On Thu, Oct 12, 2017 at 04:52:32PM -0500, Brijesh Singh wrote: > See my above comment, I think the simplest solution is remove psp->sev_misc Ok, so far so good. But now you still need to track which is the last psp device and to call misc_deregister() only when the last device exits. Because if you do that for the first psp device as it is now, all the following devices will see a deregistered misc device. And I don't think we want that. You probably could do something with reference counting: Documentation/kref.txt to track that and have the last device deregister the misc device. Or have the "enclosing" sp-dev deregister the misc device when it is exiting and when it is sure that there are no more psp devices... -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --