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From: Sujith Manoharan <sujith@msujith.org>
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Date: Wed, 17 Sep 2014 10:24:45 +0530
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>,
	linux-wireless@vger.kernel.org
Subject: Re: [PATCH] mac80211: Call mgd_prepare_tx before deauthentication
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Sujith Manoharan wrote:
> From: Sujith Manoharan <c_manoha@qca.qualcomm.com>
> 
> With drivers that support multi-channel concurrency,
> make sure that the correct context is in use before
> sending a deauth frame. The driver could be in a different
> context, in which case the frame could be dropped.

The behavior appears to have been changed in:

commit 8c7d857c4a4a552d8d3e1b2e24e1864ec2989285
Author: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Date:   Wed Jul 25 01:42:36 2012 +0300

    mac80211: don't call mgd_prepare_tx when associated


I am not sure how it can be guaranteed that the driver is
on the right context when trying to send a mgmt frame.
ath9k uses mgd_prepare_tx() to switch to the required context,
so I think this call is necessary even if we are associated.

Sujith