mirror of https://gitee.com/openkylin/linux.git
sh_eth: Check for DMA mapping errors on transmit
dma_map_single() may fail if an IOMMU or swiotlb is in use, so we need to check for this. Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -2174,6 +2174,10 @@ static int sh_eth_start_xmit(struct sk_buff *skb, struct net_device *ndev)
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skb->len + 2);
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txdesc->addr = dma_map_single(&ndev->dev, skb->data, skb->len,
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DMA_TO_DEVICE);
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if (dma_mapping_error(&ndev->dev, txdesc->addr)) {
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kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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txdesc->buffer_length = skb->len;
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if (entry >= mdp->num_tx_ring - 1)
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