rmmod problem

["Raghu R. Arur" <rra2002@cs.columbia.edu>]

 Hi,

  I am intercepting the sys_read system call using this way ...


   orig_read = sys_call_table[__NR_read];
   sys_call_table[__NR_read] = my_read;

 inside init_module()

 and in my close_module I have this :

  
  sys_call_table[__NR_read] = orig_read;
  if(sys_call_table[__NR_read] == sys_read)
	{
	  printf("Everything is Ok");
	}


 i am just cross checking that the sys_call_table entries are properly 
restored.


 But when i do rmmod of this module it prints Everything is OK but after a 
few seconds the kernel hangs and I cannot type anything.


 Can anyone please help me in this regard.


 thanks a lot.

 raghu.

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