[dm-devel] [PATCH] kobject: provide kobject_put_wait to fix module unload race

[Mikulas Patocka]

On Sun, 5 Jan 2014, Bart Van Assche wrote:

> On 01/04/14 19:06, Mikulas Patocka wrote:
> > -	if (t && !t->release)
> > -		pr_debug("kobject: '%s' (%p): does not have a release() "
> > -			 "function, it is broken and must be fixed.\n",
> > -			 kobject_name(kobj), kobj);
> > -
> 
> Has it been considered to issue a warning if no release function has
> been defined and free_completion == NULL instead of removing the above
> debug message entirely ? I think even with this patch applied it is
> still wrong to invoke kobject_put() on an object without defining a
> release function.
> 
> Thanks,
> 
> Bart.

With the above patch, you don't need the release method for correct 
behavior. Therefore you don't have to issue warning when it is missing.

Mikulas