1 files changed, 3 insertions, 0 deletions

diff --git a/arch/um/drivers/harddog_kern.c b/arch/um/drivers/harddog_kern.c
index a9ad4bd6d953..d332503fa1be 100644
--- a/arch/um/drivers/harddog_kern.c
+++ b/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;
 }