Re: [RFD driver-core] Lifetime problems of the current driver model

[Tejun Heo]

Cornelia Huck wrote:
> On Sat, 31 Mar 2007 12:12:48 +0900,
> Tejun Heo <htejun@xxxxxxxxx> wrote:
>
> > > Hm, but as long as dk0 is registered, it can be looked up and someone
> > > could get a reference on it.
> > Yeah, exactly.  That's why any getting any kobject reference backed by a
> > module must be accompanied by try_module_get().
> >
> > int mydrv_get_dk(struct dk *dk)
> > {
> > 	rc = try_module_get(mydrv);
> > 	if (rc)
> > 		return rc;
> > 	kobject_get(&dk->kobj);
> > 	return 0;
> > }
>
> This works if the caller always knows which module to grab (I was
> thinking about some tree-walking code).

Yeah, that's why we have so many ->owner's and getting it wrong results 
in jumping to non-existent address.

--
tejun
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