diff options
Diffstat (limited to 'drivers/tty/pty.c')
-rw-r--r-- | drivers/tty/pty.c | 28 |
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"); } |