netdevsim: remove unused sdev code

// 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);

}