From mboxrd@z Thu Jan 1 00:00:00 1970 From: Troy Kisky Subject: [PATCH net-next V2 8/8] net: fec: improve error handling Date: Fri, 5 Feb 2016 14:52:50 -0700 Message-ID: <1454709170-19527-9-git-send-email-troy.kisky@boundarydevices.com> References: <1454709170-19527-1-git-send-email-troy.kisky@boundarydevices.com> Cc: fabio.estevam@freescale.com, l.stach@pengutronix.de, andrew@lunn.ch, tremyfr@gmail.com, linux@arm.linux.org.uk, linux-arm-kernel@lists.infradead.org, laci@boundarydevices.com, shawnguo@kernel.org, johannes@sipsolutions.net, arnd@arndb.de, Troy Kisky To: netdev@vger.kernel.org, davem@davemloft.net, B38611@freescale.com Return-path: Received: from mail-pf0-f178.google.com ([209.85.192.178]:32892 "EHLO mail-pf0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751451AbcBEVzS (ORCPT ); Fri, 5 Feb 2016 16:55:18 -0500 Received: by mail-pf0-f178.google.com with SMTP id w123so75569187pfb.0 for ; Fri, 05 Feb 2016 13:55:18 -0800 (PST) In-Reply-To: <1454709170-19527-1-git-send-email-troy.kisky@boundarydevices.com> Sender: netdev-owner@vger.kernel.org List-ID: 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 --- 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 97ca72a..ef18ca5 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. */ -- 2.5.0