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pty: Hold ctrl_lock for packet mode updates
Updates to the packet mode enable require holding the ctrl_lock; the serialization prevents corruption of adjacent fields. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Reviewed-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -47,7 +47,9 @@ static void pty_close(struct tty_struct *tty, struct file *filp)
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set_bit(TTY_IO_ERROR, &tty->flags);
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wake_up_interruptible(&tty->read_wait);
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wake_up_interruptible(&tty->write_wait);
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spin_lock_irq(&tty->ctrl_lock);
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tty->packet = 0;
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spin_unlock_irq(&tty->ctrl_lock);
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/* Review - krefs on tty_link ?? */
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if (!tty->link)
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return;
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