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[PATCH] tty: make termios_sem a mutex

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[akpm@osdl.org: fix]
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Arjan van de Ven 2006-09-29 02:00:43 -07:00 committed by Linus Torvalds
parent 54306cf04c
commit 5785c95bae
3 changed files with 22 additions and 20 deletions
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23
drivers/char/tty_io.c
View file

@ -618,9 +618,9 @@ EXPORT_SYMBOL_GPL(tty_prepare_flip_string_flags);
static void tty_set_termios_ldisc(struct tty_struct *tty, int num)
{
down(&tty->termios_sem);
mutex_lock(&tty->termios_mutex);
tty->termios->c_line = num;
up(&tty->termios_sem);
mutex_unlock(&tty->termios_mutex);
}
/*
@ -1338,9 +1338,9 @@ static void do_tty_hangup(void *data)
*/
if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS)
{
down(&tty->termios_sem);
mutex_lock(&tty->termios_mutex);
*tty->termios = tty->driver->init_termios;
up(&tty->termios_sem);
mutex_unlock(&tty->termios_mutex);
}
/* Defer ldisc switch */
@ -2750,9 +2750,9 @@ static int tiocgwinsz(struct tty_struct *tty, struct winsize __user * arg)
{
int err;
down(&tty->termios_sem);
mutex_lock(&tty->termios_mutex);
err = copy_to_user(arg, &tty->winsize, sizeof(*arg));
up(&tty->termios_sem);
mutex_unlock(&tty->termios_mutex);
return err ? -EFAULT: 0;
}
@ -2782,14 +2782,15 @@ static int tiocswinsz(struct tty_struct *tty, struct tty_struct *real_tty,
if (copy_from_user(&tmp_ws, arg, sizeof(*arg)))
return -EFAULT;
down(&tty->termios_sem);
mutex_lock(&tty->termios_mutex);
if (!memcmp(&tmp_ws, &tty->winsize, sizeof(*arg)))
goto done;
#ifdef CONFIG_VT
if (tty->driver->type == TTY_DRIVER_TYPE_CONSOLE) {
if (vc_lock_resize(tty->driver_data, tmp_ws.ws_col, tmp_ws.ws_row)) {
up(&tty->termios_sem);
if (vc_lock_resize(tty->driver_data, tmp_ws.ws_col,
tmp_ws.ws_row)) {
mutex_unlock(&tty->termios_mutex);
return -ENXIO;
}
}
@ -2801,7 +2802,7 @@ static int tiocswinsz(struct tty_struct *tty, struct tty_struct *real_tty,
tty->winsize = tmp_ws;
real_tty->winsize = tmp_ws;
done:
up(&tty->termios_sem);
mutex_unlock(&tty->termios_mutex);
return 0;
}
@ -3576,7 +3577,7 @@ static void initialize_tty_struct(struct tty_struct *tty)
tty_buffer_init(tty);
INIT_WORK(&tty->buf.work, flush_to_ldisc, tty);
init_MUTEX(&tty->buf.pty_sem);
init_MUTEX(&tty->termios_sem);
mutex_init(&tty->termios_mutex);
init_waitqueue_head(&tty->write_wait);
init_waitqueue_head(&tty->read_wait);
INIT_WORK(&tty->hangup_work, do_tty_hangup, tty);

17
drivers/char/tty_ioctl.c
View file

@ -20,6 +20,7 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <asm/io.h>
#include <asm/uaccess.h>
@ -131,7 +132,7 @@ static void change_termios(struct tty_struct * tty, struct termios * new_termios
/* FIXME: we need to decide on some locking/ordering semantics
for the set_termios notification eventually */
down(&tty->termios_sem);
mutex_lock(&tty->termios_mutex);
*tty->termios = *new_termios;
unset_locked_termios(tty->termios, &old_termios, tty->termios_locked);
@ -176,7 +177,7 @@ static void change_termios(struct tty_struct * tty, struct termios * new_termios
(ld->set_termios)(tty, &old_termios);
tty_ldisc_deref(ld);
}
up(&tty->termios_sem);
mutex_unlock(&tty->termios_mutex);
}
/**
@ -284,13 +285,13 @@ static int get_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
{
struct sgttyb tmp;
down(&tty->termios_sem);
mutex_lock(&tty->termios_mutex);
tmp.sg_ispeed = 0;
tmp.sg_ospeed = 0;
tmp.sg_erase = tty->termios->c_cc[VERASE];
tmp.sg_kill = tty->termios->c_cc[VKILL];
tmp.sg_flags = get_sgflags(tty);
up(&tty->termios_sem);
mutex_unlock(&tty->termios_mutex);
return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}
@ -345,12 +346,12 @@ static int set_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
if (copy_from_user(&tmp, sgttyb, sizeof(tmp)))
return -EFAULT;
down(&tty->termios_sem);
mutex_lock(&tty->termios_mutex);
termios = *tty->termios;
termios.c_cc[VERASE] = tmp.sg_erase;
termios.c_cc[VKILL] = tmp.sg_kill;
set_sgflags(&termios, tmp.sg_flags);
up(&tty->termios_sem);
mutex_unlock(&tty->termios_mutex);
change_termios(tty, &termios);
return 0;
}
@ -592,11 +593,11 @@ int n_tty_ioctl(struct tty_struct * tty, struct file * file,
case TIOCSSOFTCAR:
if (get_user(arg, (unsigned int __user *) arg))
return -EFAULT;
down(&tty->termios_sem);
mutex_lock(&tty->termios_mutex);
tty->termios->c_cflag =
((tty->termios->c_cflag & ~CLOCAL) |
(arg ? CLOCAL : 0));
up(&tty->termios_sem);
mutex_unlock(&tty->termios_mutex);
return 0;
default:
return -ENOIOCTLCMD;

2
include/linux/tty.h
View file

@ -174,7 +174,7 @@ struct tty_struct {
struct tty_driver *driver;
int index;
struct tty_ldisc ldisc;
struct semaphore termios_sem;
struct mutex termios_mutex;
struct termios *termios, *termios_locked;
char name[64];
int pgrp;