Cannot bring up second VAP on recent kernels?

[Ben Greear <greearb@candelatech.com>]

Anyone successfully using more than one virtual AP on
3.3 or higher kernels?  It works fine for me on 3.0.32,
but my 3.3.8 and 3.5.7 kernels (and a few similar ones)
all fail with errors like this below:

Hardware is ath9k 3x3 9380 NIC.

[root@lec2010-ath9k-1 wifi]# cat hostapd_log_vap1.txt
1350936424.890962: random: Trying to read entropy from /dev/random
1350936424.891172: Configuration file: wifi/hostapd_vap1.conf
1350936424.892827: ctrl_interface_group=0
1350936424.895084: nl80211: interface vap1 in phy wiphy0
1350936424.895175: rfkill: initial event: idx=0 type=1 op=0 soft=0 hard=0
1350936424.895456: nl80211: Using driver-based off-channel TX
1350936424.895483: nl80211: TDLS supported
1350936424.895500: nl80211: TDLS external setup
1350936424.895612: nl80211: Add own interface ifindex 26
1350936424.896560: nl80211: Set mode ifindex 26 iftype 3 (AP)
1350936424.896919: nl80211: Setup AP - device_ap_sme=0 use_monitor=0
1350936424.896992: nl80211: Subscribe to mgmt frames with AP handle 0x81e8910
1350936424.897018: nl80211: Register frame type=0xb0 nl_handle=0x81e8910
1350936424.897036: nl80211: Register frame match - hexdump(len=0): [NULL]
1350936424.897107: nl80211: Register frame type=0x0 nl_handle=0x81e8910
1350936424.897127: nl80211: Register frame match - hexdump(len=0): [NULL]
1350936424.897174: nl80211: Register frame type=0x20 nl_handle=0x81e8910
1350936424.897195: nl80211: Register frame match - hexdump(len=0): [NULL]
1350936424.897240: nl80211: Register frame type=0xa0 nl_handle=0x81e8910
1350936424.897261: nl80211: Register frame match - hexdump(len=0): [NULL]
1350936424.897306: nl80211: Register frame type=0xc0 nl_handle=0x81e8910
1350936424.897326: nl80211: Register frame match - hexdump(len=0): [NULL]
1350936424.897372: nl80211: Register frame type=0xd0 nl_handle=0x81e8910
1350936424.897392: nl80211: Register frame match - hexdump(len=0): [NULL]
1350936424.897438: nl80211: Register frame type=0x40 nl_handle=0x81e8910
1350936424.897458: nl80211: Register frame match - hexdump(len=0): [NULL]
1350936424.897681: nl80211: Register beacons command failed: ret=-16 (Device or resource busy)
1350936424.897830: nl80211: Failed to set interface vap1 into AP mode
1350936424.901888: netlink: Operstate: linkmode=0, operstate=6
1350936424.901996: nl80211: Set mode ifindex 26 iftype 2 (STATION)
1350936424.902197: nl80211 driver initialization failed.


Thanks,
Ben


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com