module using another module

[Jason Nymble]

What is the correct/recommended way for one module to "plug in to" or  
use another module? e.g. if I have one module (call it A) which  
exports a symbol allowing a different module (call it B) to register  
(and unregister) a function pointer (which gets called by A if it has  
a valid value), it would be very good if A cannot unload while B is  
using it (registered), and also that B can unload without A being  
aware it has unregistered. The latter can simply be achieved by having  
B call the unregister function of A when it unloads. The former I  
suppose could be done via some sort of refcount scheme, but I'm sure  
this type of problem has a proper correct solution in the Linux kernel  
(e.g. all the modules that use the i2c module etc. etc.), and I'd  
obviously like to avoid re-inventing the wheel (badly).

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