linux-4.4.1/dma_buf_release() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-4.4.1/dma_buf_release() へ行く。
  • 1 (2016-02-25 (木) 15:24:43)

参照元†

• linux-4.4.1/dma_buf_fops(global)

説明†

• パス: linux-4.4.1/drivers/dma-buf/dma-buf.c

• FIXME: これは何？
  • 説明

引数†

• struct inode *inode
  • linux-4.4.1/inode
• struct file *file
  • linux-4.4.1/file

返り値†

• int

参考†

実装†

static int dma_buf_release(struct inode *inode, struct file *file)
{
        struct dma_buf *dmabuf;

• • linux-4.4.1/dma_buf

        if (!is_dma_buf_file(file))
                return -EINVAL;

• • linux-4.4.1/is_dma_buf_file()

        dmabuf = file->private_data;

        BUG_ON(dmabuf->vmapping_counter);

• • linux-4.4.1/BUG_ON()

        /*
         * Any fences that a dma-buf poll can wait on should be signaled
         * before releasing dma-buf. This is the responsibility of each
         * driver that uses the reservation objects.
         *
         * If you hit this BUG() it means someone dropped their ref to the
         * dma-buf while still having pending operation to the buffer.
         */
        BUG_ON(dmabuf->cb_shared.active || dmabuf->cb_excl.active);

• • dmabuf->cb_shared は 型
  • dmabuf->cb_excl は 型
  • [[linux-4.4.1/]]

        dmabuf->ops->release(dmabuf);

• • [[linux-4.4.1/]]

        mutex_lock(&db_list.lock);
        list_del(&dmabuf->list_node);
        mutex_unlock(&db_list.lock);

• • linux-4.4.1/mutex_lock()
  • linux-4.4.1/list_del()
  • linux-4.4.1/mutex_unlock()
  • linux-4.4.1/db_list(global)

        if (dmabuf->resv == (struct reservation_object *)&dmabuf[1])
                reservation_object_fini(dmabuf->resv);

• • linux-4.4.1/reservation_object_fini()

        module_put(dmabuf->owner);
        kfree(dmabuf);

• • linux-4.4.1/module_put()
  • linux-4.4.1/kfree()

        return 0;
}

コメント†