[PATCH v4 19/32] tty: Don't protect atomic operation with mutex

[Peter Hurley]

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

Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
---
 drivers/tty/tty_io.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index cfcd849..2261c21 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1345,9 +1345,7 @@ 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;
 }
-- 
1.8.1.2

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