diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 882fb5d2517f..71bcee3a8d59 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -727,7 +727,7 @@ struct mt76_dev {
 	u32 wcid_mask[DIV_ROUND_UP(MT76_N_WCIDS, 32)];
 	u32 wcid_phy_mask[DIV_ROUND_UP(MT76_N_WCIDS, 32)];
 
-	u32 vif_mask;
+	u64 vif_mask;
 
 	struct mt76_wcid global_wcid;
 	struct mt76_wcid __rcu *wcid[MT76_N_WCIDS];
diff --git a/drivers/net/wireless/mediatek/mt76/mt7603/main.c b/drivers/net/wireless/mediatek/mt76/mt7603/main.c
index 83c5eec5b163..86ddab140207 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7603/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7603/main.c
@@ -44,7 +44,7 @@ mt7603_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 
 	mutex_lock(&dev->mt76.mutex);
 
-	mvif->idx = ffs(~dev->mt76.vif_mask) - 1;
+	mvif->idx = __ffs64(~dev->mt76.vif_mask);
 	if (mvif->idx >= MT7603_MAX_INTERFACES) {
 		ret = -ENOSPC;
 		goto out;
@@ -65,7 +65,7 @@ mt7603_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 	}
 
 	idx = MT7603_WTBL_RESERVED - 1 - mvif->idx;
-	dev->mt76.vif_mask |= BIT(mvif->idx);
+	dev->mt76.vif_mask |= BIT_ULL(mvif->idx);
 	INIT_LIST_HEAD(&mvif->sta.poll_list);
 	mvif->sta.wcid.idx = idx;
 	mvif->sta.wcid.hw_key_idx = -1;
@@ -106,7 +106,7 @@ mt7603_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 	spin_unlock_bh(&dev->sta_poll_lock);
 
 	mutex_lock(&dev->mt76.mutex);
-	dev->mt76.vif_mask &= ~BIT(mvif->idx);
+	dev->mt76.vif_mask &= ~BIT_ULL(mvif->idx);
 	mutex_unlock(&dev->mt76.mutex);
 
 	mt76_packet_id_flush(&dev->mt76, &mvif->sta.wcid);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/main.c b/drivers/net/wireless/mediatek/mt76/mt7615/main.c
index d79cbdbd5a05..1fd88a0f03a1 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/main.c
@@ -194,7 +194,7 @@ static int mt7615_add_interface(struct ieee80211_hw *hw,
 	    is_zero_ether_addr(vif->addr))
 		phy->monitor_vif = vif;
 
-	mvif->mt76.idx = ffs(~dev->mt76.vif_mask) - 1;
+	mvif->mt76.idx = __ffs64(~dev->mt76.vif_mask);
 	if (mvif->mt76.idx >= MT7615_MAX_INTERFACES) {
 		ret = -ENOSPC;
 		goto out;
@@ -212,7 +212,7 @@ static int mt7615_add_interface(struct ieee80211_hw *hw,
 	if (ext_phy)
 		mvif->mt76.wmm_idx += 2;
 
-	dev->mt76.vif_mask |= BIT(mvif->mt76.idx);
+	dev->mt76.vif_mask |= BIT_ULL(mvif->mt76.idx);
 	dev->omac_mask |= BIT_ULL(mvif->mt76.omac_idx);
 	phy->omac_mask |= BIT_ULL(mvif->mt76.omac_idx);
 
@@ -268,7 +268,7 @@ static void mt7615_remove_interface(struct ieee80211_hw *hw,
 
 	rcu_assign_pointer(dev->mt76.wcid[idx], NULL);
 
-	dev->mt76.vif_mask &= ~BIT(mvif->mt76.idx);
+	dev->mt76.vif_mask &= ~BIT_ULL(mvif->mt76.idx);
 	dev->omac_mask &= ~BIT_ULL(mvif->mt76.omac_idx);
 	phy->omac_mask &= ~BIT_ULL(mvif->mt76.omac_idx);
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
index dd30f537676d..32f1fe3e1d15 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_util.c
@@ -327,11 +327,11 @@ mt76x02_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 		idx += 8;
 
