linux-kernel - Re: [PATCH v6 02/13] xen/pvcalls: implement frontend disconnect

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Message-ID: <0a050ea7-2062-8a2c-7929-629e105f218e@oracle.com>
Date:   Wed, 25 Oct 2017 09:49:54 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xen.org
Cc:     linux-kernel@...r.kernel.org, jgross@...e.com,
        Stefano Stabellini <stefano@...reto.com>
Subject: Re: [PATCH v6 02/13] xen/pvcalls: implement frontend disconnect

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 ;-(

-boris

> +
> +	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;
>  }
>