[Bug 540827] [NEW] ar9170usb wifi module crash + instabile connection

[prygme]

Public bug reported:

ar9170usb kernel module is crashing when used for TP-link TL-WN821N usb wifi card.
If I remove it then it causes system crash, kernel panic.
The bigger problem is: wifi net connection is very unstable. Losing connection in every few minutes. 
  Connection speed is low, less than 100 kbps, many ip packages are lost. 
  Sometimes strange ssid is shown for AP with strange characters. In this case it can't connect of course.

This problems was detected, then TP-link  TL-WN821N was connected to a Belkin 54g access point. (WPA-PSK TKIP)
However there is no problem when it connects to La Fonera fon2100a (WPA2-PSK AES).

There is no any problem to connect to same Belkin 54g AP on Windows,
from same computer and same TP-link TL-WN82N.

The lshw output for this wifi device is:

  *-network
       description: Wireless interface
       physical id: 1
       logical name: wlan0
       serial: 00:25:86:e5:52:c9
       capabilities: ethernet physical wireless
       configuration: broadcast=yes ip=192.168.2.4 multicast=yes wireless=IEEE 802.11bg

TP-Link  TL-WN821N is supported since kernel 2.6.31-19 (Karmic Koala), according to this wiki page:
https://help.ubuntu.com/community/HardwareSupportComponentsWirelessNetworkCardsTP-Link#USB

uname -a :
Linux szaturnusz 2.6.32-16-generic-pae #25-Ubuntu SMP Tue Mar 9 18:03:39 UTC 2010 i686 GNU/Linux
cat /proc/version_signature :
Ubuntu 2.6.32-16.25-generic-pae

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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ar9170usb wifi module crash + instabile connection
https://bugs.launchpad.net/bugs/540827
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