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From: Daniel Drake <drake@endlessm.com>
Date: Fri, 10 Nov 2017 09:30:05 +0800
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Subject: Re: ath9k disconnects in 4.13 with reason=4 locally_generated=1
To: Jouni Malinen <jouni@qca.qualcomm.com>
Cc: "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
        ath9k-devel <ath9k-devel@qca.qualcomm.com>,
        Linux Upstreaming Team <linux@endlessm.com>
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On Fri, Nov 3, 2017 at 5:51 PM, Jouni Malinen <jouni@qca.qualcomm.com> wrote:
> On Fri, Nov 03, 2017 at 10:57:11AM +0800, Daniel Drake wrote:
>> Endless OS recently upgraded from Linux 4.11 to Linux 4.13, and we now
>> have a few reports of issues with ath9k wireless becoming unusable.
>>
>> In the logs we can see that it authenticates, associates and completes
>> the WPA 4 way handshake, before then being disconnected with:
>>
>>  wlp2s0: CTRL-EVENT-DISCONNECTED bssid=74:26:ac:68:2f:c0 reason=4
>> locally_generated=1
>
> reason=4 is WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY. I'd expect the most
> likely source of this to be one of the mac80211 code paths in mlme.c
> where disconnection is triggered if the current AP become unreachable.
> Getting a debug log from mac80211 might help in figuring out what is
> causing this (there seem to be number of mlme_dbg() calls before most,
> but not necessarily all, places where
> WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY is used).

We got the log, it is coming from ieee80211_sta_work()

        else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
            sdata_info(sdata,t
                 "Failed to send nullfunc to AP %pM after %dms,
disconnecting\n",
                 bssid, probe_wait_ms);
            ieee80211_sta_connection_lost(sdata, bssid,
                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);

I looked again at changes between 4.12 and 4.13 and still no idea how
4.13 causes this problem :(

Daniel