Re: [PATCH BlueZ 08/12] Drop GAttrib ref if callback list is empty

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Hi Lizardo,

On Thu, Jul 14, 2011, Anderson Lizardo wrote:
> On Thu, Jul 14, 2011 at 10:44 AM, Johan Hedberg <johan.hedberg@xxxxxxxxx> wrote:
> >> @@ -2605,10 +2605,15 @@ gboolean btd_device_remove_attio_callback(struct btd_device *device, guint id)
> >>
> >>       g_free(attio);
> >>
> >> +     if (device->attios != NULL)
> >> +             return TRUE;
> >> +
> >>       if (device->attioid) {
> >>               g_source_remove(device->attioid);
> >>               device->attioid = 0;
> >>       }
> >>
> >> +     g_attrib_unref(device->attrib);
> >> +
> >>       return TRUE;
> >>  }
> >
> > Looks like you're missing a device->attrib = NULL; after the unref.
> 
> I really don't see the point in setting a reference counted variable
> to NULL. How would we know whether this is the last usage or not?

You're not supposed to know. All you know is that device->attrib is one
reference to the GAttrib object. Calling unref is akin to saying "this
pointer is no longer valid" and since the btd_device object keeps living
after this function you should set the ->attrib pointer to NULL after
dropping this reference.

Johan
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