static ssize_t power_state_store()

in interface.c [525:568]

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

static ssize_t power_state_store(struct device *dev,
				 struct device_attribute *attr, const char *buf,
				 size_t len)
{
	struct gb_interface *intf = to_gb_interface(dev);
	bool activate;
	int ret = 0;

	if (kstrtobool(buf, &activate))
		return -EINVAL;

	mutex_lock(&intf->mutex);

	if (activate == intf->active)
		goto unlock;

	if (activate) {
		ret = gb_interface_activate(intf);
		if (ret) {
			dev_err(&intf->dev,
				"failed to activate interface: %d\n", ret);
			goto unlock;
		}

		ret = gb_interface_enable(intf);
		if (ret) {
			dev_err(&intf->dev,
				"failed to enable interface: %d\n", ret);
			gb_interface_deactivate(intf);
			goto unlock;
		}
	} else {
		gb_interface_disable(intf);
		gb_interface_deactivate(intf);
	}

unlock:
	mutex_unlock(&intf->mutex);

	if (ret)
		return ret;

	return len;
}