On Tue, 2014-02-25 at 20:30 +0100, Arend van Spriel wrote:

Upon deleting the interface a cfg80211_disconnected() is called under
rtnl_lock. Right after the unlocking the rtnl_lock we unregister the
network device. This patch adds delay before unregister so cfg80211
can handle disconnect and notify wpa_supplicant.

+				/* make sure cfg80211 can send disconnect event
+				 * before unregistering the netdevice below.
+				 */
+				msleep(100);

This has got to be one of the worst hacks I've seen in wireless so
far ... :)

johannes