On Tuesday, October 30, 2012 08:50:41 AM Greg KH wrote:
> On Mon, Oct 29, 2012 at 10:01:52PM -0700, Dmitry Torokhov wrote:
> > On Mon, Oct 29, 2012 at 07:26:05PM -0700, Greg KH wrote:
> > > On Mon, Oct 29, 2012 at 06:04:27PM -0700, George Zhang wrote:
> > > > +static void event_signal_destroy(struct kref *kref)
> > > > +{
> > > > + struct vmci_subscription *entry =
> > > > + container_of(kref, struct vmci_subscription,
> > > > kref);
> > > > +
> > > > + complete(&entry->done);
> > > > +}
> > >
> > > Didn't you just leak memory here? What frees the structure up?
> >
> > event_unregister_subscription() waits for that completion and frees the
> > structure. We want event_unregister_subscription() to wait until all
> > fired callbacks completed before unregister is complete.
>
> So all calls to this can just sit and spin waiting for others to clean
> up? Odd, but ok.
Not all as there is logically only one owner of the subscription so
naturally it waits until all notification callbacks are done.
Frankly we have a change that gets rid of delayed ecvent callbacks
and so the refcounting is no longer needed at all.
Thanks,
Dmitry
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