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Date: Mon, 27 Jun 2011 09:44:31 +0100
From: Ian Campbell <Ian.Campbell@...rix.com>
To: Bastian Blank <waldi@...ian.org>,
Jeremy Fitzhardinge <jeremy@...p.org>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC: "xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 1/2] xen: Populate xenbus device attributes
On Fri, 2011-06-24 at 22:51 +0100, Bastian Blank wrote:
> The xenbus bus type uses device_create_file to assign all used device
> attributes. However it does not remove them when the device goes away.
Doesn't the cleanup happen automatically in the device core when the
device goes away? Either way this is a good cleanup in its own right.
> This patch uses the dev_attrs field of the bus type to specify default
> attributes for all devices.
>
> Signed-off-by: Bastian Blank <waldi@...ian.org>
Acked-by: Ian Campbell <ian.campbell@...rix.com>
Thanks Bastian.
Ian.
> ---
> drivers/xen/xenbus/xenbus_probe.c | 41 +++++++++------------------
> drivers/xen/xenbus/xenbus_probe.h | 2 +
> drivers/xen/xenbus/xenbus_probe_backend.c | 6 +---
> drivers/xen/xenbus/xenbus_probe_frontend.c | 6 +---
> 4 files changed, 18 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
> index 7397695..2ed0b04 100644
> --- a/drivers/xen/xenbus/xenbus_probe.c
> +++ b/drivers/xen/xenbus/xenbus_probe.c
> @@ -378,26 +378,31 @@ static void xenbus_dev_release(struct device *dev)
> kfree(to_xenbus_device(dev));
> }
>
> -static ssize_t xendev_show_nodename(struct device *dev,
> - struct device_attribute *attr, char *buf)
> +static ssize_t nodename_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> {
> return sprintf(buf, "%s\n", to_xenbus_device(dev)->nodename);
> }
> -static DEVICE_ATTR(nodename, S_IRUSR | S_IRGRP | S_IROTH, xendev_show_nodename, NULL);
>
> -static ssize_t xendev_show_devtype(struct device *dev,
> - struct device_attribute *attr, char *buf)
> +static ssize_t devtype_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> {
> return sprintf(buf, "%s\n", to_xenbus_device(dev)->devicetype);
> }
> -static DEVICE_ATTR(devtype, S_IRUSR | S_IRGRP | S_IROTH, xendev_show_devtype, NULL);
>
> -static ssize_t xendev_show_modalias(struct device *dev,
> - struct device_attribute *attr, char *buf)
> +static ssize_t modalias_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> {
> return sprintf(buf, "xen:%s\n", to_xenbus_device(dev)->devicetype);
> }
> -static DEVICE_ATTR(modalias, S_IRUSR | S_IRGRP | S_IROTH, xendev_show_modalias, NULL);
> +
> +struct device_attribute xenbus_dev_attrs[] = {
> + __ATTR_RO(nodename),
> + __ATTR_RO(devtype),
> + __ATTR_RO(modalias),
> + __ATTR_NULL
> +};
> +EXPORT_SYMBOL_GPL(xenbus_dev_attrs);
>
> int xenbus_probe_node(struct xen_bus_type *bus,
> const char *type,
> @@ -449,25 +454,7 @@ int xenbus_probe_node(struct xen_bus_type *bus,
> if (err)
> goto fail;
>
> - err = device_create_file(&xendev->dev, &dev_attr_nodename);
> - if (err)
> - goto fail_unregister;
> -
> - err = device_create_file(&xendev->dev, &dev_attr_devtype);
> - if (err)
> - goto fail_remove_nodename;
> -
> - err = device_create_file(&xendev->dev, &dev_attr_modalias);
> - if (err)
> - goto fail_remove_devtype;
> -
> return 0;
> -fail_remove_devtype:
> - device_remove_file(&xendev->dev, &dev_attr_devtype);
> -fail_remove_nodename:
> - device_remove_file(&xendev->dev, &dev_attr_nodename);
> -fail_unregister:
> - device_unregister(&xendev->dev);
> fail:
> kfree(xendev);
> return err;
> diff --git a/drivers/xen/xenbus/xenbus_probe.h b/drivers/xen/xenbus/xenbus_probe.h
> index 888b990..b814935 100644
> --- a/drivers/xen/xenbus/xenbus_probe.h
> +++ b/drivers/xen/xenbus/xenbus_probe.h
> @@ -48,6 +48,8 @@ struct xen_bus_type
> struct bus_type bus;
> };
>
> +extern struct device_attribute xenbus_dev_attrs[];
> +
> extern int xenbus_match(struct device *_dev, struct device_driver *_drv);
> extern int xenbus_dev_probe(struct device *_dev);
> extern int xenbus_dev_remove(struct device *_dev);
> diff --git a/drivers/xen/xenbus/xenbus_probe_backend.c b/drivers/xen/xenbus/xenbus_probe_backend.c
> index 6cf467b..ec510e5 100644
> --- a/drivers/xen/xenbus/xenbus_probe_backend.c
> +++ b/drivers/xen/xenbus/xenbus_probe_backend.c
> @@ -183,10 +183,6 @@ static void frontend_changed(struct xenbus_watch *watch,
> xenbus_otherend_changed(watch, vec, len, 0);
> }
>
> -static struct device_attribute xenbus_backend_dev_attrs[] = {
> - __ATTR_NULL
> -};
> -
> static struct xen_bus_type xenbus_backend = {
> .root = "backend",
> .levels = 3, /* backend/type/<frontend>/<id> */
> @@ -200,7 +196,7 @@ static struct xen_bus_type xenbus_backend = {
> .probe = xenbus_dev_probe,
> .remove = xenbus_dev_remove,
> .shutdown = xenbus_dev_shutdown,
> - .dev_attrs = xenbus_backend_dev_attrs,
> + .dev_attrs = xenbus_dev_attrs,
> },
> };
>
> diff --git a/drivers/xen/xenbus/xenbus_probe_frontend.c b/drivers/xen/xenbus/xenbus_probe_frontend.c
> index b6a2690..ed2ba47 100644
> --- a/drivers/xen/xenbus/xenbus_probe_frontend.c
> +++ b/drivers/xen/xenbus/xenbus_probe_frontend.c
> @@ -81,10 +81,6 @@ static void backend_changed(struct xenbus_watch *watch,
> xenbus_otherend_changed(watch, vec, len, 1);
> }
>
> -static struct device_attribute xenbus_frontend_dev_attrs[] = {
> - __ATTR_NULL
> -};
> -
> static const struct dev_pm_ops xenbus_pm_ops = {
> .suspend = xenbus_dev_suspend,
> .resume = xenbus_dev_resume,
> @@ -106,7 +102,7 @@ static struct xen_bus_type xenbus_frontend = {
> .probe = xenbus_dev_probe,
> .remove = xenbus_dev_remove,
> .shutdown = xenbus_dev_shutdown,
> - .dev_attrs = xenbus_frontend_dev_attrs,
> + .dev_attrs = xenbus_dev_attrs,
>
> .pm = &xenbus_pm_ops,
> },
--
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