From f7aeb6fb1a3d6b09623b169518314bc7869fffec Mon Sep 17 00:00:00 2001
From: Antonio Quartulli <antonio@open-mesh.com>
Date: Tue, 11 Jun 2013 14:20:00 +0200
Subject: [PATCH] mac80211: make mgmt_tx accept a NULL channel

cfg80211 passes a NULL channel to mgmt_tx if the frame has
to be sent on the one currently in use by the device.
Make the implementation of mgmt_tx correctly handle this
case. Fail if offchan is required.

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
[fix RCU locking]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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