Roaming problem

[Anshuman Singh Rawat]

Hi all!  
We here are trying to modify the hostap  
driver a bit, so that it does automatic  
romaing (controlled by our driver) when in  
host_roaming mode 2 (manual roam).  
  
We use a threshold value of signal strength  
to make a decision about when to perform a  
handoff.  
  
The problem is that sometimes while  
performing an active scan, we see a lot of  
"trash" being printed (when we run dmesg).   
  
------------------------------------------  
wlan0: LinkStatus: BSSID=00:20:a6:4d:1e:39  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
   A1=00:20:a6:4d:1e:39  
A2=00:06:25:17:8c:50 A3=00:d0:06:26:9c:0a  
A4=00:00:00:00:00:00  
wlan0: TXEXC - status=0x0004 ([Discon])  
tx_control=000c  
   retry_count=0 tx_rate=0 fc=0x0108  
(Data::0 ToDS)  
  
Any pointers on why this happens, would be  
really appreciated.  
  
Thanks.