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Date: Tue, 7 Apr 2015 07:12:23 +0200
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Subject: Re: ath10k to ath9k IBSS, ath9k has interface-combinations issue
From: Michal Kazior <michal.kazior@tieto.com>
To: Ben Greear <greearb@candelatech.com>
Cc: "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
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Sender: linux-wireless-owner@vger.kernel.org

On 7 April 2015 at 02:39, Ben Greear <greearb@candelatech.com> wrote:
> Has anyone tried running ath10k to ath9k IBSS?
>
> I'm trying this with a somewhat hacked 4.0-rc6 kernel,
> and latest wpa_supplicant.
>
> ath9k to ath9k works with and without encryption, and ath10k to ath10k works
> (w/out encryption at least).
>
> But, if I try to tell ath10k to connect to ath9k, then the ath9k reports
> interface combinations
> issues and will not associate.  I've added some debug, and the issue is the
> 'num==0' part here:
>
>
> int cfg80211_check_combinations(struct wiphy *wiphy,
>                                 const int num_different_channels,
>                                 const u8 radar_detect,
>                                 const int iftype_num[NUM_NL80211_IFTYPES])
> {
>         int err, num = 0;
>
>         err = cfg80211_iter_combinations(wiphy, num_different_channels,
>                                          radar_detect, iftype_num,
>                                          cfg80211_iter_sum_ifcombs, &num);
>         if (err) {
>                 pr_info("cfg-comb-check: failed to iterate combinations\n");
>                 return err;
>         }
>         if (num == 0) {
>                 pr_info("cfg-comb-check: iter-combinations returned
> num==0\n");
>                 return -EBUSY;
>         }
>
>         return 0;
> }
> EXPORT_SYMBOL(cfg80211_check_combinations);
>
> There should be exactly one interface on this radio that is admin-up, and it
> is the
> one that I am trying to make run in adhoc mode.
>
> Any ideas on this?

IBSS with non-fixed or dfs channel? It would bump
num_different_channels and yield no valid combinations. But why would
that work fine with, e.g. ath9k-ath9k otherwise - no idea.


Michał