mac80211: remove iwlwifi specific workaround that broke sta NDP tx

Sending nulldata packets is important for sw AP link probing and detecting
4-address mode links. The checks that dropped these packets were apparently
added to work around an iwlwifi firmware bug with multi-TID aggregation.

Fixes: 41cbb0f ("mac80211: add support for HE")
Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20210619101517.90806-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/tx.c

@@ -1032,6 +1032,9 @@ static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
 	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_INVALID_STA))
 		return -1;
 
+	if (unlikely(ieee80211_is_any_nullfunc(fc)) && sta->he_cap.has_he)
+		return -1;
+
 	if (unlikely(ieee80211_is_probe_resp(fc)))
 		iwl_mvm_probe_resp_set_noa(mvm, skb);
 

net/mac80211/mlme.c

@@ -1094,11 +1094,6 @@ void ieee80211_send_nullfunc(struct ieee80211_local *local,
 	struct ieee80211_hdr_3addr *nullfunc;
 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 
-	/* Don't send NDPs when STA is connected HE */
-	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
-	    !(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
-		return;
-
 	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif,
 		!ieee80211_hw_check(&local->hw, DOESNT_SUPPORT_QOS_NDP));
 	if (!skb)
@@ -1130,10 +1125,6 @@ static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 		return;
 
-	/* Don't send NDPs when connected HE */
-	if (!(sdata->u.mgd.flags & IEEE80211_STA_DISABLE_HE))
-		return;
-
 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 	if (!skb)
 		return;