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drm/amdgpu: fix fence slab teardown

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To free fences, call_rcu() is used, which calls amdgpu_fence_free()
after a grace period. During teardown, there is no guarantee all
callbacks have finished, so amdgpu_fence_slab may be destroyed before
all fences have been freed. If we are lucky, this results in some slab
warnings, if not, we get a crash in one of rcu threads because callback
is called after amdgpu has already been unloaded.

Fix it with a rcu_barrier().

Fixes: b44135351a ("drm/amdgpu: RCU protected amdgpu_fence_release")
Acked-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Grazvydas Ignotas 2016-10-23 21:31:43 +03:00 committed by Alex Deucher
parent 9566213359
commit 0f10425e81
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
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@ -68,6 +68,7 @@ int amdgpu_fence_slab_init(void)
void amdgpu_fence_slab_fini(void) void amdgpu_fence_slab_fini(void)
{ {
rcu_barrier();
kmem_cache_destroy(amdgpu_fence_slab); kmem_cache_destroy(amdgpu_fence_slab);
} }
/* /*