Re: [PATCH 1/4] module: implement module_inhibit_unload()

[Tejun Heo <htejun@gmail.com>]

Tejun Heo wrote:
> Rusty Russell wrote:
>> Now, are you sure that calling cleanup_ccwgroup just after
>> device_unregister() works?
>>
>> static void __exit
>> cleanup_ccwgroup (void)
>> {
>> 	bus_unregister (&ccwgroup_bus_type);
>> }
> 
> It should.  After ->exit() is called, there can't be any object left
> behind.  If a module is hosting objects which can't be destroyed from
> ->exit(), its module ref count shouldn't be zero.  So, either 1.
> refcount != 0 or 2. ->exit() can destroy all objects.  As Cornelia
> explains, for ccwgroup, it's #1.  Note that unload inhibition doesn't
> change anything about this.

Hmmm.... There doesn't seem to any reason why the blocking should be
after calling ->exit().  And, yeah, it would be more useful and
intuitive if blocking happens before ->exit().  What do you think?

Thanks.

-- 
tejun