From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Roskin <proski@gnu.org>
Date: Thu, 23 Jun 2011 17:20:05 -0400
Subject: [ath9k-devel] multiple virtual ad-hoc interfaces
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References: <20110623160612.hrbmnnq9j44wc4sc@webmail.inti.gob.ar>
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To: ath9k-devel@lists.ath9k.org

On 06/23/2011 03:06 PM, gtolon at inti.gob.ar wrote:
> Hi
>
> We are trying to use 2 virtual interfaces in ad-hoc mode using the iw
> utility and an atheros chipset 9285, but we can?t bring up both them.
> When we try with the second a "device or resource bussy" message
> appears. Thank you in advance.

This limitation is intentional.  The driver doesn't support more than 
one ad-hoc interface.  From drivers/net/wireless/ath/ath9k/main.c:

if ((ah->opmode == NL80211_IFTYPE_ADHOC) ||
     ((vif->type == NL80211_IFTYPE_ADHOC) &&
      sc->nvifs > 0)) {
         ath_err(common, "Cannot create ADHOC interface when other"
                 " interfaces already exist.\n");
         ret = -EINVAL;
         goto out;
}

-- 
Regards,
Pavel Roskin