swh:1:snp:49cd9498d6cccc5e78252c27dcb645bcf7bf0c91
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Tip revision: 168309855a7d1e16db751e9c647119fe2d2dc878 authored by Linus Torvalds on 03 January 2016, 23:15:37 UTC
Linux 4.4-rc8
Tip revision: 1683098
tty_mutex.c
#include <linux/tty.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/semaphore.h>
#include <linux/sched.h>

/* Legacy tty mutex glue */

/*
 * Getting the big tty mutex.
 */

void __lockfunc tty_lock(struct tty_struct *tty)
{
	if (tty->magic != TTY_MAGIC) {
		pr_err("L Bad %p\n", tty);
		WARN_ON(1);
		return;
	}
	tty_kref_get(tty);
	mutex_lock(&tty->legacy_mutex);
}
EXPORT_SYMBOL(tty_lock);

void __lockfunc tty_unlock(struct tty_struct *tty)
{
	if (tty->magic != TTY_MAGIC) {
		pr_err("U Bad %p\n", tty);
		WARN_ON(1);
		return;
	}
	mutex_unlock(&tty->legacy_mutex);
	tty_kref_put(tty);
}
EXPORT_SYMBOL(tty_unlock);

void __lockfunc tty_lock_slave(struct tty_struct *tty)
{
	if (tty && tty != tty->link)
		tty_lock(tty);
}

void __lockfunc 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);
}
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