int reset_control_assert()

in core.c [441:485]

• 28 lines of code
• 11 McCabe index (conditional complexity)

int reset_control_assert(struct reset_control *rstc)
{
	if (!rstc)
		return 0;

	if (WARN_ON(IS_ERR(rstc)))
		return -EINVAL;

	if (reset_control_is_array(rstc))
		return reset_control_array_assert(rstc_to_array(rstc));

	if (rstc->shared) {
		if (WARN_ON(atomic_read(&rstc->triggered_count) != 0))
			return -EINVAL;

		if (WARN_ON(atomic_read(&rstc->deassert_count) == 0))
			return -EINVAL;

		if (atomic_dec_return(&rstc->deassert_count) != 0)
			return 0;

		/*
		 * Shared reset controls allow the reset line to be in any state
		 * after this call, so doing nothing is a valid option.
		 */
		if (!rstc->rcdev->ops->assert)
			return 0;
	} else {
		/*
		 * If the reset controller does not implement .assert(), there
		 * is no way to guarantee that the reset line is asserted after
		 * this call.
		 */
		if (!rstc->rcdev->ops->assert)
			return -ENOTSUPP;

		if (!rstc->acquired) {
			WARN(1, "reset %s (ID: %u) is not acquired\n",
			     rcdev_name(rstc->rcdev), rstc->id);
			return -EPERM;
		}
	}

	return rstc->rcdev->ops->assert(rstc->rcdev, rstc->id);
}