From: Daniel Walker <dwalker@mvista.com>

I couldn't find any users, so removing it..

Signed-off-by: Daniel Walker <dwalker@mvista.com>
Acked-by: Alan Cox <alan@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/char/tty_io.c |    1 -
 include/linux/tty.h   |    1 -
 2 files changed, 2 deletions(-)

diff -puN drivers/char/tty_io.c~drivers-char-tty_ioc-remove-pty_sem drivers/char/tty_io.c
--- a/drivers/char/tty_io.c~drivers-char-tty_ioc-remove-pty_sem
+++ a/drivers/char/tty_io.c
@@ -3721,7 +3721,6 @@ static void initialize_tty_struct(struct
 	tty->buf.head = tty->buf.tail = NULL;
 	tty_buffer_init(tty);
 	INIT_DELAYED_WORK(&tty->buf.work, flush_to_ldisc);
-	init_MUTEX(&tty->buf.pty_sem);
 	mutex_init(&tty->termios_mutex);
 	init_waitqueue_head(&tty->write_wait);
 	init_waitqueue_head(&tty->read_wait);
diff -puN include/linux/tty.h~drivers-char-tty_ioc-remove-pty_sem include/linux/tty.h
--- a/include/linux/tty.h~drivers-char-tty_ioc-remove-pty_sem
+++ a/include/linux/tty.h
@@ -74,7 +74,6 @@ struct tty_buffer {
 
 struct tty_bufhead {
 	struct delayed_work work;
-	struct semaphore pty_sem;
 	spinlock_t lock;
 	struct tty_buffer *head;	/* Queue head */
 	struct tty_buffer *tail;	/* Active buffer */
_