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drm/amdgpu: RCU protected amdgpu_fence_release

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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>
This commit is contained in:
Christian König 2016-03-15 13:40:17 +01:00 committed by Alex Deucher
parent ca08e04d56
commit b44135351a
1 changed files with 22 additions and 1 deletions
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23
drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
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@ -638,12 +638,33 @@ static bool amdgpu_fence_enable_signaling(struct fence *f)
return true;
}
static void amdgpu_fence_release(struct fence *f)
/**
* amdgpu_fence_free - free up the fence memory
*
* @rcu: RCU callback head
*
* Free up the fence memory after the RCU grace period.
*/
static void amdgpu_fence_free(struct rcu_head *rcu)
{
struct fence *f = container_of(rcu, struct fence, rcu);
struct amdgpu_fence *fence = to_amdgpu_fence(f);
kmem_cache_free(amdgpu_fence_slab, fence);
}
/**
* amdgpu_fence_release - callback that fence can be freed
*
* @fence: fence
*
* This function is called when the reference count becomes zero.
* It just RCU schedules freeing up the fence.
*/
static void amdgpu_fence_release(struct fence *f)
{
call_rcu(&f->rcu, amdgpu_fence_free);
}
static const struct fence_ops amdgpu_fence_ops = {
.get_driver_name = amdgpu_fence_get_driver_name,
.get_timeline_name = amdgpu_fence_get_timeline_name,