[PATCH] mock a drm_plane in igt_check_plane_state to make the test more robust

[Claudio Suarez]

igt_check_plane_state test crashes in drm_atomic_helper_check_plane_state
when trying to de-reference drm_plane_state->plane->dev
due to the lack of a struct drm_plane in the mock struct drm_plane_state.
Since drm_plane_state always should contain a plane, the mock also
needs a plane to be the test more robust and realistic. Add it.

Signed-off-by: Claudio Suarez <c...@net-c.es>
---
 drivers/gpu/drm/selftests/test-drm_plane_helper.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/selftests/test-drm_plane_helper.c 
b/drivers/gpu/drm/selftests/test-drm_plane_helper.c
index 0a9553f51796..ceebeede55ea 100644
--- a/drivers/gpu/drm/selftests/test-drm_plane_helper.c
+++ b/drivers/gpu/drm/selftests/test-drm_plane_helper.c
@@ -87,11 +87,15 @@ int igt_check_plane_state(void *ignored)
                                DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC)
                },
        };
+       struct drm_plane plane = {
+               .dev = NULL
+       };
        struct drm_framebuffer fb = {
                .width = 2048,
                .height = 2048
        };
        struct drm_plane_state plane_state = {
+               .plane = &plane,
                .crtc = ZERO_SIZE_PTR,
                .fb = &fb,
                .rotation = DRM_MODE_ROTATE_0
-- 
2.33.0