vlan_id,
+                                         struct net_device *dev)
+{
+        struct net_device **array;
+        if (!vg)
+                return;
+        array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
+        array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
+}
+
 struct vlan_priority_tci_mapping {
         unsigned long priority;
         unsigned short vlan_qos; /* This should be shifted when first set, so we only do it
@@ -160,7 +179,7 @@ static inline int __vlan_hwaccel_rx(struct sk_buff *skb,
                 return NET_RX_DROP;
         }
 
-        skb->dev = grp->vlan_devices[vlan_tag & VLAN_VID_MASK];
+        skb->dev = vlan_group_get_device(grp, vlan_tag & VLAN_VID_MASK);
         if (skb->dev == NULL) {
                 dev_kfree_skb_any(skb);
 
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index c1c205fad4fb..eb1c71ed7dfe 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -184,14 +184,23 @@ struct net_device *__find_vlan_dev(struct net_device *real_dev,
         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
 
         if (grp)
-                return grp->vlan_devices[VID];
+                return vlan_group_get_device(grp, VID);
 
         return NULL;
 }
 
+static void vlan_group_free(struct vlan_group *grp)
+{
+        int i;
+
+        for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
+                kfree(grp->vlan_devices_arrays[i]);
+        kfree(grp);
+}
+
 static void vlan_rcu_free(struct rcu_head *rcu)
 {
-        kfree(container_of(rcu, struct vlan_group, rcu));
+        vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 }
 
 
@@ -223,7 +232,7 @@ static int unregister_vlan_dev(struct net_device *real_dev,
         ret = 0;
 
         if (grp) {
-                dev = grp->vlan_devices[vlan_id];
+                dev = vlan_group_get_device(grp, vlan_id);
                 if (dev) {
                         /* Remove proc entry */
                         vlan_proc_rem_dev(dev);
@@ -237,7 +246,7 @@ static int unregister_vlan_dev(struct net_device *real_dev,
                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
                         }
 
-                        grp->vlan_devices[vlan_id] = NULL;
+                        vlan_group_set_device(grp, vlan_id, NULL);
                         synchronize_net();
 
 
@@ -251,7 +260,7 @@ static int unregister_vlan_dev(struct net_device *real_dev,
                          * group.
                          */
                         for (i = 0; i < VLAN_VID_MASK; i++)
-                                if (grp->vlan_devices[i])
+                                if (vlan_group_get_device(grp, i))
                                         break;
 
                         if (i == VLAN_VID_MASK) {
@@ -379,6 +388,7 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
         struct net_device *new_dev;
         struct net_device *real_dev; /* the ethernet device */
         char name[IFNAMSIZ];
+        int i;
 
 #ifdef VLAN_DEBUG
         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
@@ -544,6 +554,15 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
                 if (!grp)
                         goto out_free_unregister;
 
+                for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
+                        grp->vlan_devices_arrays[i] = kzalloc(
+                                sizeof(struct net_device *)*VLAN_GROUP_ARRAY_PART_LEN,
+                                GFP_KERNEL);
+
+                        if (!grp->vlan_devices_arrays[i])
+                                goto out_free_arrays;
+                }
+
                 /* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
                 grp->real_dev_ifindex = real_dev->ifindex;
 
@@ -554,7 +573,7 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
                         real_dev->vlan_rx_register(real_dev, grp);
         }
 
-        grp->vlan_devices[VLAN_ID] = new_dev;
+        vlan_group_set_device(grp, VLAN_ID, new_dev);
 
         if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
@@ -571,6 +590,9 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
 #endif
         return new_dev;
 
+out_free_arrays:
+        vlan_group_free(grp);
+
 out_free_unregister:
         unregister_netdev(new_dev);
         goto out_unlock;
@@ -606,7 +628,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
         case NETDEV_CHANGE:
                 /* Propagate real device state to vlan devices */
                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
-                        vlandev = grp->vlan_devices[i];
+                        vlandev = vlan_group_get_device(grp, i);
                         if (!vlandev)
                                 continue;
 
@@ -617,7 +639,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
         case NETDEV_DOWN:
                 /* Put all VLANs for this dev in the down state too.  */
                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
-                        vlandev = grp->vlan_devices[i];
+                        vlandev = vlan_group_get_device(grp, i);
                         if (!vlandev)
                                 continue;
 
@@ -632,7 +654,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
         case NETDEV_UP:
                 /* Put all VLANs for this dev in the up state too.  */
                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
-                        vlandev = grp->vlan_devices[i];
+                        vlandev = vlan_group_get_device(grp, i);
                         if (!vlandev)
                                 continue;
 
@@ -649,7 +671,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
                         int ret;
 
-                        vlandev = grp->vlan_devices[i];
+                        vlandev = vlan_group_get_device(grp, i);
                         if (!vlandev)
                                 continue;