[RFC PATCH 2/2] drm/ttm: skip swapout when ttm has no backend page.

[xinhui pan]

Signed-off-by: xinhui pan <xinhui....@amd.com>
---
 drivers/gpu/drm/ttm/ttm_device.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
index 510e3e001dab..a9772fcc8f9c 100644
--- a/drivers/gpu/drm/ttm/ttm_device.c
+++ b/drivers/gpu/drm/ttm/ttm_device.c
@@ -146,6 +146,7 @@ int ttm_device_swapout(struct ttm_device *bdev, struct 
ttm_operation_ctx *ctx,
                                uint32_t num_pages;
 
                                if (!bo->ttm ||
+                                   !bo->ttm->pages || !bo->ttm->pages[0] ||
                                    bo->ttm->page_flags & TTM_PAGE_FLAG_SG ||
                                    bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)
                                        continue;
-- 
2.25.1