1 /****************************************************************************
2 * fs/driver/fs_unregisterdriver.c
3 *
4 * Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved.
5 * Author: Gregory Nutt <gnutt@nuttx.org>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name NuttX nor the names of its contributors may be
18 * used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
28 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
31 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 *
34 ****************************************************************************/
35
36 /****************************************************************************
37 * Included Files
38 ****************************************************************************/
39
40 #include "vfs_config.h"
41 #include "fs/driver.h"
42 #include "vnode.h"
43 #include "string.h"
44 #include "errno.h"
45
46 /****************************************************************************
47 * Public Functions
48 ****************************************************************************/
49
50 /****************************************************************************
51 * Name: unregister_driver
52 *
53 * Description:
54 * Remove the character driver vnode at 'path' from the pseudo-file system
55 *
56 ****************************************************************************/
57
unregister_driver(const char * path)58 int unregister_driver(const char *path)
59 {
60 struct Vnode *vnode = NULL;
61 int ret;
62 if (path == NULL)
63 {
64 return -EINVAL;
65 }
66 VnodeHold();
67 ret = VnodeLookup(path, &vnode, V_DUMMY);
68 if (ret != OK)
69 {
70 VnodeDrop();
71 return ret;
72 }
73 if (vnode->type != VNODE_TYPE_CHR && vnode->type != VNODE_TYPE_BLK)
74 {
75 VnodeDrop();
76 return -EPERM;
77 }
78 ret = VnodeFree(vnode);
79 VnodeDrop();
80
81 return ret;
82 }
83