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>

1 files changed, 0 insertions, 2 deletions

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;
 }