> i am developing a module related to filesystem. My problem is this works > on my machine, but its not working on another machine with different > hardaware configuration. > > Module Details: > in the module i used get_sb_nodev(), to get a super block, and using it i > traversed through list of super blocks and terminated the loop when i got > required super block(vfat). So it prints list of super blocks until required > and then terminates. This code is implemented without using list_head. > I checked your code. I think you cannot use the list_head pointers directly as a super_block pointer. You should use something like list_entry()/container_of() to convert the list_head pointer to the my_sb super_block pointer. Or better still, stick to list_for_each() and list_entry(). That is why you got the null pointer exception. why it is working on the other machines, I cannot say. -- Goldwyn -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
