[PATCH 6/9] drm/i915/gvt: Add missing module_put() in error unwind

[Jason Gunthorpe]

try_module_get() must be undone if kvmgt_guest_init() fails or we leak the
module reference count on the failure path since the close_device op is
never called in this case.

Fixes: 9bdb073464d6 ("drm/i915/gvt: Change KVMGT as self load module")
Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
---
 drivers/gpu/drm/i915/gvt/kvmgt.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 3302d5d4d92146..d7c22a2601f3ad 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -952,13 +952,16 @@ static int intel_vgpu_open_device(struct mdev_device *mdev)
 
 	ret = kvmgt_guest_init(mdev);
 	if (ret)
-		goto undo_group;
+		goto undo_module_get;
 
 	intel_gvt_ops->vgpu_activate(vgpu);
 
 	atomic_set(&vdev->released, 0);
 	return ret;
 
+undo_module_get:
+	module_put(THIS_MODULE);
+
 undo_group:
 	vfio_group_put_external_user(vdev->vfio_group);
 	vdev->vfio_group = NULL;
-- 
2.35.1