mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 23:53:55 +08:00
7a4e0d2c7f
According to Greg, in the context of magic numbers as defined in magic-number.rst, "the tty layer should not need this and I'll gladly take patches" Acked-by: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Ref: https://lore.kernel.org/linux-doc/YyMlovoskUcHLEb7@kroah.com/ Link: https://lore.kernel.org/r/476d024cd6b04160a5de381ea2b9856b60088cbd.1663288066.git.nabijaczleweli@nabijaczleweli.xyz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
56 lines
994 B
C
56 lines
994 B
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)
|
|
{
|
|
tty_kref_get(tty);
|
|
mutex_lock(&tty->legacy_mutex);
|
|
}
|
|
EXPORT_SYMBOL(tty_lock);
|
|
|
|
int tty_lock_interruptible(struct tty_struct *tty)
|
|
{
|
|
int ret;
|
|
|
|
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)
|
|
{
|
|
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);
|
|
}
|