// SPDX-License-Identifier: GPL-2.0/* Copyright (c) 2019 Mellanox Technologies. All rights reserved */ #include <linux/debugfs.h>#include <linux/err.h>#include <linux/kernel.h>#include <linux/slab.h> #include "netdevsim.h" static struct dentry *nsim_sdev_ddir; static u32 nsim_sdev_id; struct netdevsim_shared_dev *nsim_sdev_get(struct netdevsim *joinns){	struct netdevsim_shared_dev *sdev;	char sdev_ddir_name[10];	int err; 	if (joinns) {		if (WARN_ON(!joinns->sdev))			return ERR_PTR(-EINVAL);		sdev = joinns->sdev;		sdev->refcnt++;		return sdev;	} 	sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);	if (!sdev)		return ERR_PTR(-ENOMEM);	sdev->refcnt = 1;	sdev->switch_id = nsim_sdev_id++; 	sprintf(sdev_ddir_name, "%u", sdev->switch_id);	sdev->ddir = debugfs_create_dir(sdev_ddir_name, nsim_sdev_ddir);	if (IS_ERR_OR_NULL(sdev->ddir)) {		err = PTR_ERR_OR_ZERO(sdev->ddir) ?: -EINVAL;		goto err_sdev_free;	} 	return sdev; err_sdev_free:	nsim_sdev_id--;	kfree(sdev);	return ERR_PTR(err);} void nsim_sdev_put(struct netdevsim_shared_dev *sdev){	if (--sdev->refcnt)		return;	debugfs_remove_recursive(sdev->ddir);	kfree(sdev);} int nsim_sdev_init(void){	nsim_sdev_ddir = debugfs_create_dir(DRV_NAME "_sdev", NULL);	if (IS_ERR_OR_NULL(nsim_sdev_ddir))		return -ENOMEM;	return 0;} void nsim_sdev_exit(void){	debugfs_remove_recursive(nsim_sdev_ddir);}