0545e9dc6d
commit d1edce71135cc6d98c0a4b5729774542b676e769 Author: sophgo-forum-service <forum_service@sophgo.com> Date: Fri Mar 15 16:07:33 2024 +0800 [fix] recommend using ssh method to clone repo. [fix] fix sensor driver repo branch name.
61 lines
1.1 KiB
C
61 lines
1.1 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>
|
|
|
|
/* 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);
|
|
}
|