net: dont use __netdev_alloc_skb for bounce buffer

commit a1c7fff7e1 (net: netdev_alloc_skb() use build_skb()) broke b44 on
some 64bit machines.

It appears b44 and b43 use __netdev_alloc_skb() instead of alloc_skb()
for their bounce buffers.

There is no need to add an extra NET_SKB_PAD reservation for bounce
buffers :

- In TX path, NET_SKB_PAD is useless

- In RX path in b44, we force a copy of incoming frames if
  GFP_DMA allocations were needed.

Reported-and-bisected-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/b44.c b/drivers/net/ethernet/broadcom/b44.c
index 46b8b7d..d09c6b5 100644 (file)
--- a/drivers/net/ethernet/broadcom/b44.c
+++ b/drivers/net/ethernet/broadcom/b44.c
@@ -656,7 +656,7 @@ static int b44_alloc_rx_skb(struct b44 *bp, int src_idx, u32 dest_idx_unmasked)
                        dma_unmap_single(bp->sdev->dma_dev, mapping,
                                             RX_PKT_BUF_SZ, DMA_FROM_DEVICE);
                dev_kfree_skb_any(skb);
-               skb = __netdev_alloc_skb(bp->dev, RX_PKT_BUF_SZ, GFP_ATOMIC|GFP_DMA);
+               skb = alloc_skb(RX_PKT_BUF_SZ, GFP_ATOMIC | GFP_DMA);
                if (skb == NULL)
                        return -ENOMEM;
                mapping = dma_map_single(bp->sdev->dma_dev, skb->data,
@@ -967,7 +967,7 @@ static netdev_tx_t b44_start_xmit(struct sk_buff *skb, struct net_device *dev)
                        dma_unmap_single(bp->sdev->dma_dev, mapping, len,
                                             DMA_TO_DEVICE);
 
-               bounce_skb = __netdev_alloc_skb(dev, len, GFP_ATOMIC | GFP_DMA);
+               bounce_skb = alloc_skb(len, GFP_ATOMIC | GFP_DMA);
                if (!bounce_skb)
                        goto err_out;
 

diff --git a/drivers/net/wireless/b43legacy/dma.c b/drivers/net/wireless/b43legacy/dma.c
index f1f8bd0..c8baf02 100644 (file)
--- a/drivers/net/wireless/b43legacy/dma.c
+++ b/drivers/net/wireless/b43legacy/dma.c
@@ -1072,7 +1072,7 @@ static int dma_tx_fragment(struct b43legacy_dmaring *ring,
        meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
        /* create a bounce buffer in zone_dma on mapping failure. */
        if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) {
-               bounce_skb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
+               bounce_skb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
                if (!bounce_skb) {
                        ring->current_slot = old_top_slot;
                        ring->used_slots = old_used_slots;