Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
b07471fa AB |
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> | |
6c80c0b9 | 7 | #include "tty.h" |
b07471fa | 8 | |
89c8d91e AC |
9 | /* Legacy tty mutex glue */ |
10 | ||
b07471fa AB |
11 | /* |
12 | * Getting the big tty mutex. | |
13 | */ | |
89c8d91e | 14 | |
c2bb524b | 15 | void tty_lock(struct tty_struct *tty) |
b07471fa | 16 | { |
89c8d91e | 17 | tty_kref_get(tty); |
2febdb63 | 18 | mutex_lock(&tty->legacy_mutex); |
b07471fa AB |
19 | } |
20 | EXPORT_SYMBOL(tty_lock); | |
21 | ||
0bfd464d PH |
22 | int tty_lock_interruptible(struct tty_struct *tty) |
23 | { | |
e9036d06 PH |
24 | int ret; |
25 | ||
0bfd464d | 26 | tty_kref_get(tty); |
e9036d06 PH |
27 | ret = mutex_lock_interruptible(&tty->legacy_mutex); |
28 | if (ret) | |
29 | tty_kref_put(tty); | |
30 | return ret; | |
0bfd464d PH |
31 | } |
32 | ||
c2bb524b | 33 | void tty_unlock(struct tty_struct *tty) |
b07471fa | 34 | { |
89c8d91e AC |
35 | mutex_unlock(&tty->legacy_mutex); |
36 | tty_kref_put(tty); | |
b07471fa AB |
37 | } |
38 | EXPORT_SYMBOL(tty_unlock); | |
89c8d91e | 39 | |
c2bb524b | 40 | void tty_lock_slave(struct tty_struct *tty) |
89c8d91e | 41 | { |
eef15e2a | 42 | if (tty && tty != tty->link) |
2febdb63 | 43 | tty_lock(tty); |
89c8d91e | 44 | } |
89c8d91e | 45 | |
c2bb524b | 46 | void tty_unlock_slave(struct tty_struct *tty) |
89c8d91e | 47 | { |
2aff5e2b PH |
48 | if (tty && tty != tty->link) |
49 | tty_unlock(tty); | |
89c8d91e | 50 | } |
2febdb63 PH |
51 | |
52 | void tty_set_lock_subclass(struct tty_struct *tty) | |
53 | { | |
3abf87cd | 54 | lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE); |
2febdb63 | 55 | } |