via-velocity: Correct 64-byte alignment for rx buffers
(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>
diff --git a/drivers/net/via-velocity.c b/drivers/net/via-velocity.c
index 1e6b395..04d3836 100644
--- a/drivers/net/via-velocity.c
+++ b/drivers/net/via-velocity.c
@@ -1470,7 +1470,8 @@
* 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);