Re: kernel module event handler question

["Thomas E. Spanjaard" <tgen@xxxxxxxxxxxxx>]

YONETANI Tomokazu wrote:
> If the event handler in a kernel module returns an error upon registration,
> isn't the module supposed to be removed from the kldstat's list?
>
> I wrote a simple kernel module(attached) which always returns EOPNOTSUPP
> for MOD_LOAD event.  It adds two sysctl nodes debug.test and debug.test_int.
> Reading from or writing to debug.test calls test_sysctl_proc() function.
> When loaded, although module_register_init prints an error message, the
> modules sits there, and I can even set different values to debug.test.
>
> Is this an expected behavior?  Do I need to do something special to
> unregister my kernel module when something went wrong?

I guess the reference count of the module is still >0. in 
module_register_init(), mod_release() is called on the module if an 
error occurred, but it seems the reference count is still >0 after the 
call. This seems wrong, since a module which fails loading can never be 
useful. Also, you do see the 'kldunload'ing OK' printf()? And the error 
from module_register_init()?

Cheers,
--
        Thomas E. Spanjaard
        tgen@xxxxxxxxxxxxx

Attachment: signature.asc
Description: OpenPGP digital signature