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 f6ce2c5fbe5b9c8ccd88e68ec2a0b7764faeed5c..6afca98fae21654e73a1275886ed7832cef0fe66 100644 (file)
--- 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;
 }