The current code does not support establishing MLO connections for
interfaces operating in 4-address AP_VLAN mode.
MLO bringup is blocked by sanity checks in cfg.c, iface.c, and mlme.c,
which prevent MLD initialization when use_4addr is enabled.
Remove these restrictions to allow 4-address AP_VLAN interfaces to
initialize as part of an MLD and successfully participate in MLO
connections. This patch series also adds the necessary changes to
support WDS operation in MLO, making these modifications valid.

Allow 4-address mode interfaces to:
- Proceed with MLD initialization during interface setup
- Add MLO links dynamically via ieee80211_add_intf_link()
- Establish associations with MLO-capable access points
- Support AP_VLAN interfaces with MLO parent APs

Signed-off-by: Tamizh Chelvam Raja <tamizh.raja@oss.qualcomm.com>
---
 net/mac80211/cfg.c   | 7 -------
 net/mac80211/iface.c | 7 -------
 net/mac80211/mlme.c  | 4 ----
 3 files changed, 18 deletions(-)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index e4f28e33400c..ccb41125b969 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -281,10 +281,6 @@ static int ieee80211_change_iface(struct wiphy *wiphy,
 		if (params->use_4addr == ifmgd->use_4addr)
 			return 0;
 
-		/* FIXME: no support for 4-addr MLO yet */
-		if (ieee80211_vif_is_mld(&sdata->vif))
-			return -EOPNOTSUPP;
-
 		sdata->u.mgd.use_4addr = params->use_4addr;
 		if (!ifmgd->associated)
 			return 0;
@@ -5480,9 +5476,6 @@ static int ieee80211_add_intf_link(struct wiphy *wiphy,
 
 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
-	if (wdev->use_4addr)
-		return -EOPNOTSUPP;
-
 	return ieee80211_vif_set_links(sdata, wdev->valid_links, 0);
 }
 
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 125897717a4c..f6c65b88cabd 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -398,13 +398,6 @@ static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 							nsdata->vif.type))
 				return -ENOTUNIQ;
 
-			/* No support for VLAN with MLO yet */
-			if (iftype == NL80211_IFTYPE_AP_VLAN &&
-			    sdata->wdev.use_4addr &&
-			    nsdata->vif.type == NL80211_IFTYPE_AP &&
-			    nsdata->vif.valid_links)
-				return -EOPNOTSUPP;
-
 			/*
 			 * can only add VLANs to enabled APs
 			 */
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 9603fe4b612f..bc61369213f3 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -9858,10 +9858,6 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
 	for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++)
 		size += req->links[i].elems_len;
 
-	/* FIXME: no support for 4-addr MLO yet */
-	if (sdata->u.mgd.use_4addr && req->link_id >= 0)
-		return -EOPNOTSUPP;
-
 	assoc_data = kzalloc(size, GFP_KERNEL);
 	if (!assoc_data)
 		return -ENOMEM;
-- 
2.34.1