linux-kernel - [PATCH v3 19/19] tty: Avoid unnecessary temporaries for tty->ldisc

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Message-Id: <1452494468-21359-20-git-send-email-peter@hurleysoftware.com>
Date:	Sun, 10 Jan 2016 22:41:08 -0800
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH v3 19/19] tty: Avoid unnecessary temporaries for tty->ldisc

tty_ldisc_setup() is race-free and can reference tty->ldisc without
snapshots.

Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/tty_ldisc.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 199e4b4..b404c20 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -754,17 +754,14 @@ void tty_ldisc_hangup(struct tty_struct *tty, bool reinit)
 
 int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty)
 {
-	struct tty_ldisc *ld = tty->ldisc;
-	int retval;
-
-	retval = tty_ldisc_open(tty, ld);
+	int retval = tty_ldisc_open(tty, tty->ldisc);
 	if (retval)
 		return retval;
 
 	if (o_tty) {
 		retval = tty_ldisc_open(o_tty, o_tty->ldisc);
 		if (retval) {
-			tty_ldisc_close(tty, ld);
+			tty_ldisc_close(tty, tty->ldisc);
 			return retval;
 		}
 	}
-- 
2.7.0