What happens when you roam from network A to network B with this patch
applied? Or an intermittent loss or re - connection to any network?

When leaving a network, wpa_cli daemon will invoke wpa_action after recieving 
the disconnected signal via the control socket: 
`wpa_action $IFACE DISCONNECTED'

wpa_action will then call ifdown:
`ifdown $IFACE'

At this point, the code from the above patch will then terminate the
wpa_* daemons, via wpa_action, due to the logical mapping having a `wpa-
roam slave' line in its stanza. Network B is now out of reach, or your
connection is lost if you experience a DISCONNECTED event for whatever
reason.

Please correct me if wrong.

Thanks, Kel.

-- 
ifupdown script fails to terminate wpasupplicant
https://launchpad.net/bugs/72152

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