Commit 8842dda2 authored Mar 11, 2013 by Peter Hurley Committed by Greg Kroah-Hartman Mar 18, 2013

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>

parent fc575ee6

drivers/tty/tty_io.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -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;
		}