[PATCH net-next V2 8/8] net: fec: improve error handling

[Troy Kisky]

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 <troy.ki...@boundarydevices.com>
---
 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