mac80211: dont use interface indices in drivers

This patch gets rid of the if_id stuff where possible in favour of
a new per-virtual-interface structure "struct ieee80211_vif". This
structure is located at the end of the per-interface structure and
contains a variable length driver-use data area.

This has two advantages:
 * removes the need to look up interfaces by if_id, this is better
   for working with network namespaces and performance
 * allows drivers to store and retrieve per-interface data without
   having to allocate own lists/hash tables

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/mac80211/ieee80211_iface.c b/net/mac80211/ieee80211_iface.c
index 7cfd8660b231..b72066378805 100644
--- a/net/mac80211/ieee80211_iface.c
+++ b/net/mac80211/ieee80211_iface.c
@@ -47,7 +47,7 @@ int ieee80211_if_add(struct net_device *dev, const char *name,
         int ret;
 
         ASSERT_RTNL();
-        ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
+        ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
                             name, ieee80211_if_setup);
         if (!ndev)
                 return -ENOMEM;