cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tty_mutex.c (1194B)

      1// SPDX-License-Identifier: GPL-2.0
      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>
      7#include "tty.h"
      8
      9/* Legacy tty mutex glue */
     10
     11/*
     12 * Getting the big tty mutex.
     13 */
     14
     15void tty_lock(struct tty_struct *tty)
     16{
     17	if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
     18		return;
     19	tty_kref_get(tty);
     20	mutex_lock(&tty->legacy_mutex);
     21}
     22EXPORT_SYMBOL(tty_lock);
     23
     24int tty_lock_interruptible(struct tty_struct *tty)
     25{
     26	int ret;
     27
     28	if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
     29		return -EIO;
     30	tty_kref_get(tty);
     31	ret = mutex_lock_interruptible(&tty->legacy_mutex);
     32	if (ret)
     33		tty_kref_put(tty);
     34	return ret;
     35}
     36
     37void tty_unlock(struct tty_struct *tty)
     38{
     39	if (WARN(tty->magic != TTY_MAGIC, "U Bad %p\n", tty))
     40		return;
     41	mutex_unlock(&tty->legacy_mutex);
     42	tty_kref_put(tty);
     43}
     44EXPORT_SYMBOL(tty_unlock);
     45
     46void tty_lock_slave(struct tty_struct *tty)
     47{
     48	if (tty && tty != tty->link)
     49		tty_lock(tty);
     50}
     51
     52void tty_unlock_slave(struct tty_struct *tty)
     53{
     54	if (tty && tty != tty->link)
     55		tty_unlock(tty);
     56}
     57
     58void tty_set_lock_subclass(struct tty_struct *tty)
     59{
     60	lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE);
     61}