netdev - [PATCH net-next V2 15/16] net: fec: call dma_unmap

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Message-Id: <1456360619-24390-16-git-send-email-troy.kisky@boundarydevices.com>
Date:	Wed, 24 Feb 2016 17:36:58 -0700
From:	Troy Kisky <troy.kisky@...ndarydevices.com>
To:	netdev@...r.kernel.org, davem@...emloft.net, B38611@...escale.com
Cc:	fabio.estevam@...escale.com, l.stach@...gutronix.de,
	andrew@...n.ch, tremyfr@...il.com, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org, laci@...ndarydevices.com,
	shawnguo@...nel.org, johannes@...solutions.net,
	stillcompiling@...il.com, sergei.shtylyov@...entembedded.com,
	arnd@...db.de, Troy Kisky <troy.kisky@...ndarydevices.com>
Subject: [PATCH net-next V2 15/16] net: fec: call dma_unmap_single on mapped tx buffers at restart

Make sure any pending tx buffers are unmapped when the
fec is restarted.

Signed-off-by: Troy Kisky <troy.kisky@...ndarydevices.com>
---
 drivers/net/ethernet/freescale/fec_main.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 8711196..1d71b2e 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -404,6 +404,7 @@ dma_mapping_error:
 		bdp = fec_enet_get_nextdesc(bdp, &txq->bd);
 		dma_unmap_single(&fep->pdev->dev, fec32_to_cpu(bdp->cbd_bufaddr),
 				 fec16_to_cpu(bdp->cbd_datlen), DMA_TO_DEVICE);
+		bdp->cbd_bufaddr = cpu_to_fec32(0);
 	}
 	return ERR_PTR(-ENOMEM);
 }
@@ -761,11 +762,18 @@ static void reset_tx_queue(struct fec_enet_private *fep,
 	txq->bd.cur = bdp;
 	for (i = 0; i < txq->bd.ring_size; i++) {
 		/* Initialize the BD for every fragment in the page. */
+		if (bdp->cbd_bufaddr) {
+			if (!IS_TSO_HEADER(txq, fec32_to_cpu(bdp->cbd_bufaddr)))
+				dma_unmap_single(&fep->pdev->dev,
+						 fec32_to_cpu(bdp->cbd_bufaddr),
+						 fec16_to_cpu(bdp->cbd_datlen),
+						 DMA_TO_DEVICE);
+			bdp->cbd_bufaddr = cpu_to_fec32(0);
+		}
 		if (txq->tx_skbuff[i]) {
 			dev_kfree_skb_any(txq->tx_skbuff[i]);
 			txq->tx_skbuff[i] = NULL;
 		}
-		bdp->cbd_bufaddr = cpu_to_fec32(0);
 		bdp->cbd_sc = cpu_to_fec16((bdp == txq->bd.last) ?
 					   BD_SC_WRAP : 0);
 		bdp = fec_enet_get_nextdesc(bdp, &txq->bd);
@@ -2647,6 +2655,7 @@ static void fec_enet_free_buffers(struct net_device *ndev)
 						 fec32_to_cpu(bdp->cbd_bufaddr),
 						 FEC_ENET_RX_FRSIZE - fep->rx_align,
 						 DMA_FROM_DEVICE);
+				bdp->cbd_bufaddr = cpu_to_fec32(0);
 				dev_kfree_skb(skb);
 			}
 			bdp = fec_enet_get_nextdesc(bdp, &rxq->bd);
-- 
2.5.0