From b757a62e9f0df5c997c666dca4ad81197b5d8917 Mon Sep 17 00:00:00 2001 From: Nathan Hintz Date: Tue, 29 Oct 2013 19:32:01 -0700 Subject: [PATCH] bgmac: don't update slot on skb alloc/dma mapping error MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Acked-by: Rafał Miłecki Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bgmac.c | 20 ++++++++++++++------ 1 file 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"); -- 2.30.2