mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
6c80c0b94b
Move the TTY_LOCK_* enums and tty_ldisc lock functions out of the global tty.h into the local header file to clean things up. Cc: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20210408125134.3016837-10-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/tty.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/semaphore.h>
|
|
#include <linux/sched.h>
|
|
#include "tty.h"
|
|
|
|
/* Legacy tty mutex glue */
|
|
|
|
/*
|
|
* Getting the big tty mutex.
|
|
*/
|
|
|
|
void tty_lock(struct tty_struct *tty)
|
|
{
|
|
if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
|
|
return;
|
|
tty_kref_get(tty);
|
|
mutex_lock(&tty->legacy_mutex);
|
|
}
|
|
EXPORT_SYMBOL(tty_lock);
|
|
|
|
int tty_lock_interruptible(struct tty_struct *tty)
|
|
{
|
|
int ret;
|
|
|
|
if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
|
|
return -EIO;
|
|
tty_kref_get(tty);
|
|
ret = mutex_lock_interruptible(&tty->legacy_mutex);
|
|
if (ret)
|
|
tty_kref_put(tty);
|
|
return ret;
|
|
}
|
|
|
|
void tty_unlock(struct tty_struct *tty)
|
|
{
|
|
if (WARN(tty->magic != TTY_MAGIC, "U Bad %p\n", tty))
|
|
return;
|
|
mutex_unlock(&tty->legacy_mutex);
|
|
tty_kref_put(tty);
|
|
}
|
|
EXPORT_SYMBOL(tty_unlock);
|
|
|
|
void tty_lock_slave(struct tty_struct *tty)
|
|
{
|
|
if (tty && tty != tty->link)
|
|
tty_lock(tty);
|
|
}
|
|
|
|
void tty_unlock_slave(struct tty_struct *tty)
|
|
{
|
|
if (tty && tty != tty->link)
|
|
tty_unlock(tty);
|
|
}
|
|
|
|
void tty_set_lock_subclass(struct tty_struct *tty)
|
|
{
|
|
lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE);
|
|
}
|