Unable to remove kernel module showing permanent using lsmod

[sakthi selvam]

Dear All,

Need your assistance:

Currently I am using Wind River Linux distribution OS with kernel
version 2.6.27.39 and Wind River version pne-3. After loading of my
kernel module, I found it was permanent in the kernel using lsmod (for
ex see below Ref 1). When I tried to remove, it was displaying as
“ERROR: Removing 'hsl_module': Device or resource busy”. For your
information, the same module is working fine with the Wind River pne-2
Linux Distribution OS with kernel version 2.6.21.
>From the kernel source, I came to know that only possibility of
showing permanent is “if there is non-availability of cleanup_module
and with the availability of init_module”.

But in my case, cleanup module also available in memory, after loading
the module. I used to check using the file in /proc/kallsyms for the
availability of cleanup module in memory.

Thanks for reading. Prompt reply is expected to identify the root cause.

Ref 1:
Module                  Size  Used by
hsl_module            530454  0 [permanent]




Thanks,
Sakthi Selvam