diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 7c18a980cd4b..b8f716e61037 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -1079,17 +1079,14 @@ static int drm_stub_open(struct inode *inode, struct file *filp)
 
 	DRM_DEBUG("\n");
 
-	mutex_lock(&drm_global_mutex);
 	minor = drm_minor_acquire(iminor(inode));
-	if (IS_ERR(minor)) {
-		err = PTR_ERR(minor);
-		goto out_unlock;
-	}
+	if (IS_ERR(minor))
+		return PTR_ERR(minor);
 
 	new_fops = fops_get(minor->dev->driver->fops);
 	if (!new_fops) {
 		err = -ENODEV;
-		goto out_release;
+		goto out;
 	}
 
 	replace_fops(filp, new_fops);
@@ -1098,10 +1095,9 @@ static int drm_stub_open(struct inode *inode, struct file *filp)
 	else
 		err = 0;
 
-out_release:
+out:
 	drm_minor_release(minor);
-out_unlock:
-	mutex_unlock(&drm_global_mutex);
+
 	return err;
 }
 
diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
index 1075b3a8b5b1..80d556402ab4 100644
--- a/drivers/gpu/drm/drm_file.c
+++ b/drivers/gpu/drm/drm_file.c
@@ -378,6 +378,8 @@ int drm_open(struct inode *inode, struct file *filp)
 	if (IS_ERR(minor))
 		return PTR_ERR(minor);
 
+	mutex_lock(&drm_global_mutex);
+
 	dev = minor->dev;
 	if (!atomic_fetch_inc(&dev->open_count))
 		need_setup = 1;
@@ -395,10 +397,14 @@ int drm_open(struct inode *inode, struct file *filp)
 			goto err_undo;
 		}
 	}
+
+	mutex_unlock(&drm_global_mutex);
+
 	return 0;
 
 err_undo:
 	atomic_dec(&dev->open_count);
+	mutex_unlock(&drm_global_mutex);
 	drm_minor_release(minor);
 	return retcode;
 }