Hi, manish rangankar wrote: > Now, when i access the OPEN this node multiple times it's count > should be increase... Which kernel version are you using ? AFAIK, in 2.4.x, one had to call MOD_INC_USE_COUNT in the open() method of the character driver. But in 2.6.x, I think this is done automagically. Isn't it ? Maybe you should have a look at Linux Device Drivers, the 3rd edition is available online. Sincerly, Thomas -- Thomas Petazzoni thomas.petazzoni@xxxxxxxx -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/