linux-kernel - [PATCH -next v2 21/26] pty: Don't drop pty master tty lock to hangup slave

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Message-Id: <1415207589-15967-22-git-send-email-peter@hurleysoftware.com>
Date:	Wed,  5 Nov 2014 12:13:04 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH -next v2 21/26] pty: Don't drop pty master tty lock to hangup slave

With the revised tty lock order and lockdep annotation, claiming
the pty slave lock is now safe while still holding the pty master lock.

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

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 11db7dc..bee9776 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -66,9 +66,7 @@ static void pty_close(struct tty_struct *tty, struct file *filp)
 			mutex_unlock(&devpts_mutex);
 		}
 #endif
-		tty_unlock(tty);
 		tty_vhangup(tty->link);
-		tty_lock(tty);
 	}
 }
 
-- 
2.1.3

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