linux-kernel - [RFC 6/9] tty: never hold tty_lock() while getting tty

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Date:	Tue, 30 Mar 2010 22:56:17 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Greg KH <gregkh@...e.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Kacur <jkacur@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>, Ingo Molnar <mingo@...e.hu>,
	Arnd Bergmann <arnd@...ay.de.ibm.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: [RFC 6/9] tty: never hold tty_lock() while getting tty_mutex

From: Arnd Bergmann <arnd@...ay.de.ibm.com>

This avoids having to annotate every mutex_lock(&tty_mutex)
as mutex_lock_tty.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/char/pty.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index 72fb501..0a87b52 100644
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -638,9 +638,11 @@ static int __ptmx_open(struct inode *inode, struct file *filp)
 	if (index < 0)
 		return index;
 
+	tty_unlock();
 	mutex_lock(&tty_mutex);
 	tty = tty_init_dev(ptm_driver, index, 1);
 	mutex_unlock(&tty_mutex);
+	tty_lock();
 
 	if (IS_ERR(tty)) {
 		retval = PTR_ERR(tty);
-- 
1.7.0

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