[PATCH net v3 2/3] net: airoha: Move entries to queue head in case of DMA mapping failure in airoha_dev_xmit()

[Lorenzo Bianconi]

In order to respect the original descriptor order and avoid any
potential IOMMU fault or memory corruption, move pending queue entries
to the head of hw queue tx_list if the DMA mapping of current inflight
packet fails in airoha_dev_xmit routine.

Fixes: 3f47e67dff1f7 ("net: airoha: Add the capability to consume out-of-order DMA tx descriptors")
Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
 drivers/net/ethernet/airoha/airoha_eth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
index 690bfaf8d7d9..dfe8a0bd2abd 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.c
+++ b/drivers/net/ethernet/airoha/airoha_eth.c
@@ -2053,7 +2053,7 @@ static netdev_tx_t airoha_dev_xmit(struct sk_buff *skb,
 		dma_unmap_single(dev->dev.parent, e->dma_addr, e->dma_len,
 				 DMA_TO_DEVICE);
 		e->dma_addr = 0;
-		list_move_tail(&e->list, &q->tx_list);
+		list_move(&e->list, &q->tx_list);
 	}
 
 	spin_unlock_bh(&q->lock);

-- 
2.53.0