From 5e9829ad38c24aa71252e643836e7cedcb1c83d7 Mon Sep 17 00:00:00 2001
From: Jonathan Corbet <corbet@lwn.net>
Date: Fri, 16 May 2008 14:06:45 -0600
Subject: [PATCH] bpp: bkl pushdown

Put explicit lock_kernel() calls into bpp_open().  It has locking, but I'm
not convinced it won't race with ioctl().

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
---
 drivers/sbus/char/bpp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/sbus/char/bpp.c b/drivers/sbus/char/bpp.c
index b87037ec980..c1c091a0057 100644
--- a/drivers/sbus/char/bpp.c
+++ b/drivers/sbus/char/bpp.c
@@ -19,6 +19,7 @@
 #include <linux/timer.h>
 #include <linux/ioport.h>
 #include <linux/major.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -429,6 +430,7 @@ static int bpp_open(struct inode *inode, struct file *f)
       unsigned minor = iminor(inode);
       int ret;
 
+      lock_kernel();
       spin_lock(&bpp_open_lock);
       ret = 0;
       if (minor >= BPP_NO) {
@@ -444,6 +446,7 @@ static int bpp_open(struct inode *inode, struct file *f)
 	      }
       }
       spin_unlock(&bpp_open_lock);
+      unlock_kernel();
 
       return ret;
 }
-- 
2.41.1