tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 __lockfunc tty_lock(struct tty_struct *tty)
14{
15 if (tty->magic != TTY_MAGIC) {
16 pr_err("L Bad %p\n", tty);
17 WARN_ON(1);
18 return;
19 }
20 tty_kref_get(tty);
21 mutex_lock(&tty->legacy_mutex);
22}
23EXPORT_SYMBOL(tty_lock);
24
25void __lockfunc tty_unlock(struct tty_struct *tty)
26{
27 if (tty->magic != TTY_MAGIC) {
28 pr_err("U Bad %p\n", tty);
29 WARN_ON(1);
30 return;
31 }
32 mutex_unlock(&tty->legacy_mutex);
33 tty_kref_put(tty);
34}
35EXPORT_SYMBOL(tty_unlock);
36
37void __lockfunc tty_lock_slave(struct tty_struct *tty)
38{
39 if (tty && tty != tty->link)
40 tty_lock(tty);
41}
42
43void __lockfunc tty_unlock_slave(struct tty_struct *tty)
44{
45 if (tty && tty != tty->link)
46 tty_unlock(tty);
47}
48
49void tty_set_lock_subclass(struct tty_struct *tty)
50{
51 lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE);
52}