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authorArjan van de Ven <arjan@infradead.org>2006-09-29 02:00:43 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:16 -0700
commit5785c95baede8459d70c4aa0f7becb6e8b5fde4b (patch)
tree17744eac694b4eab81cba4db28c4e083d779b753 /drivers
parent54306cf04c0ea0a8c432603dbc657ab62a438668 (diff)
[PATCH] tty: make termios_sem a mutex
[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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/tty_io.c23
-rw-r--r--drivers/char/tty_ioctl.c17
2 files changed, 21 insertions, 19 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index b4f37c65b95..142427c6e8f 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -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);
diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c
index 4ad47d321bd..4d540619ac8 100644
--- a/drivers/char/tty_ioctl.c
+++ b/drivers/char/tty_ioctl.c
@@ -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;