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mlx4: fix DMA mapping leak when allocation fails

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mlx4_en_prepare_rx_desc does not correctly clean up after it finds an
allocation failure. It should unmap a page before calling put_page, but
it only calls the later.

This bug would prevent a device removal using hotplug after setting the
device MTU to 9000 and opening the network interface. After the fix, we
still see the allocation failure with MTU 9000, but we are able to
remove the device.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thadeu Lima de Souza Cascardo 2012-02-06 08:39:50 +00:00 committed by David S. Miller
parent 68355f7113
commit 7e2eb99cc6
1 changed files with 5 additions and 1 deletions
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6
drivers/net/ethernet/mellanox/mlx4/en_rx.c
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@ -168,8 +168,12 @@ static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
return 0;
err:
while (i--)
while (i--) {
dma_addr_t dma = be64_to_cpu(rx_desc->data[i].addr);
pci_unmap_single(priv->mdev->pdev, dma, skb_frags[i].size,
PCI_DMA_FROMDEVICE);
put_page(skb_frags[i].page);
}
return -ENOMEM;
}