mirror of
https://github.com/openharmony/third_party_NuttX.git
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yinjiaming
6f982e5c13
【背景】 3.1 代码检视过程中有一些问题需要修复 【修改方案】 更改了一些拼写错误和非可执行文件的权限 【影响】 对现有的产品编译不会有影响。 re #I4XC8T Signed-off-by: yinjiaming <yinjiaming@huawei.com> Change-Id: I3566a17a9d23aff0302c4871480974a8f82ac484
138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
/****************************************************************************
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* drivers/bch/bchdev_unregister.c
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*
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* Copyright (C) 2008-2009, 2012, 2016, 2018 Gregory Nutt. All rights
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* reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <errno.h>
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#include <assert.h>
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#include <sys/ioctl.h>
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#include "bch.h"
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#include "fs/driver.h"
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#define _err PRINTK
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: bchdev_unregister
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*
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* Description:
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* Unregister character driver access to a block device that was created
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* by a previous call to bchdev_register().
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*
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****************************************************************************/
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int bchdev_unregister(const char *chardev)
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{
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struct bchlib_s *bch;
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int fd;
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int ret;
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/* Sanity check */
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if (!chardev)
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{
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return -EINVAL;
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}
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/* Open the character driver associated with chardev */
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fd = open(chardev, O_RDONLY);
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if (fd < 0)
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{
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_err("ERROR: Failed to open %s: %d\n", chardev, errno);
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return -errno;
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}
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/* Get a reference to the internal data structure. On success, we
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* will hold a reference count on the state structure.
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*/
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ret = ioctl(fd, DIOC_GETPRIV, (unsigned long)((uintptr_t)&bch));
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(void)close(fd);
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if (ret < 0)
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{
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_err("ERROR: ioctl failed: %d\n", errno);
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return -errno;
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}
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/* Lock out context switches. If there are no other references
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* and no context switches, then we can assume that we can safely
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* teardown the driver.
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*/
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LOS_TaskLock();
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/* Check if the internal structure is non-busy (we hold one reference). */
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if (bch->refs > 1)
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{
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ret = -EBUSY;
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goto errout_with_lock;
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}
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/* Unregister the driver (this cannot suspend or we lose our non-preemptive
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* state!). Once the driver is successfully unregistered, we can assume
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* we have exclusive access to the state instance.
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*/
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ret = unregister_driver(chardev);
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if (ret < 0)
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{
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goto errout_with_lock;
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}
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LOS_TaskUnlock();
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/* Release the internal structure */
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bch->refs = 0;
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return bchlib_teardown(bch);
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errout_with_lock:
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bch->refs--;
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LOS_TaskUnlock();
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return ret;
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}
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