void dma_resv_add_shared_fence()

in dma-resv.c [249:284]

• 26 lines of code
• 4 McCabe index (conditional complexity)

void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence)
{
	struct dma_resv_list *fobj;
	struct dma_fence *old;
	unsigned int i, count;

	dma_fence_get(fence);

	dma_resv_assert_held(obj);

	fobj = dma_resv_shared_list(obj);
	count = fobj->shared_count;

	write_seqcount_begin(&obj->seq);

	for (i = 0; i < count; ++i) {

		old = rcu_dereference_protected(fobj->shared[i],
						dma_resv_held(obj));
		if (old->context == fence->context ||
		    dma_fence_is_signaled(old))
			goto replace;
	}

	BUG_ON(fobj->shared_count >= fobj->shared_max);
	old = NULL;
	count++;

replace:
	RCU_INIT_POINTER(fobj->shared[i], fence);
	/* pointer update must be visible before we extend the shared_count */
	smp_store_mb(fobj->shared_count, count);

	write_seqcount_end(&obj->seq);
	dma_fence_put(old);
}