linux-kernel - [PATCH 56/58] tty: Push the bkl down a bit in the hangup code

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Date:	Fri, 11 Dec 2009 15:28:40 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 56/58] tty: Push the bkl down a bit in the hangup code

From: Alan Cox <alan@...ux.intel.com>

We know that the redirect field is handled via its own locking in all
places

Signed-off-by: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/char/tty_io.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index c408c81..cc941a3 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -505,8 +505,6 @@ static void do_tty_hangup(struct work_struct *work)
 	if (!tty)
 		return;
 
-	/* inuse_filps is protected by the single kernel lock */
-	lock_kernel();
 
 	spin_lock(&redirect_lock);
 	if (redirect && redirect->private_data == tty) {
@@ -515,6 +513,8 @@ static void do_tty_hangup(struct work_struct *work)
 	}
 	spin_unlock(&redirect_lock);
 
+	/* inuse_filps is protected by the single kernel lock */
+	lock_kernel();
 	check_tty_count(tty, "do_tty_hangup");
 	file_list_lock();
 	/* This breaks for file handles being sent over AF_UNIX sockets ? */
-- 
1.6.5.5

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