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Commit | Line | Data |
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b07471fa AB |
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 | ||
89c8d91e AC |
7 | /* Legacy tty mutex glue */ |
8 | ||
b07471fa AB |
9 | /* |
10 | * Getting the big tty mutex. | |
11 | */ | |
89c8d91e | 12 | |
2febdb63 | 13 | void __lockfunc tty_lock(struct tty_struct *tty) |
b07471fa | 14 | { |
89c8d91e | 15 | if (tty->magic != TTY_MAGIC) { |
7a0c4eda | 16 | pr_err("L Bad %p\n", tty); |
89c8d91e AC |
17 | WARN_ON(1); |
18 | return; | |
19 | } | |
20 | tty_kref_get(tty); | |
2febdb63 | 21 | mutex_lock(&tty->legacy_mutex); |
b07471fa AB |
22 | } |
23 | EXPORT_SYMBOL(tty_lock); | |
24 | ||
c35f1234 PH |
25 | int tty_lock_interruptible(struct tty_struct *tty) |
26 | { | |
27 | if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty)) | |
28 | return -EIO; | |
29 | tty_kref_get(tty); | |
30 | return mutex_lock_interruptible(&tty->legacy_mutex); | |
31 | } | |
32 | ||
89c8d91e | 33 | void __lockfunc tty_unlock(struct tty_struct *tty) |
b07471fa | 34 | { |
89c8d91e | 35 | if (tty->magic != TTY_MAGIC) { |
7a0c4eda | 36 | pr_err("U Bad %p\n", tty); |
89c8d91e AC |
37 | WARN_ON(1); |
38 | return; | |
39 | } | |
40 | mutex_unlock(&tty->legacy_mutex); | |
41 | tty_kref_put(tty); | |
b07471fa AB |
42 | } |
43 | EXPORT_SYMBOL(tty_unlock); | |
89c8d91e | 44 | |
2aff5e2b | 45 | void __lockfunc tty_lock_slave(struct tty_struct *tty) |
89c8d91e | 46 | { |
eef15e2a | 47 | if (tty && tty != tty->link) |
2febdb63 | 48 | tty_lock(tty); |
89c8d91e | 49 | } |
89c8d91e | 50 | |
2aff5e2b | 51 | void __lockfunc tty_unlock_slave(struct tty_struct *tty) |
89c8d91e | 52 | { |
2aff5e2b PH |
53 | if (tty && tty != tty->link) |
54 | tty_unlock(tty); | |
89c8d91e | 55 | } |
2febdb63 PH |
56 | |
57 | void tty_set_lock_subclass(struct tty_struct *tty) | |
58 | { | |
3abf87cd | 59 | lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE); |
2febdb63 | 60 | } |