[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20230724012334.2317140-13-sashal@kernel.org>
Date: Sun, 23 Jul 2023 21:23:24 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Lang Yu <Lang.Yu@....com>,
Christian König <christian.koenig@....com>,
Alex Deucher <alexander.deucher@....com>,
Sasha Levin <sashal@...nel.org>, David1.Zhou@....com,
airlied@...ux.ie, bas@...nieuwenhuizen.nl,
gregkh@...uxfoundation.org, amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.15 13/23] drm/amdgpu: install stub fence into potential unused fence pointers
From: Lang Yu <Lang.Yu@....com>
[ Upstream commit 187916e6ed9d0c3b3abc27429f7a5f8c936bd1f0 ]
When using cpu to update page tables, vm update fences are unused.
Install stub fence into these fence pointers instead of NULL
to avoid NULL dereference when calling dma_fence_wait() on them.
Suggested-by: Christian König <christian.koenig@....com>
Signed-off-by: Lang Yu <Lang.Yu@....com>
Reviewed-by: Christian König <christian.koenig@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 924c6d5f86203..362fd43313552 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2260,6 +2260,7 @@ struct amdgpu_bo_va *amdgpu_vm_bo_add(struct amdgpu_device *adev,
amdgpu_vm_bo_base_init(&bo_va->base, vm, bo);
bo_va->ref_count = 1;
+ bo_va->last_pt_update = dma_fence_get_stub();
INIT_LIST_HEAD(&bo_va->valids);
INIT_LIST_HEAD(&bo_va->invalids);
@@ -2962,7 +2963,8 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm)
vm->update_funcs = &amdgpu_vm_cpu_funcs;
else
vm->update_funcs = &amdgpu_vm_sdma_funcs;
- vm->last_update = NULL;
+
+ vm->last_update = dma_fence_get_stub();
vm->last_unlocked = dma_fence_get_stub();
mutex_init(&vm->eviction_lock);
@@ -3105,7 +3107,7 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm)
vm->update_funcs = &amdgpu_vm_sdma_funcs;
}
dma_fence_put(vm->last_update);
- vm->last_update = NULL;
+ vm->last_update = dma_fence_get_stub();
vm->is_compute_context = true;
/* Free the shadow bo for compute VM */
--
2.39.2
Powered by blists - more mailing lists