On 2016年07月14日 05:07, Yaniv Machani wrote:

+
+	/* if channel width is 20MHz - configure HT capab accordingly*/
+	if (sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20) {
+		cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
+		cap &= ~IEEE80211_HT_CAP_DSSSCCK40;
+	}

I have tested this part of your patch and this works for me.

Previouly, "Supported Channel Width Set bit" in HT Capabilities element
was 1 even though disable_ht40=1 existed in wpa_supplicant.conf.
After appllication of patch, the bit was 0.