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drm/amdgpu: sanitize fence numbers 

Looks like the VCE block sometimes still sends nonsense
fence numbers on startup.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2016-06-24 21:11:51 +02:00 committed by Alex Deucher
parent 737a44b106
commit 4f399a0828
1 changed files with 8 additions and 2 deletions
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drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
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@ -204,16 +204,22 @@ void amdgpu_fence_process(struct amdgpu_ring *ring)
if (seq != ring->fence_drv.sync_seq)
amdgpu_fence_schedule_fallback(ring);
last_seq &= drv->num_fences_mask;
seq &= drv->num_fences_mask;
while (last_seq != seq) {
struct fence *fence, **ptr;
ptr = &drv->fences[++last_seq & drv->num_fences_mask];
++last_seq;
last_seq &= drv->num_fences_mask;
ptr = &drv->fences[last_seq];
/* There is always exactly one thread signaling this fence slot */
fence = rcu_dereference_protected(*ptr, 1);
RCU_INIT_POINTER(*ptr, NULL);
BUG_ON(!fence);
if (!fence)
continue;
r = fence_signal(fence);
if (!r)