linux-kernel - [PATCH][RT] pty low latency

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Message-Id: <1250138537.15796.18.camel@quadrophenia.thebigcorporation.com>
Date:	Wed, 12 Aug 2009 21:42:17 -0700
From:	Sven-Thorsten Dietrich <sdietrich@...ell.com>
To:	linux-rt-users <linux-rt-users@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH][RT] pty low latency


Subject: add hunks dropped in rt 2.6.31-rc5-rt1.1 forward port
From: patch-2.6.31-rc4-rt1
Signed-off-by: Sven-Thorsten Dietrich <sdietrich@...e.de>
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -52,6 +52,7 @@ static void pty_close(struct tty_struct *tty, struct file *filp)
 		return;
 	tty->link->packet = 0;
 	set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
+	tty_flip_buffer_push(tty->link);
 	wake_up_interruptible(&tty->link->read_wait);
 	wake_up_interruptible(&tty->link->write_wait);
 	if (tty->driver->subtype == PTY_TYPE_MASTER) {
@@ -207,6 +208,7 @@ static int pty_open(struct tty_struct *tty, struct file *filp)
 	clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
 	set_bit(TTY_THROTTLED, &tty->flags);
 	retval = 0;
+	tty->low_latency = 1;
 out:
 	return retval;
 }


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