[Bug 207445] net80211 Atheros AR938x: non-working WiFi hostap since ~ January

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207445

            Bug ID: 207445
           Summary: net80211 Atheros AR938x: non-working WiFi hostap since
                    ~ January
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: ohartman at zedat.fu-berlin.de
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Running CURRENT (FreeBSD 11.0-CURRENT #15 r295926: Tue Feb 23 17:20:59 CET
2016) with a TP-Link PCIe WiFi adaptor TP-Link TL-WDN4800 N900 based on
Qualcomm Atheros AR938x chipset. I used this adaptor as AccessPoint with
CURRENT successfully over Christmas 2015 using both laptops and smartphone
WiFi. This doesn't work anymore since ~ mid-January after updating the system's
world and kernel.

I haven't found out what the exact reason is, but as far as I can describe is
that the client still receives its IP via DHCP (isc-dhcp43-server-4.3.3P1_1   
net/isc-dhcp43-server). Then authetication (via hostapd) fails.

root at gkommadoluch [~] dmesg|grep ath0
ath0: <Atheros AR938x> mem 0xf7e00000-0xf7e1ffff irq 16 at device 0.0 on pci1
ath0: [HT] enabling HT modes
ath0: [HT] enabling short-GI in 20MHz mode
ath0: [HT] 1 stream STBC receive enabled
ath0: [HT] 1 stream STBC transmit enabled
ath0: [HT] 3 RX streams; 3 TX streams
ath0: AR9380 mac 448.3 RF5110 phy 0.0
ath0: 2GHz radio: 0x0000; 5GHz radio: 0x0000
ath0: stuck beacon; resetting (bmiss count 4)


pciconf -lvbce
[...]
ath0 at pci0:1:0:0:        class=0x028000 card=0x3112168c chip=0x0030168c rev=0x01
hdr=0x00
    vendor     = 'Qualcomm Atheros'
    device     = 'AR93xx Wireless Network Adapter'
    class      = network
    bar   [10] = type Memory, range 64, base 0xf7e00000, size 131072, enabled
    cap 01[40] = powerspec 3  supports D0 D1 D3  current D0
    cap 05[50] = MSI supports 4 messages, 64 bit, vector masks 
    cap 10[70] = PCI-Express 2 endpoint max data 128(128) link x1(x1)
                 speed 2.5(2.5) ASPM disabled(L0s/L1)
    ecap 0001[100] = AER 1 0 fatal 0 non-fatal 0 corrected
    ecap 0002[140] = VC 1 max VC0
    ecap 0003[300] = Serial 1 0000000000000000

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