linux-imx

/*

 * drivers/dma-buf/sync_file.c

 *

 * Copyright (C) 2012 Google, Inc.

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and

 * may be copied, distributed, and modified under those terms.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */

​

#include <linux/export.h>

#include <linux/file.h>

#include <linux/fs.h>

#include <linux/kernel.h>

#include <linux/poll.h>

#include <linux/sched.h>

#include <linux/slab.h>

#include <linux/uaccess.h>

#include <linux/anon_inodes.h>

#include <linux/sync_file.h>

#include <uapi/linux/sync_file.h>

​

static const struct file_operations sync_file_fops;

​

static struct sync_file *sync_file_alloc(void)

{

    struct sync_file *sync_file;

​

    sync_file = kzalloc(sizeof(*sync_file), GFP_KERNEL);

    if (!sync_file)

        return NULL;

​

    sync_file->file = anon_inode_getfile("sync_file", &sync_file_fops,

                         sync_file, 0);

    if (IS_ERR(sync_file->file))

        goto err;

​

    init_waitqueue_head(&sync_file->wq);

​

    INIT_LIST_HEAD(&sync_file->cb.node);

​

    return sync_file;

​

err:

    kfree(sync_file);

    return NULL;

}

​

static void fence_check_cb_func(struct dma_fence *f, struct dma_fence_cb *cb)

{

    struct sync_file *sync_file;

​

    sync_file = container_of(cb, struct sync_file, cb);

​

    wake_up_all(&sync_file->wq);

}

​