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authorSimon Kagstrom <simon.kagstrom@netinsight.net>2009-11-25 22:09:53 +0000
committerDavid S. Miller <davem@davemloft.net>2009-11-26 15:51:06 -0800
commitda95b2d422b6eb2b76789bbdbfafb7e07c493e7a (patch)
tree7ca2d1d0115d34364a7bc8c7ad558d3c5246f7be /drivers/net/via-velocity.c
parent350f75960c8ba317935b4274c56c16412e085b08 (diff)
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>
Diffstat (limited to 'drivers/net/via-velocity.c')
-rw-r--r--drivers/net/via-velocity.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/via-velocity.c b/drivers/net/via-velocity.c
index 1e6b395c555f..04d3836bfa5d 100644
--- a/drivers/net/via-velocity.c
+++ b/drivers/net/via-velocity.c
@@ -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);