mt76: mt7915: rely on mt76_connac_tx_free

As for mt7921 and mt7615 drivers, rely on mt76_connac_tx_free data
structure in mt7915e driver.
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76_connac.h

@@ -146,8 +146,7 @@ struct mt76_connac_txp_common {
 struct mt76_connac_tx_free {
 	__le16 rx_byte_cnt;
 	__le16 ctrl;
-	u8 txd_cnt;
-	u8 rsv[3];
+	__le32 txd;
 } __packed __aligned(4);
 
 extern const struct wiphy_wowlan_support mt76_connac_wowlan_support;

drivers/net/wireless/mediatek/mt76/mt7915/mac.c

@@ -884,7 +884,8 @@ mt7915_mac_tx_free_done(struct mt7915_dev *dev,
 static void
 mt7915_mac_tx_free(struct mt7915_dev *dev, void *data, int len)
 {
-	struct mt7915_tx_free *free = (struct mt7915_tx_free *)data;
+	struct mt76_connac_tx_free *free = data;
+	__le32 *tx_info = (__le32 *)(data + sizeof(*free));
 	struct mt76_dev *mdev = &dev->mt76;
 	struct mt76_txwi_cache *txwi;
 	struct ieee80211_sta *sta = NULL;
@@ -899,10 +900,10 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, void *data, int len)
 
 	total = le16_get_bits(free->ctrl, MT_TX_FREE_MSDU_CNT);
 	v3 = (FIELD_GET(MT_TX_FREE_VER, txd) == 0x4);
-	if (WARN_ON_ONCE((void *)&free->info[total >> v3] > end))
+	if (WARN_ON_ONCE((void *)&tx_info[total >> v3] > end))
 		return;
 
-	for (cur_info = &free->info[0]; count < total; cur_info++) {
+	for (cur_info = tx_info; count < total; cur_info++) {
 		u32 msdu, info = le32_to_cpu(*cur_info);
 		u8 i;
 
@@ -955,9 +956,9 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, void *data, int len)
 static void
 mt7915_mac_tx_free_v0(struct mt7915_dev *dev, void *data, int len)
 {
-	struct mt7915_tx_free *free = (struct mt7915_tx_free *)data;
+	struct mt76_connac_tx_free *free = data;
+	__le16 *info = (__le16 *)(data + sizeof(*free));
 	struct mt76_dev *mdev = &dev->mt76;
-	__le16 *info = (__le16 *)free->info;
 	void *end = data + len;
 	LIST_HEAD(free_list);
 	bool wake = false;

drivers/net/wireless/mediatek/mt76/mt7915/mac.h

@@ -41,14 +41,6 @@ enum tx_mcu_port_q_idx {
 	MT_TX_MCU_PORT_RX_Q3,
 	MT_TX_MCU_PORT_RX_FWDL = 0x3e
 };
-
-struct mt7915_tx_free {
-	__le16 rx_byte_cnt;
-	__le16 ctrl;
-	__le32 txd;
-	__le32 info[];
-} __packed __aligned(4);
-
 #define MT_TX_FREE_VER			GENMASK(18, 16)
 #define MT_TX_FREE_MSDU_CNT		GENMASK(9, 0)
 #define MT_TX_FREE_MSDU_CNT_V0	GENMASK(6, 0)