[PATCH AUTOSEL 4.9 2/2] drm/nouveau: fix dma_address check for CPU/GPU sync

From: Sasha Levin
Date: Mon Jun 28 2021 - 17:25:57 EST


From: Christian König <christian.koenig@xxxxxxx>

[ Upstream commit d330099115597bbc238d6758a4930e72b49ea9ba ]

AGP for example doesn't have a dma_address array.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20210614110517.1624-1-christian.koenig@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/nouveau/nouveau_bo.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index a2e6a81669e7..94b7798bdea4 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -447,7 +447,7 @@ nouveau_bo_sync_for_device(struct nouveau_bo *nvbo)
struct ttm_dma_tt *ttm_dma = (struct ttm_dma_tt *)nvbo->bo.ttm;
int i;

- if (!ttm_dma)
+ if (!ttm_dma || !ttm_dma->dma_address)
return;

/* Don't waste time looping if the object is coherent */
@@ -467,7 +467,7 @@ nouveau_bo_sync_for_cpu(struct nouveau_bo *nvbo)
struct ttm_dma_tt *ttm_dma = (struct ttm_dma_tt *)nvbo->bo.ttm;
int i;

- if (!ttm_dma)
+ if (!ttm_dma || !ttm_dma->dma_address)
return;

/* Don't waste time looping if the object is coherent */
--
2.30.2