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via-velocity: Correct 64-byte alignment for rx buffers

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(From the VIA driver). The current code does not guarantee 64-byte
alignment since it simply does

        int add = skb->data & 63;

        skb->data += add;

(via skb_reserve). So for example, if the skb->data address would be
0x10, this would result in 32-byte alignment (0x10 + 0x10).

Correct by adding

        64 - (skb->data & 63)

instead.

Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Simon Kagstrom 2009-11-25 22:09:53 +00:00 committed by David S. Miller
parent 350f75960c
commit da95b2d422
1 changed files with 2 additions and 1 deletions
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3
drivers/net/via-velocity.c
View file

@ -1470,7 +1470,8 @@ static int velocity_alloc_rx_buf(struct velocity_info *vptr, int idx)
* Do the gymnastics to get the buffer head for data at
* 64byte alignment.
*/
skb_reserve(rd_info->skb, (unsigned long) rd_info->skb->data & 63);
skb_reserve(rd_info->skb,
64 - ((unsigned long) rd_info->skb->data & 63));
rd_info->skb_dma = pci_map_single(vptr->pdev, rd_info->skb->data,
vptr->rx.buf_sz, PCI_DMA_FROMDEVICE);