A PHY supporting 160Mhz with a reduced number of NSS may not have any of the IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK bits set. For exemple, the QCA9984 is 4x4, but can only do 2x2 VHT160 or 80+80. The corresponding VHT capabilities should be: - IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK == 0 - Extended NSS BW == 2 If we use that hardware in AP mode, and a 160Mhz 2x2 STA without NSS restriction connects to it, then that STA will set IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK to 1. The usual logic of using bitwise-and with our own capabilities does not work here, the current code clears the SUPP_CHAN_WIDTH bits and resolve STA bandwidth to 80Mhz instead of 160Mhz, fix this. Signed-off-by: Maxime Bizon <mbizon@xxxxxxxxxx> --- net/mac80211/vht.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/mac80211/vht.c b/net/mac80211/vht.c index e856f9092137..7ef93adc4f24 100644 --- a/net/mac80211/vht.c +++ b/net/mac80211/vht.c @@ -230,9 +230,11 @@ ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata, sizeof(struct ieee80211_vht_mcs_info)); /* copy EXT_NSS_BW Support value or remove the capability */ - if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_VHT_EXT_NSS_BW)) + if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_VHT_EXT_NSS_BW)) { + vht_cap->cap |= cap_info & + IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; vht_cap->cap |= (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK); - else + } else vht_cap->vht_mcs.tx_highest &= ~cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE); -- 2.17.1