USB: lvstest: convert to use dev_groups

USB drivers now support the ability for the driver core to handle the
creation and removal of device-specific sysfs files in a race-free
manner.  Take advantage of that by converting the driver to use this by
moving the sysfs attributes into a group and assigning the dev_groups
pointer to it.

Link: https://lore.kernel.org/r/20190806144502.17792-10-gregkh@linuxfoundation.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/misc/lvstest.c

@@ -310,7 +310,7 @@ static ssize_t enable_compliance_store(struct device *dev,
 }
 static DEVICE_ATTR_WO(enable_compliance);
 
-static struct attribute *lvs_attributes[] = {
+static struct attribute *lvs_attrs[] = {
 	&dev_attr_get_dev_desc.attr,
 	&dev_attr_u1_timeout.attr,
 	&dev_attr_u2_timeout.attr,
@@ -321,10 +321,7 @@ static struct attribute *lvs_attributes[] = {
 	&dev_attr_enable_compliance.attr,
 	NULL
 };
-
-static const struct attribute_group lvs_attr_group = {
-	.attrs = lvs_attributes,
-};
+ATTRIBUTE_GROUPS(lvs);
 
 static void lvs_rh_work(struct work_struct *work)
 {
@@ -439,12 +436,6 @@ static int lvs_rh_probe(struct usb_interface *intf,
 
 	INIT_WORK(&lvs->rh_work, lvs_rh_work);
 
-	ret = sysfs_create_group(&intf->dev.kobj, &lvs_attr_group);
-	if (ret < 0) {
-		dev_err(&intf->dev, "Failed to create sysfs node %d\n", ret);
-		goto free_urb;
-	}
-
 	pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
 	maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
 	usb_fill_int_urb(lvs->urb, hdev, pipe, &lvs->buffer[0], maxp,
@@ -453,13 +444,11 @@ static int lvs_rh_probe(struct usb_interface *intf,
 	ret = usb_submit_urb(lvs->urb, GFP_KERNEL);
 	if (ret < 0) {
 		dev_err(&intf->dev, "couldn't submit lvs urb %d\n", ret);
-		goto sysfs_remove;
+		goto free_urb;
 	}
 
 	return ret;
 
-sysfs_remove:
-	sysfs_remove_group(&intf->dev.kobj, &lvs_attr_group);
 free_urb:
 	usb_free_urb(lvs->urb);
 	return ret;
@@ -469,7 +458,6 @@ static void lvs_rh_disconnect(struct usb_interface *intf)
 {
 	struct lvs_rh *lvs = usb_get_intfdata(intf);
 
-	sysfs_remove_group(&intf->dev.kobj, &lvs_attr_group);
 	usb_poison_urb(lvs->urb); /* used in scheduled work */
 	flush_work(&lvs->rh_work);
 	usb_free_urb(lvs->urb);
@@ -479,6 +467,7 @@ static struct usb_driver lvs_driver = {
 	.name =		"lvs",
 	.probe =	lvs_rh_probe,
 	.disconnect =	lvs_rh_disconnect,
+	.dev_groups =	lvs_groups,
 };
 
 module_usb_driver(lvs_driver);