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    SubjectRe: [RFD driver-core] Lifetime problems of the current driver model
    Cornelia Huck wrote:
    > On Fri, 30 Mar 2007 18:43:02 +0900,
    > Tejun Heo <htejun@gmail.com> wrote:
    >
    >> One way to solve this problem is to subordinate lifetime rule #b to
    >> rule #c. Each kobject points to its owning module such that grabbing
    >> a kobject automatically grabs the module. The problem with this
    >> approach is that it requires wide update and makes kobject_get
    >> heavier.
    >
    > Shouldn't getting/putting the module refcount be solely done in
    > kobject.c? Grab the module reference when the kobject is created and
    > release the module reference in kobject_cleanup() after the release
    > function has been called. This doesn't make kobject_get() heavier, and
    > it ensures we don't delete the module until after the last kobject it is
    > supposed to clean up has been released.

    If we do that, we wouldn't be able to unload a module if there is any
    kobject referencing it even when the node has no openers, so no easy way
    out there. :-(

    --
    tejun
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