7aa45305b7
Since VFS layer already contains sanity checks, so remove unnecessary lower half checks Signed-off-by: chao an <anchao@xiaomi.com>
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/****************************************************************************
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* drivers/ipcc/ipcc_open.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <nuttx/config.h>
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#include <nuttx/ipcc.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include "ipcc_priv.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ipcc_open
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*
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* Description:
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* Opens driver for use by userspace applications.
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*
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* Input Parameters:
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* filep - pointer to a file structure to open.
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*
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* Returned Value:
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* OK on successfull open, or negated errno on failure.
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*
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* Assumptions/Limitations:
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*
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****************************************************************************/
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int ipcc_open(FAR struct file *filep)
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{
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FAR struct ipcc_driver_s *priv;
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int ret;
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/* Get our private data structure */
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priv = filep->f_inode->i_private;
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/* Get exclusive access to the IPCC driver state structure */
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if ((ret = nxmutex_lock(&priv->lock)) < 0)
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{
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return ret;
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}
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/* Increment the count of open references on the driver */
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priv->crefs++;
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DEBUGASSERT(priv->crefs > 0);
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nxmutex_unlock(&priv->lock);
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return OK;
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}
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