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: NPeter Hurley <peter@hurleysoftware.com> Reviewed-by: NAlan Cox <alan@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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