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-rw-r--r--drivers/char/tty_io.c5
-rw-r--r--fs/proc/proc_tty.c3
2 files changed, 7 insertions, 1 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 5d405a1bfbe..7710a6a77d9 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -3770,7 +3770,9 @@ int tty_register_driver(struct tty_driver *driver)
if (!driver->put_char)
driver->put_char = tty_default_put_char;
+ mutex_lock(&tty_mutex);
list_add(&driver->tty_drivers, &tty_drivers);
+ mutex_unlock(&tty_mutex);
if ( !(driver->flags & TTY_DRIVER_DYNAMIC_DEV) ) {
for(i = 0; i < driver->num; i++)
@@ -3796,8 +3798,9 @@ int tty_unregister_driver(struct tty_driver *driver)
unregister_chrdev_region(MKDEV(driver->major, driver->minor_start),
driver->num);
-
+ mutex_lock(&tty_mutex);
list_del(&driver->tty_drivers);
+ mutex_unlock(&tty_mutex);
/*
* Free the termios and termios_locked structures because
diff --git a/fs/proc/proc_tty.c b/fs/proc/proc_tty.c
index c1bbfbeb035..b3a473b0a19 100644
--- a/fs/proc/proc_tty.c
+++ b/fs/proc/proc_tty.c
@@ -108,6 +108,8 @@ static void *t_start(struct seq_file *m, loff_t *pos)
{
struct list_head *p;
loff_t l = *pos;
+
+ mutex_lock(&tty_mutex);
list_for_each(p, &tty_drivers)
if (!l--)
return list_entry(p, struct tty_driver, tty_drivers);
@@ -124,6 +126,7 @@ static void *t_next(struct seq_file *m, void *v, loff_t *pos)
static void t_stop(struct seq_file *m, void *v)
{
+ mutex_unlock(&tty_mutex);
}
static struct seq_operations tty_drivers_op = {