linux-stable/drivers/char/tpm/tpm-dev.c
Thomas Gleixner b886d83c5b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation version 2 of the license

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 315 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Armijn Hemel <armijn@tjaldur.nl>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190531190115.503150771@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:17 +02:00

68 lines
1.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2004 IBM Corporation
* Authors:
* Leendert van Doorn <leendert@watson.ibm.com>
* Dave Safford <safford@watson.ibm.com>
* Reiner Sailer <sailer@watson.ibm.com>
* Kylene Hall <kjhall@us.ibm.com>
*
* Copyright (C) 2013 Obsidian Research Corp
* Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
*
* Device file system interface to the TPM
*/
#include <linux/slab.h>
#include "tpm-dev.h"
static int tpm_open(struct inode *inode, struct file *file)
{
struct tpm_chip *chip;
struct file_priv *priv;
chip = container_of(inode->i_cdev, struct tpm_chip, cdev);
/* It's assured that the chip will be opened just once,
* by the check of is_open variable, which is protected
* by driver_lock. */
if (test_and_set_bit(0, &chip->is_open)) {
dev_dbg(&chip->dev, "Another process owns this TPM\n");
return -EBUSY;
}
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (priv == NULL)
goto out;
tpm_common_open(file, chip, priv, NULL);
return 0;
out:
clear_bit(0, &chip->is_open);
return -ENOMEM;
}
/*
* Called on file close
*/
static int tpm_release(struct inode *inode, struct file *file)
{
struct file_priv *priv = file->private_data;
tpm_common_release(file, priv);
clear_bit(0, &priv->chip->is_open);
kfree(priv);
return 0;
}
const struct file_operations tpm_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.open = tpm_open,
.read = tpm_common_read,
.write = tpm_common_write,
.poll = tpm_common_poll,
.release = tpm_release,
};