Re: [PATCH] drm/ttm: fix missing NULL check in ttm_device_swapout

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Am 2022-06-03 um 06:46 schrieb Christian König:
Resources about to be destructed are not tied to BOs any more.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>

Reviewed-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>


---
  drivers/gpu/drm/ttm/ttm_device.c | 6 +++++-
  1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
index a0562ab386f5..e7147e304637 100644
--- a/drivers/gpu/drm/ttm/ttm_device.c
+++ b/drivers/gpu/drm/ttm/ttm_device.c
@@ -156,8 +156,12 @@ int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
ttm_resource_manager_for_each_res(man, &cursor, res) {
  			struct ttm_buffer_object *bo = res->bo;
-			uint32_t num_pages = PFN_UP(bo->base.size);
+			uint32_t num_pages;
+ if (!bo)
+				continue;
+
+			num_pages = PFN_UP(bo->base.size);
  			ret = ttm_bo_swapout(bo, ctx, gfp_flags);
  			/* ttm_bo_swapout has dropped the lru_lock */
  			if (!ret)



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