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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>
This commit is contained in:
Ben Hutchings 2015-01-27 00:49:47 +00:00 committed by David S. Miller
parent 740c7f31c0
commit aa3933b873
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/renesas/sh_eth.c
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@ -2174,6 +2174,10 @@ static int sh_eth_start_xmit(struct sk_buff *skb, struct net_device *ndev)
skb->len + 2);
txdesc->addr = dma_map_single(&ndev->dev, skb->data, skb->len,
DMA_TO_DEVICE);
if (dma_mapping_error(&ndev->dev, txdesc->addr)) {
kfree_skb(skb);
return NETDEV_TX_OK;
}
txdesc->buffer_length = skb->len;
if (entry >= mdp->num_tx_ring - 1)