diff --git a/[refs] b/[refs]
index bd4fa1b95f1c..d33ec5315937 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ffe83733b88655b643e9d4ad0dda5ef9584d5926
+refs/heads/master: 6c111d886317513605c459cbe8d1970fab732c90
diff --git a/trunk/drivers/s390/char/vmcp.c b/trunk/drivers/s390/char/vmcp.c
index 2f419b0ea628..bf3dc6e0e33a 100644
--- a/trunk/drivers/s390/char/vmcp.c
+++ b/trunk/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);
 }