[PATCH RESEND] drm/amd/display: avoid using null object of framebuffer

[Ma Ke]

Instead of using state->fb->obj[0] directly, get object from framebuffer
by calling drm_gem_fb_get_obj() and return error code when object is
null to avoid using null object of framebuffer.

Cc: sta...@vger.kernel.org
Fixes: 5d945cbcd4b1 ("drm/amd/display: Create a file dedicated to planes")
Signed-off-by: Ma Ke <mak...@iscas.ac.cn>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c 
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
index a83bd0331c3b..5cb11cc2d063 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
@@ -28,6 +28,7 @@
 #include <drm/drm_blend.h>
 #include <drm/drm_gem_atomic_helper.h>
 #include <drm/drm_plane_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_fourcc.h>
 
 #include "amdgpu.h"
@@ -935,10 +936,14 @@ static int amdgpu_dm_plane_helper_prepare_fb(struct 
drm_plane *plane,
        }
 
        afb = to_amdgpu_framebuffer(new_state->fb);
-       obj = new_state->fb->obj[0];
+       obj = drm_gem_fb_get_obj(new_state->fb, 0);
+       if (!obj) {
+               DRM_ERROR("Failed to get obj from framebuffer\n");
+               return -EINVAL;
+       }
+
        rbo = gem_to_amdgpu_bo(obj);
        adev = amdgpu_ttm_adev(rbo->tbo.bdev);
-
        r = amdgpu_bo_reserve(rbo, true);
        if (r) {
                dev_err(adev->dev, "fail to reserve bo (%d)\n", r);
-- 
2.25.1