vmcp: BKL pushdown

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c
index 2f419b0..bf3dc6e 100644 (file)
--- 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);
 }