hostapd madwifi in ap mode

If you are using hostapd, and hostpad is showing the following error:

ioctl[IEEE80211_IOCTL_DELKEY]: Invalid argument
ioctl[IEEE80211_IOCTL_SETMLME]: Invalid argument

Try to add :

wme_enabled=0

in hostapd.conf

This is documented in http://madwifi-project.org/ticket/1561 and it worked for me.