[PATCH 5.12 076/127] drm/radeon: use the dummy page for GART if needed

[Greg Kroah-Hartman]

From: Christian König <christian.koenig@xxxxxxx>

commit 0c8df343c200529e6b9820bdfed01814140f75e4 upstream.

Imported BOs don't have a pagelist any more.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Fixes: 0575ff3d33cd ("drm/radeon: stop using pages with drm_prime_sg_to_page_addr_arrays v2")
CC: stable@xxxxxxxxxxxxxxx # 5.12
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/radeon/radeon_gart.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/radeon/radeon_gart.c
+++ b/drivers/gpu/drm/radeon/radeon_gart.c
@@ -301,7 +301,8 @@ int radeon_gart_bind(struct radeon_devic
 	p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);
 
 	for (i = 0; i < pages; i++, p++) {
-		rdev->gart.pages[p] = pagelist[i];
+		rdev->gart.pages[p] = pagelist ? pagelist[i] :
+			rdev->dummy_page.page;
 		page_base = dma_addr[i];
 		for (j = 0; j < (PAGE_SIZE / RADEON_GPU_PAGE_SIZE); j++, t++) {
 			page_entry = radeon_gart_get_page_entry(page_base, flags);