wifi: mt76: remove unused error path in mt76_connac_tx_complete_skb

The error handling code was added in order to allow tx enqueue to fail after
calling .tx_prepare_skb. Since this can no longer happen, the error handling
code is unused.
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/dma.c

@@ -330,9 +330,6 @@ mt76_dma_tx_cleanup_idx(struct mt76_dev *dev, struct mt76_queue *q, int idx,
 	if (e->txwi == DMA_DUMMY_DATA)
 		e->txwi = NULL;
 
-	if (e->skb == DMA_DUMMY_DATA)
-		e->skb = NULL;
-
 	*prev_e = *e;
 	memset(e, 0, sizeof(*e));
 }

drivers/net/wireless/mediatek/mt76/mt7615/pci_mac.c

@@ -106,7 +106,7 @@ int mt7615_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 	else
 		mt76_connac_write_hw_txp(mdev, tx_info, txp, id);
 
-	tx_info->skb = DMA_DUMMY_DATA;
+	tx_info->skb = NULL;
 
 	return 0;
 }

drivers/net/wireless/mediatek/mt76/mt76_connac_mac.c

@@ -151,23 +151,6 @@ void mt76_connac_tx_complete_skb(struct mt76_dev *mdev,
 		return;
 	}
 
-	/* error path */
-	if (e->skb == DMA_DUMMY_DATA) {
-		struct mt76_connac_txp_common *txp;
-		struct mt76_txwi_cache *t;
-		u16 token;
-
-		txp = mt76_connac_txwi_to_txp(mdev, e->txwi);
-		if (is_mt76_fw_txp(mdev))
-			token = le16_to_cpu(txp->fw.token);
-		else
-			token = le16_to_cpu(txp->hw.msdu_id[0]) &
-				~MT_MSDU_ID_VALID;
-
-		t = mt76_token_put(mdev, token);
-		e->skb = t ? t->skb : NULL;
-	}
-
 	if (e->skb)
 		mt76_tx_complete_skb(mdev, e->wcid, e->skb);
 }

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

@@ -809,7 +809,7 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 		txp->rept_wds_wcid = cpu_to_le16(wcid->idx);
 	else
 		txp->rept_wds_wcid = cpu_to_le16(0x3ff);
-	tx_info->skb = DMA_DUMMY_DATA;
+	tx_info->skb = NULL;
 
 	/* pass partial skb header to fw */
 	tx_info->buf[1].len = MT_CT_PARSE_LEN;

drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c

@@ -48,7 +48,7 @@ int mt7921e_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 	memset(txp, 0, sizeof(struct mt76_connac_hw_txp));
 	mt76_connac_write_hw_txp(mdev, tx_info, txp, id);
 
-	tx_info->skb = DMA_DUMMY_DATA;
+	tx_info->skb = NULL;
 
 	return 0;
 }

drivers/net/wireless/mediatek/mt76/mt7996/mac.c

@@ -995,7 +995,7 @@ int mt7996_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 		txp->fw.rept_wds_wcid = cpu_to_le16(wcid->idx);
 	else
 		txp->fw.rept_wds_wcid = cpu_to_le16(0xfff);
-	tx_info->skb = DMA_DUMMY_DATA;
+	tx_info->skb = NULL;
 
 	/* pass partial skb header to fw */
 	tx_info->buf[1].len = MT_CT_PARSE_LEN;