Blacklist brcm* drivers from preload-wifi-driver

udev-addon.conf

 # Copyright (c) 2011 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.
 
 description     "Trigger udev events"
 author          "chromium-os-dev@chromium.org"
 
 # We must run eventually even if the UI doesn't come up correctly,
 # because network configuration depends on this job.
 start on starting failsafe
@@ skipping 15 matching lines @@
 
   if [ -n "$drv" ] ; then
     drvmod=$(lsmod | awk 'd==$1 { print $1 }' d="$drv")
   fi
 
   if [ -n "$drvmod" ] ; then
     if [ -s $drvfile ] ; then
       olddrv=$(head -1 $drvfile)
     fi
 
+    # Blacklist brcm drivers
+    # TODO: investigate true cause of the problem and remove blacklist
+    if [ "$(echo $drv | head -c4)" = "brcm" ] ; then
+      rm -f $drvfile
     # Only update contents if they've changed.
-    if [ "$drv" != "$olddrv" ] ; then
+    elif [ "$drv" != "$olddrv" ] ; then
       echo "$drv" > $drvfile
     fi
   else
     logger "udev-addon:$iwdev: $drv is not a module."
   fi
 end script