Use count in open/close device driver

[yong rao]

We want to have use count in the dev_open(), dev_close() functions. Just like
in Linux, in open_dev() function we counld have 

  #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
        MOD_INC_USE_COUNT;
  #endif

  #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
   try_module_get(THIS_MODULE);    /* increment the usage counter */
 #endif

to increment the use count. In close_dev(), we could decrement the use
count.

So, when the device driver is unloaded, we would be able to know if there is
any other application processes is still using the driver.

Is there anybody having any clues?

Thanks a lot,

Yong Rao

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