static int find_seqno()

in st-dma-fence-chain.c [177:253]

• 70 lines of code
• 12 McCabe index (conditional complexity)

static int find_seqno(void *arg)
{
	struct fence_chains fc;
	struct dma_fence *fence;
	int err;
	int i;

	err = fence_chains_init(&fc, 64, seqno_inc);
	if (err)
		return err;

	fence = dma_fence_get(fc.tail);
	err = dma_fence_chain_find_seqno(&fence, 0);
	dma_fence_put(fence);
	if (err) {
		pr_err("Reported %d for find_seqno(0)!\n", err);
		goto err;
	}

	for (i = 0; i < fc.chain_length; i++) {
		fence = dma_fence_get(fc.tail);
		err = dma_fence_chain_find_seqno(&fence, i + 1);
		dma_fence_put(fence);
		if (err) {
			pr_err("Reported %d for find_seqno(%d:%d)!\n",
			       err, fc.chain_length + 1, i + 1);
			goto err;
		}
		if (fence != fc.chains[i]) {
			pr_err("Incorrect fence reported by find_seqno(%d:%d)\n",
			       fc.chain_length + 1, i + 1);
			err = -EINVAL;
			goto err;
		}

		dma_fence_get(fence);
		err = dma_fence_chain_find_seqno(&fence, i + 1);
		dma_fence_put(fence);
		if (err) {
			pr_err("Error reported for finding self\n");
			goto err;
		}
		if (fence != fc.chains[i]) {
			pr_err("Incorrect fence reported by find self\n");
			err = -EINVAL;
			goto err;
		}

		dma_fence_get(fence);
		err = dma_fence_chain_find_seqno(&fence, i + 2);
		dma_fence_put(fence);
		if (!err) {
			pr_err("Error not reported for future fence: find_seqno(%d:%d)!\n",
			       i + 1, i + 2);
			err = -EINVAL;
			goto err;
		}

		dma_fence_get(fence);
		err = dma_fence_chain_find_seqno(&fence, i);
		dma_fence_put(fence);
		if (err) {
			pr_err("Error reported for previous fence!\n");
			goto err;
		}
		if (i > 0 && fence != fc.chains[i - 1]) {
			pr_err("Incorrect fence reported by find_seqno(%d:%d)\n",
			       i + 1, i);
			err = -EINVAL;
			goto err;
		}
	}

err:
	fence_chains_fini(&fc);
	return err;
}