diff options
| author | Chunming Zhou <david1.zhou@amd.com> | 2015-07-24 10:49:47 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2015-08-17 16:50:38 -0400 |
| commit | 176e1ab1b534368d0cd338a010aaea99067c3c6e (patch) | |
| tree | 4a30358b9d603cf62eded5032665816ec3d2de97 /drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | |
| parent | e0d8f3c34e54b7f7563360131e89be0d9405d436 (diff) | |
drm/amdgpu: protect fence_process from multiple context
fence_process may be called from kthread, user thread and interrupt context.
it is possible to called concurrently, then will wake up fence queue multiple times.
Signed-off-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c index 1580d8d7a3bf..b0e15b574606 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c @@ -295,6 +295,7 @@ void amdgpu_fence_process(struct amdgpu_ring *ring) uint64_t seq, last_seq, last_emitted; unsigned count_loop = 0; bool wake = false; + unsigned long irqflags; /* Note there is a scenario here for an infinite loop but it's * very unlikely to happen. For it to happen, the current polling @@ -317,6 +318,7 @@ void amdgpu_fence_process(struct amdgpu_ring *ring) * have temporarly set the last_seq not to the true real last * seq but to an older one. */ + spin_lock_irqsave(&ring->fence_lock, irqflags); last_seq = atomic64_read(&ring->fence_drv.last_seq); do { last_emitted = ring->fence_drv.sync_seq[ring->idx]; @@ -355,7 +357,7 @@ void amdgpu_fence_process(struct amdgpu_ring *ring) if (handled_seq == latest_seq) { DRM_ERROR("ring %d, EOP without seq update (lastest_seq=%llu)\n", ring->idx, latest_seq); - return; + goto exit; } do { amd_sched_isr(ring->scheduler); @@ -364,6 +366,8 @@ void amdgpu_fence_process(struct amdgpu_ring *ring) wake_up_all(&ring->adev->fence_queue); } +exit: + spin_unlock_irqrestore(&ring->fence_lock, irqflags); } /** |