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Linux kernel mirror (for testing)
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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#include "tty.h"
8
9/* Legacy tty mutex glue */
10
11/*
12 * Getting the big tty mutex.
13 */
14
15void tty_lock(struct tty_struct *tty)
16{
17 if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
18 return;
19 tty_kref_get(tty);
20 mutex_lock(&tty->legacy_mutex);
21}
22EXPORT_SYMBOL(tty_lock);
23
24int tty_lock_interruptible(struct tty_struct *tty)
25{
26 int ret;
27
28 if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
29 return -EIO;
30 tty_kref_get(tty);
31 ret = mutex_lock_interruptible(&tty->legacy_mutex);
32 if (ret)
33 tty_kref_put(tty);
34 return ret;
35}
36
37void tty_unlock(struct tty_struct *tty)
38{
39 if (WARN(tty->magic != TTY_MAGIC, "U Bad %p\n", tty))
40 return;
41 mutex_unlock(&tty->legacy_mutex);
42 tty_kref_put(tty);
43}
44EXPORT_SYMBOL(tty_unlock);
45
46void tty_lock_slave(struct tty_struct *tty)
47{
48 if (tty && tty != tty->link)
49 tty_lock(tty);
50}
51
52void tty_unlock_slave(struct tty_struct *tty)
53{
54 if (tty && tty != tty->link)
55 tty_unlock(tty);
56}
57
58void tty_set_lock_subclass(struct tty_struct *tty)
59{
60 lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE);
61}