1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/char/apm-emulation.c b/drivers/char/apm-emulation.c
index cdd876dbb2b0..da8a1658a273 100644
--- a/drivers/char/apm-emulation.c
+++ b/drivers/char/apm-emulation.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/poll.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/miscdevice.h>
@@ -416,6 +417,7 @@ static int apm_open(struct inode * inode, struct file * filp)
 {
         struct apm_user *as;
 
+        lock_kernel();
         as = kzalloc(sizeof(*as), GFP_KERNEL);
         if (as) {
                 /*
@@ -435,6 +437,7 @@ static int apm_open(struct inode * inode, struct file * filp)
 
                 filp->private_data = as;
         }
+        unlock_kernel();
 
         return as ? 0 : -ENOMEM;
 }