From fc75ba5159a63fad40442b9a9527a0f9b06de79b Mon Sep 17 00:00:00 2001 From: Troy Kisky Date: Fri, 5 Feb 2016 14:52:50 -0700 Subject: [PATCH] net: fec: improve error handling Unmap initial buffer on error. Don't free skb until it has been unmapped. Move cbd_bufaddr assignment closer to the mapping function. Signed-off-by: Troy Kisky Signed-off-by: David S. Miller --- drivers/net/ethernet/freescale/fec_main.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 97ca72a6aaf4..ef18ca501f9e 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -382,7 +382,6 @@ fec_enet_txq_submit_frag_skb(struct fec_enet_priv_tx_q *txq, addr = dma_map_single(&fep->pdev->dev, bufaddr, frag_len, DMA_TO_DEVICE); if (dma_mapping_error(&fep->pdev->dev, addr)) { - dev_kfree_skb_any(skb); if (net_ratelimit()) netdev_err(ndev, "Tx DMA memory map failed\n"); goto dma_mapping_error; @@ -467,8 +466,12 @@ static int fec_enet_txq_submit_skb(struct fec_enet_priv_tx_q *txq, if (nr_frags) { last_bdp = fec_enet_txq_submit_frag_skb(txq, skb, ndev); - if (IS_ERR(last_bdp)) + if (IS_ERR(last_bdp)) { + dma_unmap_single(&fep->pdev->dev, addr, + buflen, DMA_TO_DEVICE); + dev_kfree_skb_any(skb); return NETDEV_TX_OK; + } } else { status |= (BD_ENET_TX_INTR | BD_ENET_TX_LAST); if (fep->bufdesc_ex) { @@ -478,6 +481,8 @@ static int fec_enet_txq_submit_skb(struct fec_enet_priv_tx_q *txq, estatus |= BD_ENET_TX_TS; } } + bdp->cbd_bufaddr = cpu_to_fec32(addr); + bdp->cbd_datlen = cpu_to_fec16(buflen); if (fep->bufdesc_ex) { @@ -501,8 +506,6 @@ static int fec_enet_txq_submit_skb(struct fec_enet_priv_tx_q *txq, /* Save skb pointer */ txq->tx_skbuff[index] = skb; - bdp->cbd_datlen = cpu_to_fec16(buflen); - bdp->cbd_bufaddr = cpu_to_fec32(addr); /* Make sure the updates to rest of the descriptor are performed before * transferring ownership. */ -- 2.39.5