1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/tty.h>
 3#include <linux/module.h>
 4#include <linux/kallsyms.h>
 5#include <linux/semaphore.h>
 6#include <linux/sched.h>
 7
 8/* Legacy tty mutex glue */
 9
10/*
11 * Getting the big tty mutex.
12 */
13
14void tty_lock(struct tty_struct *tty)
15{
16	if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
17		return;
18	tty_kref_get(tty);
19	mutex_lock(&tty->legacy_mutex);
20}
21EXPORT_SYMBOL(tty_lock);
22
23int tty_lock_interruptible(struct tty_struct *tty)
24{
25	int ret;
26
27	if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
28		return -EIO;
29	tty_kref_get(tty);
30	ret = mutex_lock_interruptible(&tty->legacy_mutex);
31	if (ret)
32		tty_kref_put(tty);
33	return ret;
34}
35
36void tty_unlock(struct tty_struct *tty)
37{
38	if (WARN(tty->magic != TTY_MAGIC, "U Bad %p\n", tty))
39		return;
40	mutex_unlock(&tty->legacy_mutex);
41	tty_kref_put(tty);
42}
43EXPORT_SYMBOL(tty_unlock);
44
45void tty_lock_slave(struct tty_struct *tty)
46{
47	if (tty && tty != tty->link)
48		tty_lock(tty);
49}
50
51void tty_unlock_slave(struct tty_struct *tty)
52{
53	if (tty && tty != tty->link)
54		tty_unlock(tty);
55}
56
57void tty_set_lock_subclass(struct tty_struct *tty)
58{
59	lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE);
60}

 
 1#include <linux/tty.h>
 2#include <linux/module.h>
 3#include <linux/kallsyms.h>
 4#include <linux/semaphore.h>
 5#include <linux/sched.h>
 6
 7/* Legacy tty mutex glue */
 8
 9/*
10 * Getting the big tty mutex.
11 */
12
13void tty_lock(struct tty_struct *tty)
14{
15	if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
16		return;
17	tty_kref_get(tty);
18	mutex_lock(&tty->legacy_mutex);
19}
20EXPORT_SYMBOL(tty_lock);
21
22int tty_lock_interruptible(struct tty_struct *tty)
23{
24	int ret;
25
26	if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
27		return -EIO;
28	tty_kref_get(tty);
29	ret = mutex_lock_interruptible(&tty->legacy_mutex);
30	if (ret)
31		tty_kref_put(tty);
32	return ret;
33}
34
35void tty_unlock(struct tty_struct *tty)
36{
37	if (WARN(tty->magic != TTY_MAGIC, "U Bad %p\n", tty))
38		return;
39	mutex_unlock(&tty->legacy_mutex);
40	tty_kref_put(tty);
41}
42EXPORT_SYMBOL(tty_unlock);
43
44void tty_lock_slave(struct tty_struct *tty)
45{
46	if (tty && tty != tty->link)
47		tty_lock(tty);
48}
49
50void tty_unlock_slave(struct tty_struct *tty)
51{
52	if (tty && tty != tty->link)
53		tty_unlock(tty);
54}
55
56void tty_set_lock_subclass(struct tty_struct *tty)
57{
58	lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE);
59}