RE: [PATCH 6/6] drm/amdgpu: Fix driver unload issue

["Chen, Jiansong (Simon)" <Jiansong.Chen@xxxxxxx>]

[AMD Official Use Only - Internal Distribution Only]

I still wonder how the issue takes place? According to my humble knowledge in driver model, the reference count of the kobject
for the device will not reach zero when there is still some device mem access, and shutdown should not happen.

Regards,
Jiansong
-----Original Message-----
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Emily Deng
Sent: Tuesday, March 30, 2021 12:42 PM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Deng, Emily <Emily.Deng@xxxxxxx>
Subject: [PATCH 6/6] drm/amdgpu: Fix driver unload issue

During driver unloading, don't need to copy mem, or it will introduce some call trace, such as when sa_manager is freed, it will introduce warn call trace in amdgpu_sa_bo_new.

Signed-off-by: Emily Deng <Emily.Deng@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index e00263bcc88b..f0546a489e0d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -317,6 +317,9 @@ int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev,
 struct dma_fence *fence = NULL;
 int r = 0;

+if (adev->shutdown)
+return 0;
+
 if (!adev->mman.buffer_funcs_enabled) {
 DRM_ERROR("Trying to move memory with ring turned off.\n");
 return -EINVAL;
--
2.25.1

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