static int __find_race()

in st-dma-fence-chain.c [390:436]

• 36 lines of code
• 7 McCabe index (conditional complexity)

static int __find_race(void *arg)
{
	struct find_race *data = arg;
	int err = 0;

	while (!kthread_should_stop()) {
		struct dma_fence *fence = dma_fence_get(data->fc.tail);
		int seqno;

		seqno = prandom_u32_max(data->fc.chain_length) + 1;

		err = dma_fence_chain_find_seqno(&fence, seqno);
		if (err) {
			pr_err("Failed to find fence seqno:%d\n",
			       seqno);
			dma_fence_put(fence);
			break;
		}
		if (!fence)
			goto signal;

		/*
		 * We can only find ourselves if we are on fence we were
		 * looking for.
		 */
		if (fence->seqno == seqno) {
			err = dma_fence_chain_find_seqno(&fence, seqno);
			if (err) {
				pr_err("Reported an invalid fence for find-self:%d\n",
				       seqno);
				dma_fence_put(fence);
				break;
			}
		}

		dma_fence_put(fence);

signal:
		seqno = prandom_u32_max(data->fc.chain_length - 1);
		dma_fence_signal(data->fc.fences[seqno]);
		cond_resched();
	}

	if (atomic_dec_and_test(&data->children))
		wake_up_var(&data->children);
	return err;
}