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authorNathan Hintz <nlhintz@hotmail.com>2013-10-29 19:32:01 -0700
committerDavid S. Miller <davem@davemloft.net>2013-10-29 22:59:19 -0400
commitb757a62e9f0df5c997c666dca4ad81197b5d8917 (patch)
tree9d5eea9809b64db417adbb5b4d375b1b6722f128
parent32663b8b8948cc05f812ab82c1c7db2db3ddf717 (diff)
downloadlinux-b757a62e9f0df5c997c666dca4ad81197b5d8917.tar.bz2
bgmac: don't update slot on skb alloc/dma mapping error
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>
-rw-r--r--drivers/net/ethernet/broadcom/bgmac.c20
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index 249468f95365..9e8a3e024e01 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -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");