A simple watchdog daemon that checks for wpa_supplicant attempting to reestablish the connection and temporarily removes wlan0 from the bridge it is connected to.

wlan-watchdog

#!/bin/sh
# wlan-watchdog -- a simple watchdog daemon that checks for wpa_supplicant
# attempting to reestablish the connection and temporarily removes wlan0 from
# the bridge.
#
# Copyright 2013 Chow Loong Jin <hyperair@debian.org>
# Licensed under WTFPL
#
# This is a workaround for a weird bug in iwl4965 where wpa_supplicant is not
# able to complete authentication when attached to a bridge, with error messages
# that look like:
# wpa_supplicant: CTRL-EVENT-DISCONNECTED bssid=aa:bb:cc:dd:ee:ff reason=2

while true; do
    while wpa_cli status verbose | grep -q wpa_state=COMPLETED; do
        sleep 1
    done

    echo "wlan0 is trying to connect, remove from bridge..."
    brctl delif br0 wlan0
    until wpa_cli status verbose | grep -q wpa_state=COMPLETED; do
        sleep 1
    done

    echo "wlan0 is connected! Add back to bridge.."
    brctl addif br0 wlan0
done