From: Peter Hurley <peter@hurleysoftware.com>
Date: Mon, 11 Mar 2013 20:44:39 +0000 (-0400)
Subject: tty: Don't protect atomic operation with mutex
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8842dda2366d3d0c97646102768831f9b0ffd712;p=linux-beck.git

tty: Don't protect atomic operation with mutex

test_bit() is already atomic; drop mutex lock/unlock.

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

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index f6ce2c5fbe5b..6afca98fae21 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1391,9 +1391,7 @@ static int tty_reopen(struct tty_struct *tty)
 	}
 	tty->count++;
 
-	mutex_lock(&tty->ldisc_mutex);
 	WARN_ON(!test_bit(TTY_LDISC, &tty->flags));
-	mutex_unlock(&tty->ldisc_mutex);
 
 	return 0;
 }