diff --git a/[refs] b/[refs]
index ffd3a2645fe7..b4afbb4e567d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: dca67e9d3db27b090259b696e1166615f40099e2
+refs/heads/master: f9c8154f367d471f1af56742fe8534f8458adb98
diff --git a/trunk/drivers/input/mousedev.c b/trunk/drivers/input/mousedev.c
index b989748598ae..8137e50ded87 100644
--- a/trunk/drivers/input/mousedev.c
+++ b/trunk/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;
 }