[PATCH] remove TTY_DONT_FLIP

Remove TTY_DONT_FLIP tty flag.  This flag was introduced in 2.1.X kernels
to prevent the N_TTY line discipline functions read_chan() and
n_tty_receive_buf() from running at the same time.  2.2.15 introduced
tty->read_lock to protect access to the N_TTY read buffer, which is the
only state requiring protection between these two functions.

The current TTY_DONT_FLIP implementation is broken for SMP, and is not
universally honored by drivers that send data directly to the line
discipline receive_buf function.

Because TTY_DONT_FLIP is not necessary, is broken in implementation, and is
not universally honored, it is removed.

Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

7 files changed, 5 insertions, 35 deletions

diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index 645d9d713aec..72cfd09091e0 100644
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -996,7 +996,6 @@ static int mxser_open(struct tty_struct *tty, struct file *filp)
 
 	info->session = current->signal->session;
 	info->pgrp = process_group(current);
-	clear_bit(TTY_DONT_FLIP, &tty->flags);
 
 	/*
 	status = mxser_get_msr(info->base, 0, info->port);
diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index b9371d5bf790..603b9ade5eb0 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -1132,7 +1132,7 @@ static inline int input_available_p(struct tty_struct *tty, int amt)
  *	buffer, and once to drain the space from the (physical) beginning of
  *	the buffer to head pointer.
  *
- *	Called under the tty->atomic_read_lock sem and with TTY_DONT_FLIP set
+ *	Called under the tty->atomic_read_lock sem
  *
  */
  
@@ -1271,7 +1271,6 @@ do_it_again:
 	}
 
 	add_wait_queue(&tty->read_wait, &wait);
-	set_bit(TTY_DONT_FLIP, &tty->flags);
 	while (nr) {
 		/* First test for status change. */
 		if (tty->packet && tty->link->ctrl_status) {
@@ -1315,9 +1314,7 @@ do_it_again:
 				break;
 			}
 			n_tty_set_room(tty);
-			clear_bit(TTY_DONT_FLIP, &tty->flags);
 			timeout = schedule_timeout(timeout);
-			set_bit(TTY_DONT_FLIP, &tty->flags);
 			continue;
 		}
 		__set_current_state(TASK_RUNNING);
@@ -1394,7 +1391,6 @@ do_it_again:
 		if (time)
 			timeout = time;
 	}
-	clear_bit(TTY_DONT_FLIP, &tty->flags);
 	mutex_unlock(&tty->atomic_read_lock);
 	remove_wait_queue(&tty->read_wait, &wait);
 
diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index 9b5a2c0e7008..0c17f61549b4 100644
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -101,7 +101,7 @@ static void pty_unthrottle(struct tty_struct * tty)
  *
  * FIXME: Our pty_write method is called with our ldisc lock held but
  * not our partners. We can't just take the other one blindly without
- * risking deadlocks.  There is also the small matter of TTY_DONT_FLIP
+ * risking deadlocks.
  */
 static int pty_write(struct tty_struct * tty, const unsigned char *buf, int count)
 {
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index bd74e82d8a72..b846d87f2b56 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -784,11 +784,8 @@ restart:
 	}
 
 	clear_bit(TTY_LDISC, &tty->flags);
-	clear_bit(TTY_DONT_FLIP, &tty->flags);
-	if (o_tty) {
+	if (o_tty)
 		clear_bit(TTY_LDISC, &o_tty->flags);
-		clear_bit(TTY_DONT_FLIP, &o_tty->flags);
-	}
 	spin_unlock_irqrestore(&tty_ldisc_lock, flags);
 
 	/*
@@ -1955,7 +1952,6 @@ static void release_dev(struct file * filp)
 	 * race with the set_ldisc code path.
 	 */
 	clear_bit(TTY_LDISC, &tty->flags);
-	clear_bit(TTY_DONT_FLIP, &tty->flags);
 	cancel_delayed_work(&tty->buf.work);
 
 	/*
@@ -2784,13 +2780,6 @@ static void flush_to_ldisc(void *private_)
 	if (disc == NULL)	/*  !TTY_LDISC */
 		return;
 
-	if (test_bit(TTY_DONT_FLIP, &tty->flags)) {
-		/*
-		 * Do it after the next timer tick:
-		 */
-		schedule_delayed_work(&tty->buf.work, 1);
-		goto out;
-	}
 	spin_lock_irqsave(&tty->buf.lock, flags);
 	while((tbuf = tty->buf.head) != NULL) {
 		while ((count = tbuf->commit - tbuf->read) != 0) {
@@ -2809,7 +2798,7 @@ static void flush_to_ldisc(void *private_)
 		tty_buffer_free(tty, tbuf);
 	}
 	spin_unlock_irqrestore(&tty->buf.lock, flags);
-out:
+
 	tty_ldisc_deref(disc);
 }
 
diff --git a/drivers/serial/crisv10.c b/drivers/serial/crisv10.c
index 89700141f87e..5cacc5e74a92 100644
--- a/drivers/serial/crisv10.c
+++ b/drivers/serial/crisv10.c
@@ -2573,12 +2573,6 @@ static void flush_to_flip_buffer(struct e100_serial *info)
 
 	DFLIP(
 	  if (1) {
-
-		  if (test_bit(TTY_DONT_FLIP, &tty->flags)) {
-			  DEBUG_LOG(info->line, "*** TTY_DONT_FLIP set flip.count %i ***\n", tty->flip.count);
-			  DEBUG_LOG(info->line, "*** recv_cnt %i\n", info->recv_cnt);
-		  } else {
-		  }
 		  DEBUG_LOG(info->line, "*** rxtot %i\n", info->icount.rx);
 		  DEBUG_LOG(info->line, "ldisc %lu\n", tty->ldisc.chars_in_buffer(tty));
 		  DEBUG_LOG(info->line, "room  %lu\n", tty->ldisc.receive_room(tty));
diff --git a/drivers/serial/jsm/jsm_tty.c b/drivers/serial/jsm/jsm_tty.c
index 7d823705193c..f8262e6ad8d3 100644
--- a/drivers/serial/jsm/jsm_tty.c
+++ b/drivers/serial/jsm/jsm_tty.c
@@ -589,13 +589,6 @@ void jsm_input(struct jsm_channel *ch)
 	ld = tty_ldisc_ref(tp);
 
 	/*
-	 * If the DONT_FLIP flag is on, don't flush our buffer, and act
-	 * like the ld doesn't have any space to put the data right now.
-	 */
-	if (test_bit(TTY_DONT_FLIP, &tp->flags))
-		len = 0;
-
-	/*
 	 * If we were unable to get a reference to the ld,
 	 * don't flush our buffer, and act like the ld doesn't
 	 * have any space to put the data right now.
diff --git a/drivers/usb/serial/ir-usb.c b/drivers/usb/serial/ir-usb.c
index 9432c7302275..d7f3f736a692 100644
--- a/drivers/usb/serial/ir-usb.c
+++ b/drivers/usb/serial/ir-usb.c
@@ -453,8 +453,7 @@ static void ir_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 			tty = port->tty;
 
 			/*
-			 *	FIXME: must not do this in IRQ context,
-			 *	must honour TTY_DONT_FLIP
+			 *	FIXME: must not do this in IRQ context
 			 */
 			tty->ldisc.receive_buf(
 				tty,