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    SubjectRe: PATCH: (as177) Add class_device_unregister_wait() and platform_device_unregister_wait() to the driver model core
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    On Mon, 26 Jan 2004 15:06:48 +1000, Steve Youngs <sryoungs@bigpond.net.au>  said:

    > > A boolean is just a one-bit reference count. If the maximum number of
    > > simultaneous 'users' for a given module is one, then a boolean will work.
    > > If there is potential for more than one simultaneous user then you need
    > > more bits.
    >
    > Why? A module is either being used or it isn't, the number of uses
    > shouldn't even come into it.

    OK. There's 2 users of the module. The first one exits. How does it (or
    anything else) know that it's NOT safe to just clear the in-use bit and clean
    it up?

    And how does the second one know it IS safe to clean up?
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