From 9aaf20cbf5b7cccd45495326cba0b35b2884e6b3 Mon Sep 17 00:00:00 2001
From: Jonathan Corbet <corbet@lwn.net>
Date: Fri, 16 May 2008 14:08:58 -0600
Subject: [PATCH] videopix: BKL pushdown

Add explicit lock_kernel() calls to vfc_open().

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
---
 drivers/sbus/char/vfc_dev.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/sbus/char/vfc_dev.c b/drivers/sbus/char/vfc_dev.c
index d4f8fcded5..1f6cb8ae27 100644
--- a/drivers/sbus/char/vfc_dev.c
+++ b/drivers/sbus/char/vfc_dev.c
@@ -24,6 +24,7 @@
 #include <linux/spinlock.h>
 #include <linux/mutex.h>
 #include <linux/mm.h>
+#include <linux/smp_lock.h>
 
 #include <asm/openprom.h>
 #include <asm/oplib.h>
@@ -178,14 +179,17 @@ static int vfc_open(struct inode *inode, struct file *file)
 {
 	struct vfc_dev *dev;
 
+	lock_kernel();
 	spin_lock(&vfc_dev_lock);
 	dev = vfc_get_dev_ptr(iminor(inode));
 	if (dev == NULL) {
 		spin_unlock(&vfc_dev_lock);
+		unlock_kernel();
 		return -ENODEV;
 	}
 	if (dev->busy) {
 		spin_unlock(&vfc_dev_lock);
+		unlock_kernel();
 		return -EBUSY;
 	}
 
@@ -202,6 +206,7 @@ static int vfc_open(struct inode *inode, struct file *file)
 	vfc_captstat_reset(dev);
 	
 	vfc_unlock_device(dev);
+	unlock_kernel();
 	return 0;
 }
 
-- 
2.39.5