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net: airoha: Move entries to queue head in case of DMA mapping failure in airoha_dev_xmit()

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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: 3f47e67dff ("net: airoha: Add the capability to consume out-of-order DMA tx descriptors")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20260429-airoha-xmit-unmap-error-path-v2-1-32e43b7c6d25@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Lorenzo Bianconi
2026-04-29 14:02:31 +02:00
committed by Jakub Kicinski
parent 7a33345153
commit 75df490c9e
1 changed files with 2 additions and 4 deletions
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6
drivers/net/ethernet/airoha/airoha_eth.c
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@@ -2120,14 +2120,12 @@ static netdev_tx_t airoha_dev_xmit(struct sk_buff *skb,
return NETDEV_TX_OK;
error_unmap:
while (!list_empty(&tx_list)) {
e = list_first_entry(&tx_list, struct airoha_queue_entry,
list);
list_for_each_entry(e, &tx_list, list) {
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_splice(&tx_list, &q->tx_list);
spin_unlock_bh(&q->lock);
error: