int reset_control_acquire()

in core.c [639:672]

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

int reset_control_acquire(struct reset_control *rstc)
{
	struct reset_control *rc;

	if (!rstc)
		return 0;

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

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

	mutex_lock(&reset_list_mutex);

	if (rstc->acquired) {
		mutex_unlock(&reset_list_mutex);
		return 0;
	}

	list_for_each_entry(rc, &rstc->rcdev->reset_control_head, list) {
		if (rstc != rc && rstc->id == rc->id) {
			if (rc->acquired) {
				mutex_unlock(&reset_list_mutex);
				return -EBUSY;
			}
		}
	}

	rstc->acquired = true;

	mutex_unlock(&reset_list_mutex);
	return 0;
}