1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c
index b989748598ae..8137e50ded87 100644
--- a/drivers/input/mousedev.c
+++ b/drivers/input/mousedev.c
@@ -14,6 +14,7 @@
 #define MOUSEDEV_MIX            31
 
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/poll.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -545,16 +546,21 @@ static int mousedev_open(struct inode *inode, struct file *file)
         if (i >= MOUSEDEV_MINORS)
                 return -ENODEV;
 
+        lock_kernel();
         error = mutex_lock_interruptible(&mousedev_table_mutex);
-        if (error)
+        if (error) {
+                unlock_kernel();
                 return error;
+        }
         mousedev = mousedev_table[i];
         if (mousedev)
                 get_device(&mousedev->dev);
         mutex_unlock(&mousedev_table_mutex);
 
-        if (!mousedev)
+        if (!mousedev) {
+                unlock_kernel();
                 return -ENODEV;
+        }
 
         client = kzalloc(sizeof(struct mousedev_client), GFP_KERNEL);
         if (!client) {
@@ -573,6 +579,7 @@ static int mousedev_open(struct inode *inode, struct file *file)
                 goto err_free_client;
 
         file->private_data = client;
+        unlock_kernel();
         return 0;
 
  err_free_client:
@@ -580,6 +587,7 @@ static int mousedev_open(struct inode *inode, struct file *file)
         kfree(client);
  err_put_mousedev:
         put_device(&mousedev->dev);
+        unlock_kernel();
         return error;
 }