pty: Lock the devpts bits privately
This is a private pty affair, we don't want to tangle it with the tty_lock any more as we know all the other non tty locking is now handled by the vfs so we too can move. Signed-off-by: NAlan Cox <alan@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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