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drm/amdgpu: fence wait old rcu slot

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since the rcu slot was initialized to be num_hw_submission,
if command submission doesn't use scheduler, this limitation
will be invalid like uvd test.

Signed-off-by: Chunming Zhou <[email protected]>
Reviewed-by: Christian König <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
This commit is contained in:
Chunming Zhou 2016-03-31 11:07:14 +08:00 • committed by Alex Deucher
commit fc387a0b18
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
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@ -121,7 +121,7 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct fence **f)
{
struct amdgpu_device *adev = ring->adev;
struct amdgpu_fence *fence;
struct fence **ptr;
struct fence *old, **ptr;
uint32_t seq;
fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_KERNEL);
@ -141,7 +141,11 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct fence **f)
/* This function can't be called concurrently anyway, otherwise
* emitting the fence would mess up the hardware ring buffer.
*/
BUG_ON(rcu_dereference_protected(*ptr, 1));
old = rcu_dereference_protected(*ptr, 1);
if (old && !fence_is_signaled(old)) {
DRM_INFO("rcu slot is busy\n");
fence_wait(old, false);
}
rcu_assign_pointer(*ptr, fence_get(&fence->base));