From: Peter Hurley <peter@hurleysoftware.com>
Date: Tue, 17 Sep 2013 16:53:34 +0000 (-0400)
Subject: n_tty: Remove superfluous reader wakeup
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=1cb40d08726468602389c9a7ec345af5ade99775;p=deliverable%2Flinux.git

n_tty: Remove superfluous reader wakeup

n_tty's .set_termios method unconditionally performs reader wakeup;
remove extra reader wakeup for canonical mode changes.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index c9a9ddd1d0bc..41c0c80094a5 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1764,9 +1764,6 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
 		ldata->lnext = 0;
 	}
 
-	if (canon_change && !L_ICANON(tty) && read_cnt(ldata))
-		wake_up_interruptible(&tty->read_wait);
-
 	ldata->icanon = (L_ICANON(tty) != 0);
 
 	if (I_ISTRIP(tty) || I_IUCLC(tty) || I_IGNCR(tty) ||