You can reload the wireless driver after suspend to avoid a reboot. My driver is 'ath9k' which you can find by running 'nm-tool' and look for the line similar to

Driver:   ath9k

Then to reload the driver:

sudo rmmod ath9k

sudo modprobe ath9k

To make this happen automatically when you come back from suspend we can add the following script at /etc/pm/sleep.d/00_wireless_sleep

#!/bin/sh



case "$1" in

  suspend|hibernate)

    /sbin/rmmod ath9k

    ;;

  resume|thaw)

    /sbin/rmmod ath9k

    /sbin/modprobe ath9k

    ;;

esac

exit 0

Replace the "ath9k" module name with the module you discovered from the nm-tool output mentioned above. I had to name the script "00_wireless_sleep" so it gets run after all the other resume scripts (scripts get run in reverse order on resume).
Don't forget to make file "00_wireless_sleep" executable:

sudo chmod 755 /etc/pm/sleep.d/00_wireless_sleep