ioctl[IEEE80211_IOCTL_SETMLME]: Invalid argument

[GD]

hi~
My hardware use latest madwifi driver.
I hope that I can send a disassociation message to STA, and make STA
disassociate from my wireless card (hostAP).

When I invoke hostapd_sta_disassoc(), it actually invokes
madwifi_sta_disassoc() in driver_madwifi.c and I got the following message:

ioctl[IEEE80211_IOCTL_SETMLME]: Invalid argument

Is this madwifi driver's bug?