 	/* vif is already set or idx is 8 for AP/Mesh/... */
-	if (dev->mt76.vif_mask & BIT(idx) ||
+	if (dev->mt76.vif_mask & BIT_ULL(idx) ||
 	    (vif->type != NL80211_IFTYPE_STATION && idx > 7))
 		return -EBUSY;
 
-	dev->mt76.vif_mask |= BIT(idx);
+	dev->mt76.vif_mask |= BIT_ULL(idx);
 
 	mt76x02_vif_init(dev, vif, idx);
 	return 0;
@@ -344,7 +344,7 @@ void mt76x02_remove_interface(struct ieee80211_hw *hw,
 	struct mt76x02_dev *dev = hw->priv;
 	struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
 
-	dev->mt76.vif_mask &= ~BIT(mvif->idx);
+	dev->mt76.vif_mask &= ~BIT_ULL(mvif->idx);
 	mt76_packet_id_flush(&dev->mt76, &mvif->group_wcid);
 }
 EXPORT_SYMBOL_GPL(mt76x02_remove_interface);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/main.c b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
index c3f44d801e7f..edfb5428796a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
@@ -204,8 +204,8 @@ static int mt7915_add_interface(struct ieee80211_hw *hw,
 	    is_zero_ether_addr(vif->addr))
 		phy->monitor_vif = vif;
 
-	mvif->mt76.idx = ffs(~dev->mt76.vif_mask) - 1;
-	if (mvif->mt76.idx >= MT7915_MAX_INTERFACES) {
+	mvif->mt76.idx = __ffs64(~dev->mt76.vif_mask);
+	if (mvif->mt76.idx >= (MT7915_MAX_INTERFACES << dev->dbdc_support)) {
 		ret = -ENOSPC;
 		goto out;
 	}
@@ -227,7 +227,7 @@ static int mt7915_add_interface(struct ieee80211_hw *hw,
 	if (ret)
 		goto out;
 
-	dev->mt76.vif_mask |= BIT(mvif->mt76.idx);
+	dev->mt76.vif_mask |= BIT_ULL(mvif->mt76.idx);
 	phy->omac_mask |= BIT_ULL(mvif->mt76.omac_idx);
 
 	idx = MT7915_WTBL_RESERVED - mvif->mt76.idx;
@@ -290,7 +290,7 @@ static void mt7915_remove_interface(struct ieee80211_hw *hw,
 	rcu_assign_pointer(dev->mt76.wcid[idx], NULL);
 
 	mutex_lock(&dev->mt76.mutex);
-	dev->mt76.vif_mask &= ~BIT(mvif->mt76.idx);
+	dev->mt76.vif_mask &= ~BIT_ULL(mvif->mt76.idx);
 	phy->omac_mask &= ~BIT_ULL(mvif->mt76.omac_idx);
 	mutex_unlock(&dev->mt76.mutex);
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 3a16a966d9d3..e383168ba124 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -294,7 +294,7 @@ static int mt7921_add_interface(struct ieee80211_hw *hw,
 
 	mt7921_mutex_acquire(dev);
 
-	mvif->mt76.idx = ffs(~dev->mt76.vif_mask) - 1;
+	mvif->mt76.idx = __ffs64(~dev->mt76.vif_mask);
 	if (mvif->mt76.idx >= MT7921_MAX_INTERFACES) {
 		ret = -ENOSPC;
 		goto out;
@@ -310,7 +310,7 @@ static int mt7921_add_interface(struct ieee80211_hw *hw,
 	if (ret)
 		goto out;
 
-	dev->mt76.vif_mask |= BIT(mvif->mt76.idx);
+	dev->mt76.vif_mask |= BIT_ULL(mvif->mt76.idx);
 	phy->omac_mask |= BIT_ULL(mvif->mt76.omac_idx);
 
 	idx = MT7921_WTBL_RESERVED - mvif->mt76.idx;
@@ -354,7 +354,7 @@ static void mt7921_remove_interface(struct ieee80211_hw *hw,
 
 	rcu_assign_pointer(dev->mt76.wcid[idx], NULL);
 
-	dev->mt76.vif_mask &= ~BIT(mvif->mt76.idx);
+	dev->mt76.vif_mask &= ~BIT_ULL(mvif->mt76.idx);
 	phy->omac_mask &= ~BIT_ULL(mvif->mt76.omac_idx);
 	mt7921_mutex_release(dev);
 
