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bgmac: don't update slot on skb alloc/dma mapping error

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Don't update the slot in "bgmac_dma_rx_skb_for_slot" unless both the
skb alloc and dma mapping are successful; and free the newly allocated
skb if a dma mapping error occurs.  This relieves the caller of the need
to deduce/execute the appropriate cleanup action required when an error
occurs.

Signed-off-by: Nathan Hintz <nlhintz@hotmail.com>
Acked-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nathan Hintz 2013-10-29 19:32:01 -07:00 committed by David S. Miller
parent 32663b8b89
commit b757a62e9f
1 changed files with 14 additions and 6 deletions
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20
drivers/net/ethernet/broadcom/bgmac.c
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@ -244,25 +244,33 @@ static int bgmac_dma_rx_skb_for_slot(struct bgmac *bgmac,
struct bgmac_slot_info *slot)
{
struct device *dma_dev = bgmac->core->dma_dev;
struct sk_buff *skb;
dma_addr_t dma_addr;
struct bgmac_rx_header *rx;
/* Alloc skb */
slot->skb = netdev_alloc_skb(bgmac->net_dev, BGMAC_RX_BUF_SIZE);
if (!slot->skb)
skb = netdev_alloc_skb(bgmac->net_dev, BGMAC_RX_BUF_SIZE);
if (!skb)
return -ENOMEM;
/* Poison - if everything goes fine, hardware will overwrite it */
rx = (struct bgmac_rx_header *)slot->skb->data;
rx = (struct bgmac_rx_header *)skb->data;
rx->len = cpu_to_le16(0xdead);
rx->flags = cpu_to_le16(0xbeef);
/* Map skb for the DMA */
slot->dma_addr = dma_map_single(dma_dev, slot->skb->data,
BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
if (dma_mapping_error(dma_dev, slot->dma_addr)) {
dma_addr = dma_map_single(dma_dev, skb->data,
BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
if (dma_mapping_error(dma_dev, dma_addr)) {
bgmac_err(bgmac, "DMA mapping error\n");
dev_kfree_skb(skb);
return -ENOMEM;
}
/* Update the slot */
slot->skb = skb;
slot->dma_addr = dma_addr;
if (slot->dma_addr & 0xC0000000)
bgmac_warn(bgmac, "DMA address using 0xC0000000 bit(s), it may need translation trick\n");