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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 | |
c2bb524b | 13 | void tty_lock(struct tty_struct *tty) |
b07471fa | 14 | { |
6d029c68 | 15 | if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty)) |
89c8d91e | 16 | return; |
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 | { | |
24 | if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty)) | |
25 | return -EIO; | |
26 | tty_kref_get(tty); | |
27 | return mutex_lock_interruptible(&tty->legacy_mutex); | |
28 | } | |
29 | ||
c2bb524b | 30 | void tty_unlock(struct tty_struct *tty) |
b07471fa | 31 | { |
6d029c68 | 32 | if (WARN(tty->magic != TTY_MAGIC, "U Bad %p\n", tty)) |
89c8d91e | 33 | return; |
89c8d91e AC |
34 | mutex_unlock(&tty->legacy_mutex); |
35 | tty_kref_put(tty); | |
b07471fa AB |
36 | } |
37 | EXPORT_SYMBOL(tty_unlock); | |
89c8d91e | 38 | |
c2bb524b | 39 | void tty_lock_slave(struct tty_struct *tty) |
89c8d91e | 40 | { |
eef15e2a | 41 | if (tty && tty != tty->link) |
2febdb63 | 42 | tty_lock(tty); |
89c8d91e | 43 | } |
89c8d91e | 44 | |
c2bb524b | 45 | void tty_unlock_slave(struct tty_struct *tty) |
89c8d91e | 46 | { |
2aff5e2b PH |
47 | if (tty && tty != tty->link) |
48 | tty_unlock(tty); | |
89c8d91e | 49 | } |
2febdb63 PH |
50 | |
51 | void tty_set_lock_subclass(struct tty_struct *tty) | |
52 | { | |
3abf87cd | 53 | lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE); |
2febdb63 | 54 | } |