USB: ueagle-atm: 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.

Cc: Matthieu CASTET <castet.matthieu@free.fr>
Cc: Stanislaw Gruszka <stf_xl@wp.pl>
Link: https://lore.kernel.org/r/20190806144502.17792-5-gregkh@linuxfoundation.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/atm/ueagle-atm.c

@@ -2458,7 +2458,7 @@ static int claim_interface(struct usb_device *usb_dev,
 	return ret;
 }
 
-static struct attribute *attrs[] = {
+static struct attribute *uea_attrs[] = {
 	&dev_attr_stat_status.attr,
 	&dev_attr_stat_mflags.attr,
 	&dev_attr_stat_human_status.attr,
@@ -2479,9 +2479,7 @@ static struct attribute *attrs[] = {
 	&dev_attr_stat_firmid.attr,
 	NULL,
 };
-static const struct attribute_group attr_grp = {
-	.attrs = attrs,
-};
+ATTRIBUTE_GROUPS(uea);
 
 static int uea_bind(struct usbatm_data *usbatm, struct usb_interface *intf,
 		   const struct usb_device_id *id)
@@ -2550,18 +2548,12 @@ static int uea_bind(struct usbatm_data *usbatm, struct usb_interface *intf,
 		}
 	}
 
-	ret = sysfs_create_group(&intf->dev.kobj, &attr_grp);
-	if (ret < 0)
-		goto error;
-
 	ret = uea_boot(sc);
 	if (ret < 0)
-		goto error_rm_grp;
+		goto error;
 
 	return 0;
 
-error_rm_grp:
-	sysfs_remove_group(&intf->dev.kobj, &attr_grp);
 error:
 	kfree(sc);
 	return ret;
@@ -2571,7 +2563,6 @@ static void uea_unbind(struct usbatm_data *usbatm, struct usb_interface *intf)
 {
 	struct uea_softc *sc = usbatm->driver_data;
 
-	sysfs_remove_group(&intf->dev.kobj, &attr_grp);
 	uea_stop(sc);
 	kfree(sc);
 }
@@ -2721,6 +2712,7 @@ static struct usb_driver uea_driver = {
 	.id_table = uea_ids,
 	.probe = uea_probe,
 	.disconnect = uea_disconnect,
+	.dev_groups = uea_groups,
 };
 
 MODULE_DEVICE_TABLE(usb, uea_ids);