mac80211: support runtime interface type changes

Add support to mac80211 for changing the interface
type even when the interface is UP, if the driver
supports it.

To achieve this
 * add a new driver callback for switching,
 * split some of the interface up/down code out
   into new functions (do_open/do_stop), and
 * maintain an own __SDATA_RUNNING bit that will
   not be set during interface type, so that any
   other code doesn't use the interface.

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

1 files changed, 0 insertions, 3 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index f82b18e996b2..5de1ca3f17b9 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -52,9 +52,6 @@ static int ieee80211_change_iface(struct wiphy *wiphy,
         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
         int ret;
 
-        if (ieee80211_sdata_running(sdata))
-                return -EBUSY;
-
         ret = ieee80211_if_change_type(sdata, type);
         if (ret)
                 return ret;