diff --git a/[refs] b/[refs]
index 363e9617e59e..c9aa0d704237 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8702965848ed4bee27486a3e3d2ae34ebba6dd83
+refs/heads/master: 78dccb46ddc2ff460c8b4d5ec0886964bd4b59e5
diff --git a/trunk/arch/um/drivers/harddog_kern.c b/trunk/arch/um/drivers/harddog_kern.c
index a9ad4bd6d953..d332503fa1be 100644
--- a/trunk/arch/um/drivers/harddog_kern.c
+++ b/trunk/arch/um/drivers/harddog_kern.c
@@ -66,6 +66,7 @@ static int harddog_open(struct inode *inode, struct file *file)
 	int err = -EBUSY;
 	char *sock = NULL;
 
+	lock_kernel();
 	spin_lock(&lock);
 	if(timer_alive)
 		goto err;
@@ -82,9 +83,11 @@ static int harddog_open(struct inode *inode, struct file *file)
 
 	timer_alive = 1;
 	spin_unlock(&lock);
+	unlock_kernel();
 	return nonseekable_open(inode, file);
 err:
 	spin_unlock(&lock);
+	unlock_kernel();
 	return err;
 }