[Bug 198556] ath(4) channel 'any' not working correctly

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198556

            Bug ID: 198556
           Summary: ath(4) channel 'any' not working correctly
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: cmb at pfsense.org

When configuring ath(4) with channel any, the interface always ends up in
11b mode only on channel 6. 

ath0_wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
1500
        ether 00:80:48:79:99:f2
        inet6 fe80::280:48ff:fe79:99f2%ath0_wlan0 prefixlen 64 scopeid 0x9
        inet 100.70.0.1 netmask 0xffffff00 broadcast 100.70.0.255
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet autoselect mode 11b <hostap>
        status: running
        ssid APUtest channel 6 (2437 MHz 11b) bssid 00:80:48:79:99:f2
        country US ecm authmode WPA2/802.11i privacy MIXED deftxkey 2
        AES-CCM 2:128-bit AES-CCM 3:128-bit txpower 27 scanvalid 60 wme burst
        -apbridge dtimperiod 1 -dfs


If I configure any specific channel 1-11, and change nothing else, I
end up with b/g/n as expected.

ath0_wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
1500
        ether 00:80:48:79:99:f2
        inet6 fe80::280:48ff:fe79:99f2%ath0_wlan0 prefixlen 64 scopeid 0x9
        inet 100.70.0.1 netmask 0xffffff00 broadcast 100.70.0.255
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet autoselect mode 11ng <hostap>
        status: running
        ssid APUtest channel 1 (2412 MHz 11g ht/40+) bssid 00:80:48:79:99:f2
        country US ecm authmode WPA2/802.11i privacy MIXED deftxkey 2
        AES-CCM 2:128-bit txpower 27 scanvalid 60 protmode OFF ampdulimit 64k
        ampdudensity 8 shortgi wme burst -apbridge dtimperiod 1 -dfs

This has been verified on multiple systems in disparate locations with
different ath cards. At least two locations with significant 2.4 GHz noise (a
dozen up to a few dozen visible APs), and one location with minimal 2.4 GHz
noise, with the exact same results. 

The above is the circumstance with -CURRENT. This also doesn't work in FreeBSD
10.1, though with different symptoms. It's completely broken and gets stuck in
"no carrier" there with channel any. 

ath0_wlan0: flags=8c43<UP,BROADCAST,RUNNING,OACTIVE,SIMPLEX,MULTICAST>
metric 0 mtu 1500
        ether 00:80:48:79:99:f2
        inet6 fe80::280:48ff:fe79:99f2%ath0_wlan0 prefixlen 64 scopeid 0x9
        inet 100.64.0.1 netmask 0xffffff00 broadcast 100.64.0.255
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet autoselect mode 11ng
<hostap> (autoselect <hostap>)
        status: no carrier
        ssid asdfasfd channel 1 (2412 MHz 11b)
        country US ecm authmode WPA2/802.11i privacy MIXED deftxkey 3
        TKIP 2:128-bit TKIP 3:128-bit txpower 27 scanvalid 60 wme burst
        -apbridge dtimperiod 1 -dfs

I haven't tested anything other than ath(4) cards, so not sure if this is
specific to ath or net80211 in general.

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