That means that there's a bug in someone's driver.
For some reason, the function to decrement the module use is called more
than once when a controlling process releases use of a module. 
This will prevent you from being able to 'rmmod' or 'modprobe -r' it; a
"Device or resource busy" error or similar will result IIRC. 
Submit a bug to the driver maintainer.
 Kelsey Hudson                                           khudson@ctica.com 
 Software Engineer
 Compendium Technologies, Inc                               (619) 725-0771
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