Default to 802.11g instead of 802.11b when hw_mode is not specified.

server/site_linux_router.py

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import re
 
 def isLinuxRouter(router):
     router_uname = router.run('uname').stdout
     return re.search('Linux', router_uname)
 
@@ skipping 41 matching lines @@
 
         # hostapd configuration persists throughout the test, subsequent
         # 'config' commands only modify it.
         self.hostapd = {
             'configured': False,
             'file': "/tmp/%s.conf" % self.phydev,
             'driver': "nl80211",
             'conf': {
                 'ssid': defssid,
                 'interface': self.wlanif,
-                'bridge': self.bridgeif
+                'bridge': self.bridgeif,
+                'hw_mode': 'g'
             }
         }
 
         # Kill hostapd if already running.
         self.router.run("pkill hostapd >/dev/null 2>&1", ignore_status=True)
 
         # Remove all bridges.
         output = self.router.run("%s show" % self.cmd_brctl).stdout
         test = re.compile("^(\S+).*")
         for line in output.splitlines()[1:]:
@@ skipping 66 matching lines @@
             for k, v in params.iteritems():
                 if k == 'ssid':
                     conf['ssid'] = v
                 elif k == 'channel':
                     freq = int(v)
 
                     # 2.4GHz
                     if freq <= 2484:
                         # Make sure hw_mode is set
                         if conf.get('hw_mode') == 'a':
-                            conf['hw_mode'] = 'b'
+                            conf['hw_mode'] = 'g'
                        
                         # Freq = 5 * chan + 2407, except channel 14
                         if freq == 2484:
                             conf['channel'] = 14
                         else:
                             conf['channel'] = (freq - 2407) / 5
                     # 5GHz
                     else:
                         # Make sure hw_mode is set
                         conf['hw_mode'] = 'a'
@@ skipping 111 matching lines @@
         self.router.run("pkill hostapd >/dev/null 2>&1", ignore_status=True)
 #        self.router.run("rm -f %s" % self.hostapd['file'])
 
         # Tear down the bridge.
         self.router.run("%s link set %s down" % (self.cmd_ip, self.bridgeif),
             ignore_status=True)
         self.router.run("%s delbr %s" % (self.cmd_brctl, self.bridgeif),
             ignore_status=True)
 
         self.hostapd['configured'] = False