Re: ath10k to ath9k IBSS, ath9k has interface-combinations issue

[Ben Greear <greearb@candelatech.com>]

On 04/06/2015 10:17 PM, Janusz Dziedzic wrote:
> On 7 April 2015 at 07:12, Michal Kazior <michal.kazior@tieto.com> wrote:
>> 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.
>>
> 
> Check this discussion (ibss + p2p_device - this could be one you hit).
> http://www.spinics.net/lists/linux-wireless/msg134447.html

That patch is in my tree already, so must be something else.

Thanks,
Ben

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