static int __hwspin_lock_request()

in hwspinlock_core.c [646:677]

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

static int __hwspin_lock_request(struct hwspinlock *hwlock)
{
	struct device *dev = hwlock->bank->dev;
	struct hwspinlock *tmp;
	int ret;

	/* prevent underlying implementation from being removed */
	if (!try_module_get(dev->driver->owner)) {
		dev_err(dev, "%s: can't get owner\n", __func__);
		return -EINVAL;
	}

	/* notify PM core that power is now needed */
	ret = pm_runtime_get_sync(dev);
	if (ret < 0 && ret != -EACCES) {
		dev_err(dev, "%s: can't power on device\n", __func__);
		pm_runtime_put_noidle(dev);
		module_put(dev->driver->owner);
		return ret;
	}

	ret = 0;

	/* mark hwspinlock as used, should not fail */
	tmp = radix_tree_tag_clear(&hwspinlock_tree, hwlock_to_id(hwlock),
							HWSPINLOCK_UNUSED);

	/* self-sanity check that should never fail */
	WARN_ON(tmp != hwlock);

	return ret;
}