xen: Populate xenbus device attributes

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.

This patch uses the dev_attrs field of the bus type to specify default
attributes for all devices.

Signed-off-by: Bastian Blank <waldi@debian.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 14 insertions, 27 deletions

diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 739769551e3..2ed0b045c69 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;