scst: Port to Linux kernel v6.4

Support for the following driver core changes in the Linux kernel v6.4:
- 1aaba11da9aa ("driver core: class: remove module * from class_create()")
- 2243acd50ac4 ("driver core: class: remove struct class_interface * from callbacks")

iscsi-scst/kernel/isert-scst/isert_login.c

@@ -1000,7 +1000,11 @@ int __init isert_init_login_devs(unsigned int ndevs)
 		goto fail;  /* Make this more graceful */
 	}
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 4, 0)
 	isert_class = class_create(THIS_MODULE, "isert_scst");
+#else
+	isert_class = class_create("isert_scst");
+#endif
 
 	isert_setup_listener_cdev(&isert_listen_dev);
 

scst/src/dev_handlers/scst_user.c

@@ -4154,8 +4154,11 @@ static int __init init_scst_user(void)
 	if (res < 0)
 		goto out_cache;
 
-
+#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 4, 0)
 	dev_user_sysfs_class = class_create(THIS_MODULE, DEV_USER_NAME);
+#else
+	dev_user_sysfs_class = class_create(DEV_USER_NAME);
+#endif
 	if (IS_ERR(dev_user_sysfs_class)) {
 		PRINT_ERROR("%s", "Unable create sysfs class for SCST user "
 			"space handler");

scst/src/scst_event.c

@@ -1118,7 +1118,11 @@ int scst_event_init(void)
 		goto out;
 	}
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 4, 0)
 	scst_event_sysfs_class = class_create(THIS_MODULE, SCST_EVENT_NAME);
+#else
+	scst_event_sysfs_class = class_create(SCST_EVENT_NAME);
+#endif
 	if (IS_ERR(scst_event_sysfs_class)) {
 		PRINT_ERROR("Unable create sysfs class for SCST event");
 		res = PTR_ERR(scst_event_sysfs_class);

scst/src/scst_main.c

@@ -2139,7 +2139,11 @@ unsigned int scst_get_setup_id(void)
 }
 EXPORT_SYMBOL_GPL(scst_get_setup_id);
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 4, 0)
 static int scst_add(struct device *cdev, struct class_interface *intf)
+#else
+static int scst_add(struct device *cdev)
+#endif
 {
 	struct scsi_device *scsidp;
 	int res = 0;
@@ -2156,7 +2160,11 @@ static int scst_add(struct device *cdev, struct class_interface *intf)
 	return res;
 }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 4, 0)
 static void scst_remove(struct device *cdev, struct class_interface *intf)
+#else
+static void scst_remove(struct device *cdev)
+#endif
 {
 	struct scsi_device *scsidp;