wpa_supplicant roaming not working if nl80211 driver is used

[Holger Schurig]

>  The wpa_supplicant always failed to roam. NL80211 has a
>  NL80211_CMD_ROAM > command but it is implemented yet. We can work
>  around this by dissociating from previous AP but it not roaming..
> 
>  Do you have any idea?

wpa_supplicant should simply call the nl80211-disconnect command before 
calling the connect command. That will make devices with cfg80211 and 
connect/disconnect commands (libertas, orinoco, etc) happy.

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