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path: root/drivers/tty/pty.c
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Diffstat (limited to 'drivers/tty/pty.c')
-rw-r--r--drivers/tty/pty.c28
1 files changed, 17 insertions, 11 deletions
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 79ff3a5e925d..c24b4db243b9 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -38,16 +38,18 @@ static void pty_close(struct tty_struct *tty, struct file *filp)
if (tty->driver->subtype == PTY_TYPE_MASTER)
WARN_ON(tty->count > 1);
else {
+ if (test_bit(TTY_IO_ERROR, &tty->flags))
+ return;
if (tty->count > 2)
return;
}
+ set_bit(TTY_IO_ERROR, &tty->flags);
wake_up_interruptible(&tty->read_wait);
wake_up_interruptible(&tty->write_wait);
tty->packet = 0;
/* Review - krefs on tty_link ?? */
if (!tty->link)
return;
- tty->link->packet = 0;
set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
wake_up_interruptible(&tty->link->read_wait);
wake_up_interruptible(&tty->link->write_wait);
@@ -55,9 +57,10 @@ static void pty_close(struct tty_struct *tty, struct file *filp)
set_bit(TTY_OTHER_CLOSED, &tty->flags);
#ifdef CONFIG_UNIX98_PTYS
if (tty->driver == ptm_driver) {
- mutex_lock(&devpts_mutex);
- devpts_pty_kill(tty->link->driver_data);
- mutex_unlock(&devpts_mutex);
+ mutex_lock(&devpts_mutex);
+ if (tty->link->driver_data)
+ devpts_pty_kill(tty->link->driver_data);
+ mutex_unlock(&devpts_mutex);
}
#endif
tty_unlock(tty);
@@ -120,10 +123,10 @@ static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
if (c > 0) {
/* Stuff the data into the input queue of the other end */
- c = tty_insert_flip_string(to, buf, c);
+ c = tty_insert_flip_string(to->port, buf, c);
/* And shovel */
if (c) {
- tty_flip_buffer_push(to);
+ tty_flip_buffer_push(to->port);
tty_wakeup(tty);
}
}
@@ -246,14 +249,17 @@ static int pty_open(struct tty_struct *tty, struct file *filp)
if (!tty || !tty->link)
goto out;
+ set_bit(TTY_IO_ERROR, &tty->flags);
+
retval = -EIO;
if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
goto out;
if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
goto out;
- if (tty->link->count != 1)
+ if (tty->driver->subtype == PTY_TYPE_SLAVE && tty->link->count != 1)
goto out;
+ clear_bit(TTY_IO_ERROR, &tty->flags);
clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
set_bit(TTY_THROTTLED, &tty->flags);
retval = 0;
@@ -663,7 +669,7 @@ static const struct tty_operations pty_unix98_ops = {
* Allocate a unix98 pty master device from the ptmx driver.
*
* Locking: tty_mutex protects the init_dev work. tty->count should
- * protect the rest.
+ * protect the rest.
* allocated_ptys_lock handles the list of free pty numbers
*/
@@ -704,6 +710,7 @@ static int ptmx_open(struct inode *inode, struct file *filp)
mutex_unlock(&tty_mutex);
set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
+ tty->driver_data = inode;
tty_add_file(tty, filp);
@@ -714,14 +721,13 @@ static int ptmx_open(struct inode *inode, struct file *filp)
retval = PTR_ERR(slave_inode);
goto err_release;
}
+ tty->link->driver_data = slave_inode;
retval = ptm_driver->ops->open(tty, filp);
if (retval)
goto err_release;
tty_unlock(tty);
- tty->driver_data = inode;
- tty->link->driver_data = slave_inode;
return 0;
err_release:
tty_unlock(tty);
@@ -797,7 +803,7 @@ static void __init unix98_pty_init(void)
cdev_init(&ptmx_cdev, &ptmx_fops);
if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) ||
register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0)
- panic("Couldn't register /dev/ptmx driver\n");
+ panic("Couldn't register /dev/ptmx driver");
device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx");
}