Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2019 Mellanox Technologies. All rights reserved */
3
4#include <linux/debugfs.h>
5#include <linux/err.h>
6#include <linux/kernel.h>
7#include <linux/slab.h>
8
9#include "netdevsim.h"
10
11static struct dentry *nsim_sdev_ddir;
12
13static u32 nsim_sdev_id;
14
15struct netdevsim_shared_dev *nsim_sdev_get(struct netdevsim *joinns)
16{
17 struct netdevsim_shared_dev *sdev;
18 char sdev_ddir_name[10];
19 int err;
20
21 if (joinns) {
22 if (WARN_ON(!joinns->sdev))
23 return ERR_PTR(-EINVAL);
24 sdev = joinns->sdev;
25 sdev->refcnt++;
26 return sdev;
27 }
28
29 sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
30 if (!sdev)
31 return ERR_PTR(-ENOMEM);
32 sdev->refcnt = 1;
33 sdev->switch_id = nsim_sdev_id++;
34
35 sprintf(sdev_ddir_name, "%u", sdev->switch_id);
36 sdev->ddir = debugfs_create_dir(sdev_ddir_name, nsim_sdev_ddir);
37 if (IS_ERR_OR_NULL(sdev->ddir)) {
38 err = PTR_ERR_OR_ZERO(sdev->ddir) ?: -EINVAL;
39 goto err_sdev_free;
40 }
41
42 return sdev;
43
44err_sdev_free:
45 nsim_sdev_id--;
46 kfree(sdev);
47 return ERR_PTR(err);
48}
49
50void nsim_sdev_put(struct netdevsim_shared_dev *sdev)
51{
52 if (--sdev->refcnt)
53 return;
54 debugfs_remove_recursive(sdev->ddir);
55 kfree(sdev);
56}
57
58int nsim_sdev_init(void)
59{
60 nsim_sdev_ddir = debugfs_create_dir(DRV_NAME "_sdev", NULL);
61 if (IS_ERR_OR_NULL(nsim_sdev_ddir))
62 return -ENOMEM;
63 return 0;
64}
65
66void nsim_sdev_exit(void)
67{
68 debugfs_remove_recursive(nsim_sdev_ddir);
69}