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dpaa2-eth: unmap the SGT buffer before accessing its contents

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DMA unmap the Scatter/Gather table before going through the array to
unmap and free each of the header and data chunks. This is so we do not
touch the data between the dma_map and dma_unmap calls.

Fixes: 3dc709e0cd ("dpaa2-eth: add support for software TSO")
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ioana Ciornei 2022-05-22 15:52:51 +03:00 committed by David S. Miller
parent d5f4e19a85
commit 0a09c5b8cb
1 changed files with 4 additions and 4 deletions
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8
drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
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@ -1136,6 +1136,10 @@ static void dpaa2_eth_free_tx_fd(struct dpaa2_eth_priv *priv,
sgt = (struct dpaa2_sg_entry *)(buffer_start +
priv->tx_data_offset);
/* Unmap the SGT buffer */
dma_unmap_single(dev, fd_addr, swa->tso.sgt_size,
DMA_BIDIRECTIONAL);
/* Unmap and free the header */
tso_hdr = dpaa2_iova_to_virt(priv->iommu_domain, dpaa2_sg_get_addr(sgt));
dma_unmap_single(dev, dpaa2_sg_get_addr(sgt), TSO_HEADER_SIZE,
@ -1147,10 +1151,6 @@ static void dpaa2_eth_free_tx_fd(struct dpaa2_eth_priv *priv,
dma_unmap_single(dev, dpaa2_sg_get_addr(&sgt[i]),
dpaa2_sg_get_len(&sgt[i]), DMA_TO_DEVICE);
/* Unmap the SGT buffer */
dma_unmap_single(dev, fd_addr, swa->tso.sgt_size,
DMA_BIDIRECTIONAL);
if (!swa->tso.is_last_fd)
should_free_skb = 0;
} else {