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Revert "TTY: call tty_driver_lookup_tty unconditionally"
This reverts commit 631180a. It caused problems when /dev/tty is a pty: https://lkml.org/lkml/2011/10/12/401 Cc: Jiri Slaby <jslaby@suse.cz> Cc: stable <stable@vger.kernel.org> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Alan Cox <alan@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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