From 39d95b9d857ad9ed335dd1a2d6c6de1f1ee69ce1 Mon Sep 17 00:00:00 2001
From: Jonathan Corbet <corbet@lwn.net>
Date: Fri, 16 May 2008 09:10:50 -0600
Subject: tty: cdev lock_kernel() pushdown

Parts of the serial code actually BUG() if we don't do this.
---
 drivers/char/tty_io.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index e94bee03231..fd182f2e4a6 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -2665,7 +2665,7 @@ static void release_dev(struct file *filp)
  *		 ->siglock protects ->signal/->sighand
  */
 
-static int tty_open(struct inode *inode, struct file *filp)
+static int __tty_open(struct inode *inode, struct file *filp)
 {
 	struct tty_struct *tty;
 	int noctty, retval;
@@ -2779,6 +2779,19 @@ got_driver:
 	return 0;
 }
 
+/* BKL pushdown: scary code avoidance wrapper */
+static int tty_open(struct inode *inode, struct file *filp)
+{
+	int ret;
+
+	lock_kernel();
+	ret = __tty_open(inode, filp);
+	unlock_kernel();
+	return ret;
+}
+
+
+
 #ifdef CONFIG_UNIX98_PTYS
 /**
  *	ptmx_open		-	open a unix 98 pty master
@@ -2792,7 +2805,7 @@ got_driver:
  *		allocated_ptys_lock handles the list of free pty numbers
  */
 
-static int ptmx_open(struct inode *inode, struct file *filp)
+static int __ptmx_open(struct inode *inode, struct file *filp)
 {
 	struct tty_struct *tty;
 	int retval;
@@ -2831,6 +2844,16 @@ out:
 	devpts_kill_index(index);
 	return retval;
 }
+
+static int ptmx_open(struct inode *inode, struct file *filp)
+{
+	int ret;
+
+	lock_kernel();
+	ret = __ptmx_open(inode, filp);
+	unlock_kernel();
+	return ret;
+}
 #endif
 
 /**
-- 
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