Re: CVS commit: src/sys/net80211

[Atsushi Onoe <onoe%sm.sony.co.jp@localhost>]

> I made the change for a reason: it makes the ieee80211_node track changes
> of SSID during a scan (see net/if_ieee80211subr.c rev 1.39). Now it will

> How do we track SSID changes and still accomodate hidden APs?

Upon every timeout of each scan, there will be 3 possibilities in
ieee80211_end_scan():
- No candidate found because we didn't catch the change of the SSID.
        all node table are flushed, so the node table is re-constructed.
- The node is selected but the SSID is already changed.
        association will be failed, and the AP is marked as unavailable.
- Other node is selected.
        we are happy anyway.

According to the Adhoc station, there will be another issues:
- Failed to find other station and we start another IBSS.
        But this is very transient problem, so we will encounter the
        same problem regardless the change.

Perhaps we need special handling in IBSS mode, to perform IBSS merge,
i.e. two BSS with same SSID should be merged into single BSS.

Atsushi Onoe