netdev - SIOCSIWFREQ while in NL80211_IFTYPE

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Date:   Thu, 5 Jan 2017 12:02:19 +0100
From:   Jorge Ramirez <jorge.ramirez-ortiz@...aro.org>
To:     netdev@...r.kernel.org, Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: SIOCSIWFREQ while in NL80211_IFTYPE_STATION

Hello all,

I am running a single wlan0 interface in managed mode (no aliases, no 
other wireless interfaces).
The association with the AP still hasn't happened.

I noticed that if trying to change the frequency to one of the valid 
values, the driver returns EBUSY.

The call stack is
cfg80211_wext_siwfreq
-->cfg80211_mgd_wext_siwfreq
--->cfg80211_set_monitor_channel (notice call to set 'monitor' channel 
in managed mode)
----> fails with EBUSY

Is therefore the expected behavior to fail under the above circumstances 
(managed mode && single wlan0 interface && no association)?
And if it is, please could you clarify when would it be valid to change 
the frequency in managed mode?

many thanks in advance for the help,
Jorge