ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
				 struct ieee80211_channel *channel,
				 const u8 *country_ie, u8 country_ie_len,
				 const u8 *pwr_constr_elem,
				 int *chan_pwr, int *pwr_reduction)
{
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
	int i, chan_increment;
	bool have_chan_pwr = false;

	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
		return false;

	triplet = (void *)(country_ie + 3);
	country_ie_len -= 3;

	switch (channel->band) {
	default:
		WARN_ON_ONCE(1);
		/* fall through */
	case NL80211_BAND_2GHZ:
	case NL80211_BAND_60GHZ:
		chan_increment = 1;
		break;
	case NL80211_BAND_5GHZ:
		chan_increment = 4;
		break;
	}

	/* find channel */
	while (country_ie_len >= 3) {
		u8 first_channel = triplet->chans.first_channel;

		if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
			goto next;

		for (i = 0; i < triplet->chans.num_channels; i++) {
			if (first_channel + i * chan_increment == chan) {
				have_chan_pwr = true;
				*chan_pwr = triplet->chans.max_power;
				break;
			}
		}
		if (have_chan_pwr)
			break;

 next:
		triplet++;
		country_ie_len -= 3;
	}

	if (have_chan_pwr && pwr_constr_elem)
		*pwr_reduction = *pwr_constr_elem;
	else
		*pwr_reduction = 0;

	return have_chan_pwr;
}
ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
				 struct ieee80211_channel *channel,
				 const u8 *country_ie, u8 country_ie_len,
				 const u8 *pwr_constr_elem,
				 int *chan_pwr, int *pwr_reduction)
{
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
	int i, chan_increment;
	bool have_chan_pwr = false;

	 
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
		return false;

	triplet = (void *)(country_ie + 3);
	country_ie_len -= 3;

	switch (channel->band) {
	default:
		WARN_ON_ONCE(1);
		 
	case NL80211_BAND_2GHZ:
	case NL80211_BAND_60GHZ:
		chan_increment = 1;
		break;
	case NL80211_BAND_5GHZ:
		chan_increment = 4;
		break;
	}

	 
	while (country_ie_len >= 3) {
		u8 first_channel = triplet->chans.first_channel;

		if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
			goto next;

		for (i = 0; i < triplet->chans.num_channels; i++) {
			if (first_channel + i * chan_increment == chan) {
				have_chan_pwr = true;
				*chan_pwr = triplet->chans.max_power;
				break;
			}
		}
		if (have_chan_pwr)
			break;

 next:
		triplet++;
		country_ie_len -= 3;
	}

	if (have_chan_pwr && pwr_constr_elem)
		*pwr_reduction = *pwr_constr_elem;
	else
		*pwr_reduction = 0;

	return have_chan_pwr;
}