linux-kernel - [PATCH 01/18] tty: Don't change receive

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Message-Id: <1363724513-15604-2-git-send-email-peter@hurleysoftware.com>
Date:	Tue, 19 Mar 2013 16:21:36 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Cc:	Min Zhang <mzhang@...sta.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH 01/18] tty: Don't change receive_room for ioctl(TIOCSETD)

tty_set_ldisc() is guaranteed exclusive use of the line discipline
by tty_ldisc_lock_pair_timeout(); shutting off input by resetting
receive_room is unnecessary.

Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/tty_ldisc.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index ba49c0e..5a6c43d 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -537,9 +537,6 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
 		return 0;
 	}
 
-	/* FIXME: why 'shutoff' input if the ldisc is locked? */
-	tty->receive_room = 0;
-
 	old_ldisc = tty->ldisc;
 	tty_lock(tty);
 
-- 
1.8.1.2

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