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    SubjectRe: kernel threads and close method in a device driver
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    > What can cause a close not to get invoked?  BTW, the close is returning
    > with a 0 status to the application ...(it definitely did NOT
    > get invoked in the driver)

    The driver release function is invoked when the use count of the handle hits
    zero. Make sure you are not muddling release and flush ?
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