wireless: add check of field VHT Extended NSS BW Capable for 160/80+80 MHz setting

Table 9-251—Supported VHT-MCS and NSS Set subfields, it has subfield VHT Extended NSS BW Capable, its definition is:
Indicates whether the STA is capable of interpreting the Extended NSS BW Support subfield of the VHT Capabilities Information field.

This patch is to add check for the subfield.

---
v3: add __le16_to_cpu for __le16 tx_highest
v2: change code style

 net/wireless/chan.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

index 285b8076054b..a2d11c801585 100644
@@ -942,7 +942,7 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
 	struct ieee80211_sta_vht_cap *vht_cap;
 	struct ieee80211_edmg *edmg_cap;
 	u32 width, control_freq, cap;
-	bool support_80_80 = false;
+	bool ext_nss_cap, support_80_80 = false;
 
 	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
 		return false;

@@ -950,6 +950,7 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
 	ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
 	vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
 	edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap;
+	ext_nss_cap = __le16_to_cpu(vht_cap->vht_mcs.tx_highest) & IEEE80211_VHT_EXT_NSS_BW_CAPABLE;
 
 	if (edmg_cap->channels &&
 	    !cfg80211_edmg_usable(wiphy,

@@ -1015,7 +1016,8 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
 			(cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
 			(cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
 			 cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
-			u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1;
+			(ext_nss_cap &&
+			 u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1);
 		if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80)
 			return false;
 		fallthrough;

@@ -1037,7 +1039,7 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
 		cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 		if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
 		    cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
-		    !(vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))
+		    !(ext_nss_cap && (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)))
 			return false;
 		break;
 	default:

2.31.1

I've tested the patch on an xps13 9310 with a 160MHZ wlanrouter with linux 5.12.10 and linux 5.13 rc5. The connection is up, stable and usable at start and but after a random number of minutes (normally within the first 5 minutes) the network connection crashes and it's not possible to connect to any wlan once again. It's also not possible to reload the ath11k_pci module. Only a restart will help, but sometimes the notebook freezes entirely.

How can i help to debug this Problem?

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