diff options
Diffstat (limited to 'nuttx/drivers/bch/bchdev_unregister.c')
-rw-r--r-- | nuttx/drivers/bch/bchdev_unregister.c | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/nuttx/drivers/bch/bchdev_unregister.c b/nuttx/drivers/bch/bchdev_unregister.c deleted file mode 100644 index 8c7360882..000000000 --- a/nuttx/drivers/bch/bchdev_unregister.c +++ /dev/null @@ -1,160 +0,0 @@ -/**************************************************************************** - * drivers/bch/bchdev_unregister.c - * - * Copyright (C) 2008-2009, 2012 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#include <sys/stat.h> -#include <sys/ioctl.h> - -#include <unistd.h> -#include <fcntl.h> -#include <sched.h> -#include <errno.h> -#include <assert.h> -#include <debug.h> - -#include <nuttx/fs/fs.h> -#include <nuttx/fs/ioctl.h> - -#include "bch_internal.h" - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Function Prototypes - ****************************************************************************/ - -/**************************************************************************** - * Public Data - ****************************************************************************/ - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: bchdev_unregister - * - * Description: - * Unregister character driver access to a block device that was created - * by a previous call to bchdev_register(). - * - ****************************************************************************/ - -int bchdev_unregister(FAR const char *chardev) -{ - FAR struct bchlib_s *bch; - int fd; - int ret; - - /* Sanity check */ - -#ifdef CONFIG_DEBUG - if (!chardev) - { - return -EINVAL; - } -#endif - - /* Open the character driver associated with chardev */ - - fd = open(chardev, O_RDONLY); - if (fd < 0) - { - dbg("Failed to open %s: %d\n", chardev, errno); - return -errno; - } - - /* Get a reference to the internal data structure. On success, we - * will hold a reference count on the state structure. - */ - - ret = ioctl(fd, DIOC_GETPRIV, (unsigned long)((uintptr_t)&bch)); - (void)close(fd); - - if (ret < 0) - { - dbg("ioctl failed: %d\n", errno); - return -errno; - } - - /* Lock out context switches. If there are no other references - * and no context switches, then we can assume that we can safely - * teardown the driver. - */ - - sched_lock(); - - /* Check if the internal structure is non-busy (we hold one reference). */ - - if (bch->refs > 1) - { - ret = -EBUSY; - goto errout_with_lock; - } - - /* Unregister the driver (this cannot suspend or we lose our non-preemptive - * state!). Once the driver is successfully unregistered, we can assume - * we have exclusive access to the state instance. - */ - - ret = unregister_driver(chardev); - if (ret < 0) - { - goto errout_with_lock; - } - - sched_unlock(); - - /* Release the internal structure */ - - bch->refs = 0; - return bchlib_teardown(bch); - -errout_with_lock: - bch->refs--; - sched_unlock(); - return ret; -} |