This is a note to let you know that I've just added the patch titled
drm/amdgpu: fix dropped backing store handling in amdgpu_dma_buf_move_notify
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amdgpu-fix-dropped-backing-store-handling-in-amd.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 71ed39757c11d6d7be2eea0bf579aa57c6e1a3e3
Author: Christian König <ckoenig.leichtzumerken@xxxxxxxxx>
Date: Fri Dec 10 09:39:27 2021 +0100
drm/amdgpu: fix dropped backing store handling in amdgpu_dma_buf_move_notify
[ Upstream commit fc74881c28d314b10efac016ef49df4ff40b8b97 ]
bo->tbo.resource can now be NULL.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1811
Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20211210083927.1754-1-christian.koenig@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
index ae6ab93c868b8..7444484a12bf8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
@@ -384,7 +384,7 @@ amdgpu_dma_buf_move_notify(struct dma_buf_attachment *attach)
struct amdgpu_vm_bo_base *bo_base;
int r;
- if (bo->tbo.resource->mem_type == TTM_PL_SYSTEM)
+ if (!bo->tbo.resource || bo->tbo.resource->mem_type == TTM_PL_SYSTEM)
return;
r = ttm_bo_validate(&bo->tbo, &placement, &ctx);
