802.11r broken in recent master (NL80211_ATTR_STA_VLAN errors)?

Thanks for the tip!
It looks like 802.11r FT works on WRT1900ACV2(ACS) and WRT1900ACS, but occasionally throws errors !?
I have just put FT-OVER-DS setting to FT-OVER-THE-AIR and my iPad looks getting DHCP address again while roaming...

Edit : not really stable solution, I lost my IP sometimes again !!