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drm/amdgpu: RCU protected amd_sched_fence_release
Fences must be freed RCU protected, otherwise the reservation_object_*_rcu() functions can run into problems. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
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1 changed files with 22 additions and 1 deletions
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@ -84,12 +84,33 @@ static bool amd_sched_fence_enable_signaling(struct fence *f)
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return true;
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}
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static void amd_sched_fence_release(struct fence *f)
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/**
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* amd_sched_fence_free - free up the fence memory
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*
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* @rcu: RCU callback head
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*
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* Free up the fence memory after the RCU grace period.
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*/
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static void amd_sched_fence_free(struct rcu_head *rcu)
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{
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struct fence *f = container_of(rcu, struct fence, rcu);
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struct amd_sched_fence *fence = to_amd_sched_fence(f);
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kmem_cache_free(sched_fence_slab, fence);
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}
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/**
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* amd_sched_fence_release - callback that fence can be freed
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*
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* @fence: fence
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*
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* This function is called when the reference count becomes zero.
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* It just RCU schedules freeing up the fence.
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*/
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static void amd_sched_fence_release(struct fence *f)
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{
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call_rcu(&f->rcu, amd_sched_fence_free);
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}
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const struct fence_ops amd_sched_fence_ops = {
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.get_driver_name = amd_sched_fence_get_driver_name,
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.get_timeline_name = amd_sched_fence_get_timeline_name,
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