1 files changed, 47 insertions, 7 deletions

diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index 319ec2a1d84f..4e345f82f044 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -314,22 +314,43 @@ static int ieee80211_open(struct net_device *dev)
         int res;
 
         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
         read_lock(&local->sub_if_lock);
         list_for_each_entry(nsdata, &local->sub_if_list, list) {
                 struct net_device *ndev = nsdata->dev;
 
                 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
-                    compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0 &&
-                    !identical_mac_addr_allowed(sdata->type, nsdata->type)) {
-                        read_unlock(&local->sub_if_lock);
-                        return -ENOTUNIQ;
+                    compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0) {
+                        /*
+                         * check whether it may have the same address
+                         */
+                        if (!identical_mac_addr_allowed(sdata->type,
+                                                        nsdata->type)) {
+                                read_unlock(&local->sub_if_lock);
+                                return -ENOTUNIQ;
+                        }
+
+                        /*
+                         * can only add VLANs to enabled APs
+                         */
+                        if (sdata->type == IEEE80211_IF_TYPE_VLAN &&
+                            nsdata->type == IEEE80211_IF_TYPE_AP &&
+                            netif_running(nsdata->dev))
+                                sdata->u.vlan.ap = nsdata;
                 }
         }
         read_unlock(&local->sub_if_lock);
 
-        if (sdata->type == IEEE80211_IF_TYPE_WDS &&
-            is_zero_ether_addr(sdata->u.wds.remote_addr))
-                return -ENOLINK;
+        switch (sdata->type) {
+        case IEEE80211_IF_TYPE_WDS:
+                if (is_zero_ether_addr(sdata->u.wds.remote_addr))
+                        return -ENOLINK;
+                break;
+        case IEEE80211_IF_TYPE_VLAN:
+                if (!sdata->u.vlan.ap)
+                        return -ENOLINK;
+                break;
+        }
 
         if (local->open_count == 0) {
                 res = 0;
@@ -340,6 +361,10 @@ static int ieee80211_open(struct net_device *dev)
         }
 
         switch (sdata->type) {
+        case IEEE80211_IF_TYPE_VLAN:
+                list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
+                /* no need to tell driver */
+                break;
         case IEEE80211_IF_TYPE_MNTR:
                 /* must be before the call to ieee80211_configure_filter */
                 local->monitors++;
@@ -407,9 +432,24 @@ static int ieee80211_stop(struct net_device *dev)
 
         dev_mc_unsync(local->mdev, dev);
 
+        /* down all dependent devices, that is VLANs */
+        if (sdata->type == IEEE80211_IF_TYPE_AP) {
+                struct ieee80211_sub_if_data *vlan, *tmp;
+
+                list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
+                                         u.vlan.list)
+                        dev_close(vlan->dev);
+                WARN_ON(!list_empty(&sdata->u.ap.vlans));
+        }
+
         local->open_count--;
 
         switch (sdata->type) {
+        case IEEE80211_IF_TYPE_VLAN:
+                list_del(&sdata->u.vlan.list);
+                sdata->u.vlan.ap = NULL;
+                /* no need to tell driver */
+                break;
         case IEEE80211_IF_TYPE_MNTR:
                 local->monitors--;
                 if (local->monitors == 0) {