s390/dasd: let driver core manage the sysfs attributes

Wire up device_driver->dev_groups, so that really_probe() creates the
sysfs attributes for us automatically.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://lore.kernel.org/r/20210316094513.2601218-3-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/s390/block/dasd.c

@@ -3440,15 +3440,6 @@ static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
  */
 int dasd_generic_probe(struct ccw_device *cdev)
 {
-	int ret;
-
-	ret = dasd_add_sysfs_files(cdev);
-	if (ret) {
-		DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
-				"dasd_generic_probe: could not add "
-				"sysfs entries");
-		return ret;
-	}
 	cdev->handler = &dasd_int_handler;
 
 	/*
@@ -3489,15 +3480,13 @@ void dasd_generic_remove(struct ccw_device *cdev)
 	struct dasd_block *block;
 
 	device = dasd_device_from_cdev(cdev);
-	if (IS_ERR(device)) {
-		dasd_remove_sysfs_files(cdev);
+	if (IS_ERR(device))
 		return;
-	}
+
 	if (test_and_set_bit(DASD_FLAG_OFFLINE, &device->flags) &&
 	    !test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
 		/* Already doing offline processing */
 		dasd_put_device(device);
-		dasd_remove_sysfs_files(cdev);
 		return;
 	}
 	/*
@@ -3516,8 +3505,6 @@ void dasd_generic_remove(struct ccw_device *cdev)
 	 */
 	if (block)
 		dasd_free_block(block);
-
-	dasd_remove_sysfs_files(cdev);
 }
 EXPORT_SYMBOL_GPL(dasd_generic_remove);
 

drivers/s390/block/dasd_devmap.c

@@ -1772,12 +1772,13 @@ static const struct attribute_group ext_pool_attr_group = {
 	.attrs = ext_pool_attrs,
 };
 
-static const struct attribute_group *dasd_attr_groups[] = {
+const struct attribute_group *dasd_dev_groups[] = {
 	&dasd_attr_group,
 	&capacity_attr_group,
 	&ext_pool_attr_group,
 	NULL,
 };
+EXPORT_SYMBOL_GPL(dasd_dev_groups);
 
 /*
  * Return value of the specified feature.
@@ -1895,18 +1896,6 @@ void dasd_path_remove_kobjects(struct dasd_device *device)
 }
 EXPORT_SYMBOL(dasd_path_remove_kobjects);
 
-int dasd_add_sysfs_files(struct ccw_device *cdev)
-{
-	return sysfs_create_groups(&cdev->dev.kobj, dasd_attr_groups);
-}
-
-void
-dasd_remove_sysfs_files(struct ccw_device *cdev)
-{
-	sysfs_remove_groups(&cdev->dev.kobj, dasd_attr_groups);
-}
-
-
 int
 dasd_devmap_init(void)
 {

drivers/s390/block/dasd_eckd.c

@@ -6630,6 +6630,7 @@ static struct ccw_driver dasd_eckd_driver = {
 	.driver = {
 		.name	= "dasd-eckd",
 		.owner	= THIS_MODULE,
+		.dev_groups = dasd_dev_groups,
 	},
 	.ids	     = dasd_eckd_ids,
 	.probe	     = dasd_eckd_probe,

drivers/s390/block/dasd_fba.c

@@ -64,6 +64,7 @@ static struct ccw_driver dasd_fba_driver = {
 	.driver = {
 		.name	= "dasd-fba",
 		.owner	= THIS_MODULE,
+		.dev_groups = dasd_dev_groups,
 	},
 	.ids         = dasd_fba_ids,
 	.probe       = dasd_generic_probe,

drivers/s390/block/dasd_int.h

@@ -854,8 +854,7 @@ void dasd_delete_device(struct dasd_device *);
 int dasd_get_feature(struct ccw_device *, int);
 int dasd_set_feature(struct ccw_device *, int, int);
 
-int dasd_add_sysfs_files(struct ccw_device *);
-void dasd_remove_sysfs_files(struct ccw_device *);
+extern const struct attribute_group *dasd_dev_groups[];
 void dasd_path_create_kobj(struct dasd_device *, int);
 void dasd_path_create_kobjects(struct dasd_device *);
 void dasd_path_remove_kobjects(struct dasd_device *);