From 6c111d886317513605c459cbe8d1970fab732c90 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 20 May 2008 19:16:59 +0200
Subject: [PATCH] vmcp: BKL pushdown

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/s390/char/vmcp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c
index 2f419b0ea6..bf3dc6e0e3 100644
--- a/drivers/s390/char/vmcp.c
+++ b/drivers/s390/char/vmcp.c
@@ -16,6 +16,7 @@
 #include <linux/kernel.h>
 #include <linux/miscdevice.h>
 #include <linux/module.h>
+#include <linux/smp_lock.h>
 #include <asm/cpcmd.h>
 #include <asm/debug.h>
 #include <asm/uaccess.h>
@@ -39,11 +40,14 @@ static int vmcp_open(struct inode *inode, struct file *file)
 	session = kmalloc(sizeof(*session), GFP_KERNEL);
 	if (!session)
 		return -ENOMEM;
+
+	lock_kernel();
 	session->bufsize = PAGE_SIZE;
 	session->response = NULL;
 	session->resp_size = 0;
 	mutex_init(&session->mutex);
 	file->private_data = session;
+	unlock_kernel();
 	return nonseekable_open(inode, file);
 }
 
-- 
2.39.5