openprom: BKL pushdown

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

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/sbus/char/openprom.c b/drivers/sbus/char/openprom.c
index fbfeb89a6f32..29dc735e1a20 100644
--- a/drivers/sbus/char/openprom.c
+++ b/drivers/sbus/char/openprom.c
@@ -33,6 +33,7 @@
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/string.h>
 #include <linux/miscdevice.h>
 #include <linux/init.h>
@@ -689,9 +690,11 @@ static int openprom_open(struct inode * inode, struct file * file)
         if (!data)
                 return -ENOMEM;
 
+        lock_kernel();
         data->current_node = of_find_node_by_path("/");
         data->lastnode = data->current_node;
         file->private_data = (void *) data;
+        unlock_kernel();
 
         return 0;
 }