int extcon_sync()

in extcon.c [408:479]

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

int extcon_sync(struct extcon_dev *edev, unsigned int id)
{
	char name_buf[120];
	char state_buf[120];
	char *prop_buf;
	char *envp[3];
	int env_offset = 0;
	int length;
	int index;
	int state;
	unsigned long flags;

	if (!edev)
		return -EINVAL;

	index = find_cable_index_by_id(edev, id);
	if (index < 0)
		return index;

	spin_lock_irqsave(&edev->lock, flags);
	state = !!(edev->state & BIT(index));
	spin_unlock_irqrestore(&edev->lock, flags);

	/*
	 * Call functions in a raw notifier chain for the specific one
	 * external connector.
	 */
	raw_notifier_call_chain(&edev->nh[index], state, edev);

	/*
	 * Call functions in a raw notifier chain for the all supported
	 * external connectors.
	 */
	raw_notifier_call_chain(&edev->nh_all, state, edev);

	spin_lock_irqsave(&edev->lock, flags);
	/* This could be in interrupt handler */
	prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
	if (!prop_buf) {
		/* Unlock early before uevent */
		spin_unlock_irqrestore(&edev->lock, flags);

		dev_err(&edev->dev, "out of memory in extcon_set_state\n");
		kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);

		return -ENOMEM;
	}

	length = name_show(&edev->dev, NULL, prop_buf);
	if (length > 0) {
		if (prop_buf[length - 1] == '\n')
			prop_buf[length - 1] = 0;
		snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf);
		envp[env_offset++] = name_buf;
	}

	length = state_show(&edev->dev, NULL, prop_buf);
	if (length > 0) {
		if (prop_buf[length - 1] == '\n')
			prop_buf[length - 1] = 0;
		snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf);
		envp[env_offset++] = state_buf;
	}
	envp[env_offset] = NULL;

	/* Unlock early before uevent */
	spin_unlock_irqrestore(&edev->lock, flags);
	kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
	free_page((unsigned long)prop_buf);

	return 0;
}