Re: [Xen-devel] [PATCH v6 02/13] xen/pvcalls: implement frontend disconnect

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 25 Oct 2017, Boris Ostrovsky wrote:
> On 10/24/2017 01:33 PM, Stefano Stabellini wrote:
> > +static void pvcalls_front_free_map(struct pvcalls_bedata *bedata,
> > +                              struct sock_mapping *map, bool locked)
> > +{
> > +}
> > +
> >  static const struct xenbus_device_id pvcalls_front_ids[] = {
> >     { "pvcalls" },
> >     { "" }
> > @@ -27,6 +66,32 @@
> >  
> >  static int pvcalls_front_remove(struct xenbus_device *dev)
> >  {
> > +   struct pvcalls_bedata *bedata;
> > +   struct sock_mapping *map = NULL, *n;
> 
> Your last comment made me look again at sock_mapping definition. And
> then I noticed that it is not defined until patch 4 ;-(

I moved the definition of struct sock_mapping to this patch. Then, I
tested the build patch by patch. I also had to move a few #includes from
patch #5 to #4, but everything builds fine now.


> > +
> > +   bedata = dev_get_drvdata(&pvcalls_front_dev->dev);
> > +   dev_set_drvdata(&dev->dev, NULL);
> > +   pvcalls_front_dev = NULL;
> > +   if (bedata->irq >= 0)
> > +           unbind_from_irqhandler(bedata->irq, dev);
> > +
> > +   smp_mb();
> > +   while (atomic_read(&pvcalls_refcount) > 0)
> > +           cpu_relax();
> > +   list_for_each_entry_safe(map, n, &bedata->socket_mappings, list) {
> > +           if (map->active_socket) {
> > +                   /* No need to lock, refcount is 0 */
> > +                   pvcalls_front_free_map(bedata, map, true);
> > +           } else {
> > +                   list_del(&map->list);
> > +                   kfree(map);
> > +           }
> > +   }
> > +   if (bedata->ref >= 0)
> > +           gnttab_end_foreign_access(bedata->ref, 0, 0);
> > +   kfree(bedata->ring.sring);
> > +   kfree(bedata);
> > +   xenbus_switch_state(dev, XenbusStateClosed);
> >     return 0;
> >  }
> >  
> 

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