mwifiex: fix incorrect ht capability problem

IEEE80211_CHAN_NO_HT40PLUS and IEEE80211_CHAN_NO_HT40PLUS channel
flags tell if HT40 operation is allowed on a channel or not.

This patch ensures ht_capability information is modified
accordingly so that we don't end up creating a HT40 connection
when it's not allowed for current regulatory domain.
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Ganapathi Bhat <gbhat@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/11n.c

@@ -341,6 +341,36 @@ mwifiex_cmd_append_11n_tlv(struct mwifiex_private *priv,
 		       le16_to_cpu(ht_cap->header.len));
 
 		mwifiex_fill_cap_info(priv, radio_type, &ht_cap->ht_cap);
+		/* Update HT40 capability from current channel information */
+		if (bss_desc->bcn_ht_oper) {
+			u8 ht_param = bss_desc->bcn_ht_oper->ht_param;
+			u8 radio =
+			mwifiex_band_to_radio_type(bss_desc->bss_band);
+			int freq =
+			ieee80211_channel_to_frequency(bss_desc->channel,
+						       radio);
+			struct ieee80211_channel *chan =
+			ieee80211_get_channel(priv->adapter->wiphy, freq);
+
+			switch (ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
+			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
+				if (chan->flags & IEEE80211_CHAN_NO_HT40PLUS) {
+					ht_cap->ht_cap.cap_info &=
+					~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
+					ht_cap->ht_cap.cap_info &=
+					~IEEE80211_HT_CAP_SGI_40;
+				}
+				break;
+			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
+				if (chan->flags & IEEE80211_CHAN_NO_HT40MINUS) {
+					ht_cap->ht_cap.cap_info &=
+					~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
+					ht_cap->ht_cap.cap_info &=
+					~IEEE80211_HT_CAP_SGI_40;
+				}
+				break;
+			}
+		}
 
 		*buffer += sizeof(struct mwifiex_ie_types_htcap);
 		ret_len += sizeof(struct mwifiex_ie_types_htcap);