From owner-freebsd-net@FreeBSD.ORG  Wed Feb  1 18:18:32 2006
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Date: Wed, 01 Feb 2006 13:18:31 -0500
To: freebsd-net@freebsd.org
From: Dan Swartzendruber <dswartz@druber.com>
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Subject: 'ifconfig ath0 scan' hangs under 6.0-STABLE (resolved?)
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Poking through ieee80211_ioctl.c in the kernel, I see this:

         case IEEE80211_IOC_SCAN_REQ:
                 if (ic->ic_opmode == IEEE80211_M_HOSTAP)        /* 
XXX ignore */
                         break;
                 error = ieee80211_setupscan(ic, ic->ic_chan_avail);
                 if (error == 0)         /* XXX background scan */
                         error = ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
                 break;

So, it looks like if you're in hostap mode, it just ignores the 
request?  Unfortunately, the ifconfig code is looping waiting for a 
response.    Oh well...