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    SubjectRe: [RFD driver-core] Lifetime problems of the current driver model
    Cornelia Huck wrote:
    > On Sat, 31 Mar 2007 12:12:48 +0900,
    > Tejun Heo <htejun@gmail.com> 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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